Monsters in the Goosebumps franchise

The following is a list of monsters and villains that have appeared in the Goosebumps franchise in alphabetical order.

A

 * Abigail : A porcelain doll that came to life on accident by the incantation spell for the dummy. She'd appeared in a Goosebumps SlappyWorld book called Slappy Birthday to You.
 * Abominable Snowman: A mysterious creature from the highest mountains in Alaska. The creature itself is harmless, (save for a rabid appetite for trail mix) but the snow that comes from its habitat has the ability to freeze objects instantly. It appeared in the Goosebumps book, The Abominable Snowman of Pasadena.
 * Ahmed: A quiet Egyptian dressed all in white with a red handkerchief and a ponytail, he is a descendant of the ancient Priestess Khala. His duty is to keep all people away from his tomb. He punishes the invaders of his tomb by mummifying them alive. He appeared in the Goosebumps book, The Curse of the Mummy's Tomb.
 * Aldebaranians: An alien race who resembled humans, with purple fur and meter-long arms. An Aldebaranian appeared and saved the reader from the blobs, and he declared that his race has nothing to do with the Vegans and the Arcturans, and he was heading toward Earth, which delighted the reader. However, he then revealed that they will arrive on Earth in a while, which is three thousands of your (reader's) years. His kind appeared in the Give Yourself Goosebumps book, Zapped in Space.
 * Alien Lobsters: A type of alien race from outer space. They're about the size of a cow, their skin was a mucus-green color, they had giant, mushed-in heads with big, glittery eyes, a bunch of tentacles all over their heads where their hair should be, they walked on six legs, two arms grew out of their backs, and instead of hands, they have giant claws. They used these TV signals to hypnotized anyone who watches TV. They appeared in a short story called You Gotta Believe Me!
 * Alien Pig Mask: A furry, pig-face mask with curled yellow horns poking out of the top. It appeared in The Five Masks of Dr. Screem.
 * Alien Walruses:  A race of some kind of aliens from an unknown planet that uses humans as slaves by using a bottle of grape juice called Brain Juice (hence the title of the book) that can make any human beings very smart. They wore no clothes (except for a crown because that's an emperor). They have bell-shaped bodies that are green and wet-skinned, four slender tentacles that are poking out of their sides, two flat webbed feet ( eight curled black toes on each foot) rested at the end of short stumpy legs, and frog-like heads that bobbed on top of the short, fat bodies. The aliens' faces were ugly and cruel. Two wet yellow eyes bulged over two jagged-toothed mouths. They also have these purple pods that throbbed and pulsed up and down their four tentacles plus it looks like deep wounds which they used to breathe through them. They appeared in Brain Juice.
 * Amaz-O: An evil magician who was turned into a rabbit. He appeared in the Goosebumps book, Bad Hare Day.
 * Andrew Craw: A boy that gets his head pulled off and tries to find another head. He appears in the Goosebumps book, The Headless Ghost.
 * Annabelle: A malevolent or benevolent entity who appears in a variety of forms, including as an evil witch, a good or evil ghost and even as the title of a steamboat. The one thing that they all share in common is that they all seem to have treasure in one form or another. She/it appeared in the Give Yourself Goosebumps book, Lost in Stinkeye Swamp.
 * Annalee: She's a ghost who haunts Shep Mooney. She's about the same age as Shep, has a copper-colored hair and wears an old-fashioned, dark plaid skirt that brushed the floor and a high-collared white blouse with sleeves that billowed as if blown by the wind. She'd appeared in 2018 Goosebumps SlappyWorld book called The Ghost of Slappy.
 * Annihilator 3000: A kid-sized toy robot with red lights for eyes. It has lasers in its hands and a freezer beam in its chest. It was supposed to come with plastic spacemen inside, but it was just a prototype. It starts using its lasers to destroy the reader's home. It appeared in the Give Yourself Goosebumps book Toy Terror: Batteries Included.
 * Arcturans: A highly intelligent species of alien from the planet Arcturus. They resemble floating heads inside fish bowls which come in a variety of colors, and possess strong telepathic powers. The Arcturans believe they are the most intelligent forms of life and have begun to enslave other races by force. They appeared in the Give Yourself Goosebumps book, Zapped in Space.
 * Aunt Dahlia: A witch who travels to many different places, claiming to be related to various families as a "great aunt", then ages their children to senility with special prune cookies to marry them off to her friends, including Lillian and Mimi, for a price. When Tom threw a pitcher of prune juice at her, her whole body collapsed into dust. She appeared in the short story An Old Story.
 * Axel: A flame-haired, skull-faced man who got his face removed. He works for Sybil Wicked. Despite being an antagonist for most of the book, it is possible to save him from a "De-Boner". He appears in Welcome to the Wicked Wax Museum.

B

 * Balloon Spider: It's a huge spider made out of balloons that can shoot a web to its victim. If someone pops one of its balloons it'll burst out a bunch of real spiders. It appeared in the 2018 film Goosebumps 2: Haunted Halloween.
 * The Beast: He's a real-life/video game character from the video game of the same name. He's dark and bearded, and wears a shiny armor over a purple robe. His ears stand up like wolf ears and his snout of a nose and long-toothed grin made him look more like a monster than a man. He appeared in Escape from Shudder Mansion.
 * Beasts: Enormous blue koala-like creatures that play a deadly game of tag, in which the loser is eaten. It is also apparent that the better a Beast is at playing the game, the more abilities they are able to perform. Beasts are honor bound by the rules of the game. They appeared in The Beast from the East.
 * BIAJOLs: Brains in a Jar on Legs are thirsty for knowledge. They are the enemies in the game Brain Drain; the player has to suck the BIAJOLs' brain juice before they get to the player. The BIAJOLs are from the game Goosebumps HorrorLand.
 * The Blob Monster: The Blob is a pink creature that has a mouth filled with razor sharp teeth and a long, sticky tongue. Originally an imaginary character created by Zackie Beauchamp, the Blob came to life through the power of a mysterious typewriter Zackie acquired from a burnt down antiques shop. After the Blob went on a rampage through the city, Zackie deduced that he was the one who brought it to life, through whatever power the typewriter passed into him via an electric shock. Zackie willed the Blob away and returned Adam. However, it turned out the Blob was actually the one writing the story, and a friend, another blob, suggested rewriting the ending so the Blob wins. This monster appeared in The Blob That Ate Everyone. This monster may have been a tribute to the 1958 movie The Blob and the 1988 remake of the same name.
 * Blue Kerlew Hound: A rare breed of Scottish wolfhound, the hound's fur is a dark shade of blue, and the dog has yellowish teeth that are about the size of a person's thumb. The dog brings bad luck, but its teeth can grant you an infinite amount of wishes. However, the wishes come with a price. The Blue Kerlew Hound appeared in Goosebumps HorrorLand book When the Ghost Dog Howls.
 * Body Squeezers:  Enormous green aliens, the Body Squeezers used a meteorite to visit Earth. They are able to absorb into humans by wrapping their arms around any human. They then start taking over the human bodies. After the aliens are killed, a new, blue Body Squeezer species appears. Appearing in two of the Goosebumps Series 2000 books, Invasion of the Body Squeezers Part 1 and 2, the blue species also appears in the Give Yourself Goosebumps Book Revenge of the Body Squeezers. These aliens are an obvious reference to Invasion of the Body Snatchers.
 * Brandon Estep: The Most Powerful Ghost (MPG, for short) appears in The Curse of the Creeping Coffin. He wears a motorcycle outfit and has a "literal" iron fist.
 * Bravo: A mist spirit in the form of a golden retriever. It appeared in the short story The Spirit of the Harvest Moon.
 * Brent Green: An invisible boy from My Best Friend Is Invisible.
 * Bug-People: Races of human/insect hybrids that have stick-like arms and, if the reader walks towards one, they jump similar to how a cricket leaps. They appeared in Little Comic Shop of Horrors.
 * Bugs: A terrifying race of small mites that render humans into parasitic hosts. They rule the world in an alternate universe accessible by the Transvator. Every couple of years the insects devour most of their hosts inside a massive hive. Being infested by them is described as having thousands of tiny needles poked into the host at first, until a massive euphoria sets in. These insects appeared in Elevator to Nowhere.
 * Bugsy: A hawk that is about a size of a parrot. It carries a shrinking hormone in it's saliva that can shrink anyone to about 9 inches tall. It appeared in Night of the Giant Everything.
 * The Bullet: A bald-headed, silver-costumed character who can fly low and fast as a bullet. He appears in Dr. Maniac Will See You Now.
 * Buttermilk: A large golden retriever who, thanks to Fifi, is now a vampire dog. It appeared in Please Don't Feed the Vampire!
 * Buzzard Hawks: Gigantic creatures which are bigger than swans, have black plumage with outstretched wings and have narrow heads, sharp talons, and are strong enough to carry a dog. These hawks appear in the book Planet of the Lawn Gnomes.

C

 * Camp Spirit Moon Ghosts: The ghosts of the campers and counselors who attended Camp Spirit Moon, who died when a strange fog made its way to the camp. The spirits' main goal is to leave the camp, but the only way to leave is through possessing the body of a living person. Appeared in Ghost Camp.
 * Captain Croaker: A mutant frog who has a sidekick known as Terry Tadpole. He appears in Dr. Maniac Will See You Now.
 * Captain Long Ben One-Leg: The Captain of a pirate ship that vanished behind a gray cloud. He appeared in the Goosebumps HorrorLand book, Creep from the Deep.
 * Cats: A group of undead cats brought to life via a magical pet store called "Cat Heaven". In the event a cat suffers a violent death, their owner may bring them to the store and be brought to life before taking them back home. In the event the cat should leave the house, it will relive its violent death causing it to be picked up by the Cat Heaven workers and brought back to the store to be picked up. In the event that someone other then its owner should pick it up, it will turn violent and attack randomly. They appeared in Claws!
 * Cave Spirit: A primordial spirit that represents the darkest of animal nature, he has the ability to control or possess animals and has the allegiance of many sorcerers and ghosts in Arizona. He resides within a bear skull, and when set free he will set out to imprison those who disturb his rest in the form of cave paintings. He has a variety of forms; the main one, being human form, is a powerful magician, and in animal form, he takes shape of a bear. He is the main villain in The Curse of the Cave Creatures.
 * Celeste: A black cat that knows how to talk thanks to a deceased sailor Danny. She appeared in Attack of the Jack.
 * The Cemetery Man: A man in black who appears in Escape from Camp Run-For-Your-Life. He has power over the zombies that roam Zombie Mountain, and can also transform anyone into a zombie.
 * Chair Monsters: Furry cinema chairs that are alive and once a person sits on one of these chairs it will hold him/her in place until the movie is over, also they can move in sync while the movie is playing. They'd appeared in The Streets of Panic Park.
 * Chin Chilla: A villainess who only appears in the video game Attack of the Mutant. She is the second-in-command of the Masked Mutant and was imprisoned in a comic book by Magnificent Molecule Man. She has icy blue skin, has hoses for hands that shoot snowballs, and wears a bunch of chinchillas as a coat. The Masked Mutant tricks the player into giving him the comic book and releases Chin Chilla. The player deflects the snowballs she shoots at a scoreboard, causing it to fall and shatter the ice. After Chin Chilla is swept away by the current, the player only finds one of her boots.
 * Chop Suey/Susan Chopman: A ghost of a cafeteria worker named Susan Chopman, who brandishes a meat cleaver and must be summoned by standing on your tip toes and saying "Chop Suey" three times in a row. She appeared in the short story, What's Cooking?
 * Civil War Soldier: A huge ghost who died in battle along time ago and this ghost wields a huge sword that is about 5 ft long, the handle is mother-of-pearl, encrusted with sapphires and it wears an old-fashioned uniform. It appears in The Curse of the Creeping Coffin.
 * Clarissa: A mysterious woman with the power to grant wishes, all of which come true in an unexpected way and with horrifying consequences. She appeared in the Goosebumps book, Be Careful What You Wish For...
 * Cleopatra: A big black mummified cat. This cat was black except for a tiny V of white on her chest and has olive eyes. It appeared in Who's Your Mummy?
 * Colorful Bull: An enormous red and yellow bull. It has these gleaming horn on its head that is about two feet long, and every time you make a turn while running from the bull, it split itself into three. It appeared in The Creepy Creations of Professor Shock.
 * Compton Dawes: The realtor in Dark Falls. Compton sells dead house to the recently moved in families. Compton has stated that he is the only Compton in his family so that's how Amanda and Josh found out that the tombstone that said "Compton Dawes R.I.P. 1950-1980" was his and lied about being a living person in Dark Falls. Amanda thought she saw Compton at the end of the book even though they killed him but she was unsure this could have happened to the other folks of Dark Falls. He appears in the book Welcome to Dead House.
 * Count von Smelling: A vampire that's about 10 feet tall, and has 6-inch fangs. Also if the readers try to talk to him he'll bored the reader to death with one of his long tales. He'd appeared in Please Don't Feed the Vampire!
 * Creeps: Reptilian beasts who are on a mission and believe Ricky is their Commander. They plan to put identity seeds in the school bake sale cookies to turn all the other students into Creeps. After realizing that he cannot stop them, he goes along with the plan after learning that once the other children become Creeps, Ricky will be their ruler and they will become his slaves. So he eats a cookie to become a Creep. If you can't beat them, join them. They appeared in the Goosebumps book, Calling All Creeps!
 * Cronby: A cave troll who appears in Deep in the Jungle of Doom. His one intent is to eat or enslave those who happen upon him. He asks the reader trivia questions about the Goosebumps series.
 * Cuddle Bears: The owners of a bear-themed Amusement park named Cuddle Bear Land. But the employees does not wear costumes, they are real Cuddle Bears, who use Honey Crackers to transform children in stuffed souvenir bears. They appeared in the short story, Please Don't Feed the Bears.
 * Curly the Skeleton: A skeleton who loves scary stories. Curly had no appearance in the Goosebumps books, but he became the mascot of the whole series. Curly has been illustrated on five Tales to Give You Goosebumps book covers. On most of them, Curly is seen with his pet bulldog.
 * Cyborgs: A group of machines that are part human and part robot. They appeared in The Creepy Creations of Professor Shock.
 * Cycat: A skinny orange cat that has one eye. It appeared in The Horror at Chiller House.

D

 * Danny Lubbins: The ghost of a dead sailor who wants his cat back. He's missing some skin on his forehead because you can see a square of his gray skull underneath, a bony finger, his eyes were wide and unblinking they were solid white like two eggshells, his beard were tangled and knotted, and his long, patchy hair fell to the sides of his cheeks. He wore a shirt and trousers that were drenched, tattered and nearly in shreds. He appeared in Attack of the Jack!.
 * Dare: A "Gamesmaster" from KidsCare. Dare is a slim man with a cape and tattoos all over his body, and during his dangerous games his tattoos come to life, and can separate from him. If a tattoo is destroyed, it will be unable to return to Dare's body, and the part of his body that once held that tattoo will vanish completely. He appeared in the Give Yourself Goosebumps book, Attack of the Beastly Babysitter.
 * Dark Falls Citizens: The Dark Falls Citizens died years ago because of an accident at the plastics factory which released a yellow gas over the town making them become zombie-like figures. To live the people of the town need fresh blood and make fake wills to think a family inherited a house from a dead relative. The town people normally wear hats because they will burn in the sunlight. They usually have meetings in the cemetery where there tombstones would naturally be. Amanda and Josh destroyed all the town folk when they knocked over the big tree that kept all the sunlight from getting in the meeting place. The town's folk may not be dead because Amanda thought she saw Compton Dawes (Dark Falls Realtor) at the end when she was sure she destroyed him. They appear in Welcome to Dead House.
 * Della: Formerly a camper at Camp Cold Lake, Della tried to run away from the camp through a forest nearby, but was bitten by a snake and died. She returns from the grave as a ghost, seeking to make one of the other campers become her "buddy" forever. She does so by making them think that she died drowning in a lake, scaring them away from it and instead attempting to flee via the forest, where they will die in the same way she did. She has only succeeded in this plan once; the girl who died returned from the grave in order to stop her from doing it again. She appeared in the Goosebumps book, The Curse of Camp Cold Lake.
 * The Dollmaker: An old woman that use these dolly jelly to transfer the features from a person and into her dolls. She'd appeared in the short story called Broken Dolls.
 * Dr. Aqua: Agent Z's nemesis and the main antagonist of one of the films in Invaders from the Big Screen.
 * Dr. Brewer's Clone: During an experiment to electronically combine the DNA of two different plants, Dr. Michael Brewer accidentally cut his hand on a slide and his own blood mixed with the plant DNA. The result was a plant that was part human. Excited by this new development, he continued his work, ultimately creating a plant that was nearly identical to him, but with a few differences. This plant-clone was strong enough and smart enough to overpower its creator, locking him in a closet and taking over his experiments. However, it was not perfect, being forced to sleep in dirt and eat plant food to survive. It also had leaves growing from its head and its "blood" was green. The clone was ultimately killed, cut in two by its axe-wielding creator. It appeared in the Goosebumps book, Stay Out of the Basement.
 * Dr. Crawler: A man who accidentally turns himself into a copperhead snake. He experiments on children to try to turn himself back. He appeared in the Goosebumps HorrorLand book, Welcome to Camp Slither.
 * Dr. Doof: Ballistic Bug's worst enemy, he wears black armor, goggles, and a metal face mask. He appeared in Little Comic Shop of Horrors.
 * Dr. Horror: The owner of Dr. Horror's House of Video (hence the title of the short story) which is the only place that sells horror videos. He is also a director too on how he films these horror movies with real monsters and for those who are horror fans gets to play as the victim for each of his Horror films. He appeared in one of the short stories called Dr. Horror's House of Video.
 * Dr. Mac Death: An insane entertainer who attends the reader's horror-themed birthday party. He appeared in the Give Yourself Goosebumps book, Scary Birthday to You!
 * Dr. Maniac: Robby Schwartz's webcomic supervillain. He appeared in the Goosebumps HorrorLand book, Dr. Maniac vs. Robby Schwartz and in the Goosebumps Most Wanted book, Dr. Maniac Will See You Now.
 * Dr. Root:  A huge man that is the first one out of the Comic Book world by using the trapdoor in the museum of comic books, you could say that he is "the root of evil". He has short black hair over a round red face that looked like an inflated balloon, a belly that is so enormous that the fat folds of his stomach poked out, his arms were bare and pink like to big hams, his fingers looked like sausages, he has tiny black bird eyes tucked into his head, and when he smiled at someone, folds of fat formed 3 or 4 chins under his mouth. He wears a lab coat, but since his belly is enormous two or three buttons has popped off. He appeared in Dr. Maniac Will See You Now.
 * Dr. Shreek: A robot created by Mr. Toggle. He is the piano teacher at the piano-learning school. He then tells a student, Jerry, he wants to steal his hands and chases him around until he is shut down and killed by Mr. Toggle. He was introduced in the Goosebumps book, Piano Lessons Can Be Murder.
 * Dragons: Creatures who have made appearances in a few books, such as Tick Tock, You're Dead!, The Knight in Screaming Armor, Deep in the Jungle of Doom and Be Afraid – Be Very Afraid!.
 * Dwarves: Mischievous creatures who appear in Checkout Time at the Dead-End Hotel. They enslave the reader.

E

 * Egg Monsters: Yellow monsters from Mars who look like egg yolk. They appear in the Goosebumps book, Egg Monsters from Mars.
 * Egyptian Pharaoh Ghost: A ghost who is the pharaoh of ancient Egypt. It appears in The Curse of the Creeping Coffin.
 * Elf Fisherman: A bearded elf in a brown apron holding a wide net. It appeared in Be Afraid – Be Very Afraid!.
 * El Sydney: A Mexican-themed magician. He appeared in the TV adaptation of Bad Hare Day.
 * Elvira Martin: A female ghost. Her grave has an angel on it. She materializes inside the house and starts sleeping in a bed for the first time in 81 years. She appeared in the Give Yourself Goosebumps book, The Curse of the Creeping Coffin.
 * Emmy: A digital being who has a brain, a voice and no body. She can hijack any electronics to communicate with a person, zap them, or melt the electronics that she's in. She appeared in Don't Scream!
 * Evil Boris: A ghost that's half skeleton and half human. Most of his skin was missing on his face, yellowed bone of his skull, his eyes were sunk deep in their sockets, his nose was missing, so it just a hole on the front of his face and his mouth was an open, empty gash. He wore a ratty black cape and baggy, torn trouser and he was barefoot, so one foot had skin, but the other was just bone. He appeared in Goosebumps Wanted: The Haunted Mask.
 * Evil Genie: A genie that is over 8 ft tall, and he is so ugly is because big boils cover his face and arms, and the hair grows out of his nose and ears. So whoever summons him gets to serve him at his castle. He'd appears in Under the Magician's Spell.
 * Evil Knight: A suit of black armor containing the soul of a villainous knight. He works for an evil sorceress. He was the one who killed off Sir Edmund Saxton and his family as payback for killing off the sorceress' favorite pet dragon. The reader dons Sir Edmund's armor and defeats the Evil Knight, causing the sorceress to lose her powers and break the curse. He appears in the Give Yourself Goosebumps book, The Knight in Screaming Armor.

F

 * The Fabulous Flame: A man who is on fire even though it doesn't burn himself. He can burn anything and anyone down with his fire, and also wears dark pants and a dark turtleneck sweater. He appeared in The Wizard of Ooze.
 * Fifi: The reader's pet poodle in Please Don't Feed the Vampire! If the reader doesn't open the packet of blood-red Vampire Blood, she sinks her teeth into the packet and becomes a ferocious vampire dog.
 * Fish Monster: A crazy aquatic beast that the reader turns into after eating a pear enchanted by the Muglani. Depending on which path the reader takes, he or she may or may not end up as a fish monster forever. It appears in the Give Yourself Goosebumps book, Deep in the Jungle of Doom.
 * Flying Sharks: Exactly that - sharks who can fly as well as swim. They appear in the Give Yourself Goosebumps book, The Creepy Creations of Professor Shock.
 * Four-Armed Gorilla: A disgusting four-armed creature. It's about the size of a gorilla, enormous green eyes that are surrounded by thick red fur over its face, saliva that drooled from its mouth and as it opened its jaws wider, two rows of long fangs slid over its thin purple lips, and on each of its four arms they each have four enormous clawed hands. It appeared in One Day at HorrorLand.
 * Fried Shrimp: Edible creatures that are shaped like worms, have fluttery wings and can burrow into a person's skin and the only way to remove these fried shrimps from the skin is with hot sauce. They appeared in Little Shop of Hamsters.
 * Fun House Freaks: People who are twisted and warped as a result of stepping through fun house mirrors. They appear in the Give Yourself Goosebumps book, The Creepy Creations of Professor Shock.
 * Fur-Covered Snake: It's a very rare snake that is covered in fur. It appeared in One Day at HorrorLand.

G

 * Garden Snake: The only snake that can talk, let alone that it wasn't a transformed scientist. It appeared in Welcome to Camp Slither.
 * Gargoyle: Thought to be a statue, this monster attacked a boy named Adam. It attacked him by spitting out green slime that turns anything to stone. It appeared in the short story, I'm Telling! Gargoyles also appear in Shop Till You Drop...Dead!, and in one bad ending, the gargoyles bring the reader and Julie into their world, where humans are used in the same way gargoyles function in the human world, and in Deep in the Jungle of Doom.
 * Ghosts: Ghosts are very common in the Goosebumps series. They are the spirits of people who have died and they usually look like when they were alive. They appeared in The Ghost Next Door, Piano Lessons Can Be Murder, Ghost Beach, Phantom of the Auditorium, The Headless Ghost, Ghost Camp and The Curse of Camp Cold Lake. Ghosts also appeared in Headless Halloween, The Haunted Car and Return to Ghost Camp from Goosebumps Series 2000, in several books from the Give Yourself Goosebumps series such as The Curse of the Creeping Coffin and Checkout Time at the Dead-End Hotel and in various short stories.
 * Ghost Dogs​: The ghosts of two friends who are in the form of spectral dogs. They had an evil spell cast upon them centuries ago after they fell down a large hole in an old shack. The spell doomed them to roam the woods of Maine as ghost dogs. They appeared in ​The Barking Ghost ​.
 * Ghost Horses: These horses are in fact dead because a malicious prankster used the Haunted Mask to scare them to death. They appeared in The Scream of the Haunted Mask.
 * Ghost Snake: A ghostly snake with razor sharp fangs that drips ghostly poison. It appears in The Curse of the Creeping Coffin.
 * Ghostly Witches: They're a witch's hat first, but once they are brought to life by magic they gain a body and a ghostly-green head. They can also fly into the air by riding on their broomsticks. They appeared in the 2018 film Goosebumps 2: Haunted Halloween.
 * Giant: A giant sorcerer that can use magic to transform anyone especially the reader into a ventriloquist dummy. He'd appeared in Under the Magician's Spell.
 * Giant Ants: Ants that grew into giants due to being fed incorrectly. They appeared in the short story, Awesome Ants.
 * Giant Bat: A huge and hairy bat and its the most hideous thing that anyone seen. It has wings, a hairy brown body, a pair of an enormous ears that are so thin you can see the veins running through them and two beady black eyes. It appears in Deep in the Jungle of Doom.
 * Giant Bear Monster: A huge bear-like creature. It has a pair of powerful paws, and a dark round head. It can stand on two legs and laughed like a hyena. It appeared in One Day at HorrorLand.
 * Giant Black Cats: Apair of huge black cats with yellow eyes. Since they're so huge they could eat a person in one big gulp after they're done playing with their food. They appeared in Legend of the Lost Legend.
 * Giant Blue Fish: A huge fish that lived in a stream in a weird forest. It appeared in The Beast from the East.
 * Giant Boa Constrictor: Its a boa constrictor that's so huge the reader mistaken it as a vine when he/she has a good grip on it. It appears in Deep in the Jungle of Doom.
 * Giant Burrowing Spider: A giant spider that is covered with thick brown hairs and it has these pincers that can snap open and closed. It appears in Deep in the Jungle of Doom.
 * Giant Butterfly: A huge butterfly that is wielding a giant pin. It appeared in Go Eat Worms!
 * Giant Canary: A pet bird that is about the size of a turkey. It saliva carries a growth hormone that can grow anyone back to their normal size once it made contact. The canary appeared in Night of the Giant Everything.
 * Giant Cranes: A pair of crane-like birds that stands at least 10 ft tall and when they flapped their enormous wings. It sounded like a canvas tents flapping in a strong wind. They appeared in One Day at HorrorLand and one of them appeared in Escape from the Carnival of Horrors.
 * Giant Crickets: Enormous and ugly crickets that can get in from the outside through the cracks in the basement walls and they hop all over the basement. They appear in The Curse of the Creeping Coffin.
 * Giant Crows: A pair of huge black birds that can swoop low in the sky. They appeared in One Day at HorrorLand.
 * Giant Elephant Monster: A furry elephant-like creature that is so big that it can flatten a person with one of it's foot. It appeared in One Day at HorrorLand.
 * Giant Goldfish: A goldfish that is about the size of a whale. It appears in the short story called Something Fishy.
 * Giant Hermit Crab: The biggest, and ugliest sea creature that anyone has ever seen. Its has these bulging red eyes that bounced on the ends of two long stem, a huge green mouth that slammed open and shut with a hideous slurp, and enormous cruel claws also it lived inside a biggest seashell in the world. It appeared in the short story Shell Shocker.
 * Giant Insects: A group of enormous, buzzing insects with glowing red eyes. They appeared in One Day at HorrorLand and in You're Plant Food!
 * Giant Mutant Squid: A giant squid that's been mistaken for a plant. It has tentacles, a gaping mouth with huge, jagged teeth and a bulb-like head. This creature has appeared in A Nightmare on Clown Street.
 * Giant Piranha: An enormous piranha that can talk and grants the reader a wish if he/she toss the fish back in the pond. It appears in Deep in the Jungle of Doom.
 * ​Giant Praying Mantises:  Giant praying mantis robots that appeared in ​​A Shocker on Shock Street, ​although one did appeared as a real insect in the Goosebumps film.
 * Giant Scorpion: A huge scorpion that can talk and is the friend of the magician. It appears in Under the Magician's Spell.
 * Giant Seagulls: Seagulls that ate the infected plankton and turned into giants. They appeared in the Goosebumps book, Deep Trouble II:.
 * Giant Snake: A slimy snake that is so big that the reader mistaken it as a path. It appears in Under the Magician's Spell.
 * Giant Snapping Turtle: A turtle that's so big it can carry the reader underwater. It appeared in You're Plant Food!
 * Giant Stone Beast: A stone beast that is so big that the entrance to cave is it's mouth. It appears in Deep in the Jungle of Doom.
 * Giant Vultures: A bunch of enormous black vultures with black wings that stretched wide and bald white heads craned. They appeared in Return to HorrorLand.
 * Glory: The ghost of a horse that the reader can encounter if he/she chooses to investigate the sounds coming from his/her grandmother's attic. Glory's tombstone describes him as being "too wild for the riders of this world", which could imply that he was put down. Glory is depicted as being temperamental, by stomping on the attic stairs and frothing at the mouth. In one ending (in which the reader dies) it is revealed that Glory can pass through solid objects. He is somehow affected by a remote control in one ending, and doesn't fit into the message used to complete this book properly. Appears in The Curse of the Creeping Coffin.
 * Gorgon: It's a creature that has the body of a giant snake and the head of a human, also in place of hair it has hundreds of tiny snakes wriggle on its scalp. It wraps around the reader, crushing every bone in his/hers body. Then it swallows the reader. It appeared in Little Comic Shop of Horrors.
 * Goths: A race of mutant sorcerers that can cast magical spells. They appeared in Be Afraid – Be Very Afraid!.
 * Grace: A baby who can speak like an actual man. She'd appeared in a short story called Strained Peas.
 * Granny Kapusta: A witch who appears in Under the Magician's Spell. She gives the reader a glass of milk and freezes them in place, or else turns into a werewolf and eats them up.
 * Great-Aunt Abigail: An alien from outer space. She has four slimy tentacles, a skin that glowed bright green, and three fat, black lips that made these sucking sounds as she unrolled a long blue tongue. She'd appeared in the short story called Strangers in the Woods.
 * The Great Gargantua: Gigi for short, the Great Gargantua is a monster held captive in the theme park HorrorLand and was used to put on shows before she escaped. She is from Goosebumps HorrorLand The Video Game.
 * Green Army Men: A group plastic army men, comprised of at least 100, who wield little green plastic rifles tipped with a little green metal bayonets. They come to life at night at the toy factory. They appeared in Toy Terror: Batteries Included.
 * The Grool: A living sponge creature that feeds on despair. It appeared in the Goosebumps book, It Came from Beneath the Sink!
 * Grunting Pigs: A group of 6 growling pig-like creatures with sharp, pointed teeth curling from their twisted mouths. They appeared in One Day at HorrorLand.
 * Guard Dragon: A type of dragon that guards the Fireheart tree. It has short spikes covering its head and run down its spine even though its not quite gigantic, but it looks quite deadly, it has rows of jagged teeth and sharp rippling scales and two evil-looking green eyes with a stripe of fiery red. It appears in Deep in the Jungle of Doom.
 * Gummy Bears: They are hundreds of gummy bears that Slappy brings to life with his powers in the film Goosebumps 2: Haunted Halloween. They have the ability to combine with each other in order to make themselves bigger and bigger.

H

 * Hairball Monster: A hopping furry ball-like creature that has these sharp teeth that are poking out of the monster's three mouths and it can roar as it hopped. It appeared in One Day at HorrorLand.
 * Halley Tosis:  A huge brown beetle-like insect creature. It is as big as a school bus. It has an antennae that bends from side to side, prickly legs, and spiky black hair that pokes out from its body. It uses its mouth to send out a thundering blast of putrid air that can make anyone that smells it starts to gag and fall down to their knees. It appears in Dr. Maniac Will See You Now.
 * Hamsters: They're just regular hamsters at first, but, in the Goosebumps HorrorLand book, Little Shop of Hamsters, they are given a special kind of water called Vito-Vigor, which causes them to become furious pests.
 * The Haunter:  The name given to the ghost of Benjamin Marple. The Haunter has the power to control the minds of humans and force them to act wildly. The ghost appears in the book The Haunter.
 * The Haunted Car: A possessed, silvery-blue sports sedan with white-leather seats and a V8 engine. It was once the property of the Douglas family in the town of Forrest Valley, until teenage daughter, Becka Douglas crashed it during a joyride, in which she was killed. Her ghost took hold of the car and tried to use it as a weapon against those around her, forcing her father to keep the car locked up tightly in its garage until a new owner was found. The Haunted Car appears in The Haunted Car.
 * The Haunted Mask: A real living face, one of many who searches for a new body to wear as its own. Originally, the mask was beautiful, but it decayed and became a dangerous monster, along with the other faces that were created by the same person. This happened because while the masks could hide his ugly face, they could not hide what he really felt: ugly. If someone puts the mask on, it cannot be removed, except with a symbol of love or kindness. The Haunted Mask appears in the following books: The Haunted Mask, The Scream of the Haunted Mask, and Goosebumps Wanted: The Haunted Mask.
 * The Haunted Pumpkin: A gigantic jack-o'-lantern that is big as a circus tent that can breathe fire. It appeares in Weirdo Halloween.
 * Headless Horseman: He's a Halloween decoration at first, but once brought to life by magic, he bursts out a flame on where the head should be, and he rides on a white horse. He appeared in the 2018 movie called Goosebumps 2: Haunted Halloween.
 * Himalayan Snow Wolf Mask: This mask looks like a Himalayan wolf. However, once you put it on, you'll be transformed into a wolf. This mask appears in The Five Masks of Dr. Screem.
 * Horrible Hairy Harry: A monster that runs Lucky Day. He looks like a cross between a gorilla and a troll. All he wears is a pair of Bermuda shorts, but the rest of him including his face is covered with thick brown greasy-looking hair and he's about 9 feet tall. He appeared in Return to the Carnival of Horrors.
 * The HorrorLand Horrors: The employees of the HorrorLand Theme park, they are reptilian like monsters. Originally hired by HorrorLand's founder because their monster costumes looked so realistic, he later realized their "costumes", with green skin, yellow eyes, sharp fangs and long tails, were not costumes at all! Originally, they deflated if pinched. However, by the time of Goosebumps HorrorLand, the Horrors have found new ways to become 100% pinch-proof. The Horrors originally appeared in One Day at HorrorLand, reappearing in the game Escape from HorrorLand and related media, the Goosebumps Series 2000 book Return to HorrorLand, and most recently as main villains for the entire series Goosebumps HorrorLand.
 * Hot Dogs: Creatures that look like actual hot dogs except they eat people. They appeared in Return to the Carnival of Horrors.
 * Humanigators: Mutated humanoid alligators created by Dr. Aqua. They appear in Invaders from the Big Screen.
 * Hungry Ferret: A group of mustelids that like to have a taste of human flesh. They appear in Return to HorrorLand.

I

 * The Ice Hound: A wolf-like creature who resides in the Frozen North. It appears in one of the virtual reality games in the Give Yourself Goosebumps book, Zapped in Space. In one bad ending, it feeds Andy and the reader to its puppies.
 * The Ice Vampire: A vampire made out of solid ice that survives by draining the internal heat from human beings, thus turning them into ice in the process. Appeared in the short story, The Ice Vampire.
 * Imps: Creatures that have wings like bats, but they have the bodies of small monkeys. They appeared in Return to the Carnival of Horrors.
 * Inspector Cranium: Inspector Cranium is a detective with the most notable features are his large head that seems too big for his body and his scalp glows like a light bulb under lights. He is not much taller than some kids and has tiny, round black eyes, a long bent nose, thick gray eyebrows, a small gray brush of beard on his chin and a gold tooth that glows when he is smiling, he appears in the Goosebumps HorrorLand Help! We Have Strange Powers! and The Streets of Panic Park.
 * Insect Mask: This mask is colored olive green, has a face of a grasshopper, it has wiry antennae on top of the smooth green head, tiny black eyes, and an open mouth with a stringy black forked tongue. It appeared in The Five Masks of Dr. Screem.
 * Ivanna: A viking from long ago. She had flashing, bright green eyes, blond bangs fell across her forehead, and long braids that hung down the sides of her round-cheeked face, and she wore a cone-shaped helmet with two horns poking up from the sides. She'd appeared in Legend of the Lost Legend.

J

 * Captain Jack the Knife: A pirate who lives in a jack-in-the-box. He wore a red bandanna over his black hair. A bright blue jacket over a black-and-white-striped shirt. He had large brown eyes and a long nose above a black mustache. He carried a long-bladed knife in his hand, but in his left was a curled metal hook. He is allergic to clams and afraid of ghosts, also he can grow and shrink. He appeared in Attack of the Jack!
 * Jekels: Evil little men/hunter that are dressed in ragged furs. They wear these dome-like metal helmets on their hairy heads which it glowed dully in the starlight. They also carried long, pointed spears at their sides which they used to hunt humans. They appeared in Be Afraid – Be Very Afraid!.
 * Jenna: A genie (dressed more like a punk rocker than a stereotypical genie) who emerges from a Coca-Cola can. With each wish she grants, her appearance changes into a more corrupted being, and each of her wishes have difficulty in turning out the way one would expect. She appeared in the Give Yourself Goosebumps book, Scream of the Evil Genie, and as a cameo in Checkout Time at the Dead-End Hotel.
 * John and Jane, the Luckmeyer twins: Two ghosts of twins. They appeared in the Give Yourself Goosebumps book, The Curse of the Creeping Coffin.
 * Jonathan Chiller: A man who trapped six children Meg, Marco, Ray, Jessica, Andy, and Sam. He made them play a game that risked their lives. He appeared in The Horror at Chiller House and is the main villain of the second Goosebumps HorrorLand arc of books.

K

 * Kanduu: A sorcerer who knows dark magic say like evil spells. He could control people and make them say and do things that they didn't want to do. He was mentioned in I Am Slappy's Evil Twin.
 * Karl Knave: A miniature toy who created a miniature toy town called Karlsville. He is full of himself. He sucks children into his toy town and would turn their interests against them. For example, Todd Erikson always wanted to win a prize, like the lottery. When he gets to Karsville, he has won something -- a chance to become a citizen of Karlsville. That means he has to be turned into a plastic toy, forever. Appeared in the mini-series, Goosebumps: Chillogy (1998). Portrayed by Daniel Kash.
 * Katrina the Keeper of Cats: A cat woman who is trying to find someone new to be the next Keeper of Cats. She is the primary antagonist in Night of a Thousand Claws.
 * Keith: A monster boy who can turn himself inside out, and lives with his mother in the basement of a boy named Marco. Appeared in I Live in Your Basement!
 * King Buthramaman: The last great Ruler of Egypt. He was entombed because he bore a strange birthmark. The shape of the birthmark frightened the Egyptians, for they believed it was an evil sign. Every night, his spirit writes in his diary. Whichever route the reader takes will affect how Buthramaman interacts with the reader. He appears in Diary of a Mad Mummy.
 * ​King Cottonhead:  The ruler of a forgotten race of cave people discovered in Deep in the Jungle of Doom. When the reader and her/his friend Zoe happen open the king and his clan, he gives them a timepiece and tells them to retrieve gold nuggets for him. Depending on which way the reader chooses, the king may slip something into your food so you become like them, turn you into stone for stealing his timepiece, or reward you handsomely for completing the task.
 * King Jellyjam: A grotesque, purple behemoth who wears a gold crown, with snails dripping out of his skin and an awful stench. King Jellyjam brainwashed innocent men and women to run King Jellyjam's Sports Camp, a summer camp for children who participate in athletic events. Those who win the events are given gold coins called King Coins, and those who win six coins are allowed to join in the Winner's Walk. The truth is, these children are made his slaves, who are forced to wash him nonstop because he cannot stand his rotting stench. If any of the children stop to take a break, they get eaten. His scheme was eventually stopped by a girl named Wendy, who convinced the children to stop washing him and lay flat on their stomachs. Jellyjam could not pick up the children, or any of their hoses, because his fingers are too fat, and he chokes on his own stench. The counselors are snapped out of their trance the minute Jellyjam dies, and the truth is discovered by the police of a nearby town who were searching for the source of the foul stench. Appeared in The Horror at Camp Jellyjam. Also of note, Milo the Mutant, from Little Comic Shop of Horrors, is able to take his form.
 * Krel: An ugly dwarf-creature. He has a big, round head that has black curly hair that are down past his shoulders, a short black beard, green eyes, pink pointed ears and an animal snout in place of a nose. He wore a dark fur waistcoat (which is very hairy) over black leather trousers, and furry brown slippers that came to a point. He appeared in Be Afraid – Be Very Afraid!.
 * Kung-Fu Master Ghost: It's a kind of ghost that knows kung-fu. It appears in The Curse of the Creeping Coffin.

L

 * Lake Monster: A mysterious creature living at the bottom of Woodsworld lake. It appeared in the Give Yourself Goosebumps book, Night in Werewolf Woods.
 * The Lanx: A more dangerous relative of the Grool. The Lanx looks like a potato with a mouth, and its mouth is filled with sharp fangs. It appears in It Came from Beneath the Sink!.
 * Laura Henry: The character who accidentally scared the horse to death with the Haunted Mask, which causes the horses to trample her to death. She returns as a ghost in The Scream of the Haunted Mask.
 * Lava Lizards: Ever since Mount Kenalua started erupting, the volcanic grounds have been crawling with these Lava Lizards. Their lava-colored skin allows them to blend in with the molten rock, which allows them to hide themselves from the eyes of any trespassers. They appear in the book, The Twisted Tale of Tiki Island.
 * The Lawn Gnomes: Creatures that are actually Mischief Elves, beings who love to cause trouble. They can enter a trance willingly in order to go into an unmoving state (in which they are mistaken for lawn gnomes), then awaken at night in order to wreak havoc. However, they can be forced into their unmoving state again by extremely high-pitched sounds, such as that of a dog whistle. They appeared in the Goosebumps books, Revenge of the Lawn Gnomes and Planet of the Lawn Gnomes.
 * Lefty, Righty, and Slim: These three conjoined characters were the mascots for the Goosebumps Triple Header series. Lefty is the joker, Righty is the smart one, and Slim (the middle head) is the leader.
 * Lillian: A spirit that lives inside of a Day of the Dead Mask. Her hair is tinted blue, and she has a pale face with blue eyes. She also has a golden tooth, and she wears long skirts. Additionally, she can shape-shift into a crow. She appeared in Trick or Trap.
 * Lionulleagle: A creature that has the body of a bull, the wings of an eagle, and the head of a lion. It appeared in Little Comic Shop of Horrors.
 * Lizard Monster: A disgusting yellow lizard-like creature with a dark, flickering tongue that looks like a bullwhip. It appeared in One Day at HorrorLand.
 * Lord High Executioner:  An executioner who works for the evil uncle of Princess Susannah and Prince Edward. He has executed everyone from the common criminal to the parents of the Princess and Prince, and has the complete trust of their uncle. He appears in the Goosebumps book, A Night in Terror Tower and the Give Yourself Goosebumps book, Return to Terror Tower.
 * Loreo: A monster who appears in The Creepy Creations of Professor Shock. It resembles a furry crocodilian, and it likes to eat kids. It is also the announcer of a Fun House Freak Contest.
 * Lost Legend: A scrap of parchment that brings ill fortune to anyone who finds it. It says, "Whoever owns the Lost Legend will be lost forever." After Marissa and Justin Clarke find it, they lose their sense of direction. It appears in the Goosebumps book, Legend of the Lost Legend.
 * Lucy: A young camper from Camp Spirit Moon who turned out to be a ghost. She appeared in the Goosebumps book, Ghost Camp.
 * Luka: A creature that has black fur and a human face, also he behaved both as a human and a dog. He appeared in Legend of the Lost Legend.

M

 * Madame Doom: A mysterious fortune-teller in HorrorLand. She appears in the Goosebumps HorrorLand book series (such as Help! We Have Strange Powers!) and on the EnterHorrorLand Website. The inspiration for her was the witch Clarissa from the Goosebumps book, Be Careful What You Wish For....
 * Maddy Simon:  Her and her friends attempted to find out if Helga Nuegenstorm was a vampire. At the end of the short story, A Vampire in the Neighborhood, she and her friends turned out to be vampires.
 * Maggie: A magic crow, used by a witch, called Iris, to cast spells. This happens by closing the eyes, thinking of the spell and stroking Maggie three times. She has a sister named Minnie. Maggie appears in Revenge R Us.
 * The Magician: The evil owner of a magic shop. The Magician appears in the Give Yourself Goosebumps book, Under the Magician's Spell.
 * Mannequins: Usually for displaying clothes, these figures are dressed to kill and seek nothing more than to dismember the reader. They appear in Shop Till You Drop...Dead!
 * Margo: She's a real-life/video game character from the video game Escape from Shudder Mansion. Even though she seems weak and harmless, she has supernatural strength. She appears in Escape from Shudder Mansion.
 * Masked Man: A tall man dressed in a sequined white suit and wears a blue mask that covers half of his face. He'd appears in Under the Magician's Spell.
 * Masked Monkey: A chimpanzee that has the strength of ten gorillas. This chimp wears a black mask to conceal it's identity. It appears in Dr. Maniac Will See You Now.
 * The Masked Mutant: A comic villain that can shape shift into anything solid, but if he turns into a liquid, he can't change back into his original form. Appeared in Attack of the Mutant and also in the video game version of the same name.
 * The Marcus Family: A family of ghosts that spends Christmas in the haunted house in the attic and they can't start the Christmas fun til a new member who will stay with the ghostly family forever. They appeared in the Goosebumps Christmas Special Edition book The 12 Screams of Christmas.
 * Mary-Ellen: An evil doll from Bride of the Living Dummy.
 * Max Creeper: The son of E. Ville Creeper, Max runs his father's botanical gardens. He appears in the Give Yourself Goosebumps book, You're Plant Food!.
 * Mechanoid: The mechanoids are robots that are created by the lawn gnomes. mechanoids are designed for doing the lawn gnomes' work during the day time. The only way to tell if a person is a mechanoid is if the mechanoid malfunctions. It appears in Planet of the Lawn Gnomes.
 * Melvin Estep II: A huge MHG (that stands for most horrible ghost). He has a skull filled with rats in his eye sockets, strips of rotting flesh that falls from his skeletal body, a pair of bloody hands and he is covered in shredded rags that are teeming with bugs. He appears in The Curse of the Creeping Coffin.
 * The Menace: The owner of Panic Park. This two-faced man tries to trap all the VSG's in Panic Park forever to bring Panic Park back from 1974. Appeared in The Streets of Panic Park.
 * Mia: She's a real-life/video game character from the video game of the same name and the daughter of the video game monsters who lived in a mansion. She'd appeared in Escape from Shudder Mansion.
 * Milo: A strange looking man, with a warty face, who owns a comic shop in a mysterious alleyway. He is actually a monster from a cancelled comic book series, that has somehow been brought to life. His mission is to trap children in the basement under his store, and keep them there as he tests out various ways to scare them, so he can eventually create a new series. He is apparently able to scan a person's mind to see what they are most scared of, and then become that thing (this leads to a reference to another Goosebumps book). Appears in Little Comic Shop of Horrors.
 * Mirror monsters: These are crab-like monsters from an alternate world, and the passageway to this world is through a special mirror owned by Jason Sloves. These creatures have fat, red tongues, and pale, wet skin. Each one has a bulbous, red nose with three nostrils and a pair of large yellow eyes. They are equipped with hard, purple shells, and each one has pair of enormous red claws. These monsters can possesses humans and animals. They appeared in Ghost in the Mirror.
 * Misty: A black cat that wants to be human in order to do that it'll need the body of the one who owns this cat, and the person who owns Misty will become a cat permanently. It appears in a short story called The Cat's Tale.
 * Mittens: A mechanical Doberman who appears in Toy Terror: Batteries Included. He was manufactured by the Hasley Toy Company and actually has some of the same features as a real dog (such as salivation). He seems to have a habit of attacking people's legs.
 * Monty's Clones: Monty's clones are determined to get rid of the original Monty so that one of them can replace him. The clones first appeared in the Goosebumps Series 2000 book I Am Your Evil Twin.
 * Monsters: A group of lizard-like aliens hatch out of eggs and only Michael Monroe sees it. If someone drink the yolk you turn into one. Michael's teacher and principal were one also. He eats eggs made out of the yolk and turns into one. Then he eats a little eggs which worked half way. He throws his teacher and principal into a much larger one and they drown. Then the remaining monsters eat some eggs and turn into yolk. They appeared in My Friends Call Me Monster.
 * Monster Blood: A green, slimy substance that slowly expands to a great size when released from its airtight container for the first time. In the first book, Evan and Andy's specific batch of Monster Blood seems to have been cursed by an evil witch, but several more cans appear in sequels, confusing the issue. Though it is sold as a child's plaything, both in cans (as in Monster Blood, Monster Blood II, and Monster Blood III) and in plastic egg-shaped containers (as in the Goosebumps HorrorLand book, Monster Blood for Breakfast!), the Monster Blood is a living, evil entity, capable of attacking people if they are close enough (Evan Ross is almost drowned in the bathtub containing Monster Blood). In addition to its growth properties, any biological creature that consumes Monster Blood will slowly grow to monstrous size (which is the main plot point in Monster Blood II and Monster Blood III). It comes in the original variety, which is labeled as a "Surprising Miracle Substance!" (as seen in the first three books), a twelve-hour sample version (as seen in Monster Blood For Breakfast!), and a "new and improved, longer-lasting" Monster Blood, as advertised on the packaging for the "Sample" version. Monster Blood is also used and mentioned in the Give Yourself Goosebumps series, in the book Escape from the Carnival of Horrors, and shown on TV in the Goosebumps Series 2000 book Return to HorrorLand.  There is also another kind of monster blood. This slime is blue instead of green and it does not grow, it is multiplying into dangerous blue creatures with sharp teeth. Who ever eats this Monster Blood will begin to multiply. This special monster blood species only appears in Monster Blood IV.
 * Monster Dentist: A kind of dentist for a ride called "HAPPY TOOTH GAME". They have hairy, dripping snouts, yellow fangs curled out from blubbery purple mouths, pointed ears poked up from the thick black fur that tumbled down over their round glowing eyes and bulky bodies, also they wielded these drills in their hairy paws to drill the teeth out of a persons mouth. They appears in Return to HorrorLand.
 * Morphing Plant: A kind of mutant plant that can shape-shift into any objects that can destroy the reader, and the only way to defeat this plant is freezing it. It appeared in You're Plant Food!
 * Mortegarths: Ghosts who are relatives to Drew Mortegarth who all died in Room 402. After they died, the turned into ghosts and started to haunt the entire hotel. They appeared in the Give Yourself Goosebumps book, Checkout Time at the Dead-End Hotel.
 * Mr. Baargh: A huge, two-headed ugly monster. He appeared in Creature Teacher: The Final Exam.
 * Mr. Blakenship: A shape-shifting snake. So when he's in his snake form he looks like a giant black cobra, and in his human form he looks like your average teacher except he's really, really, tall and really, really skinny and he was almost completely bald. He'd appeared in the short story called Teacher's Pet.
 * Mr. and Mrs. Dark: Lucy's parents who appeared in The Girl Who Cried Monster. It is they who are really weary of Lucy's monster stories. They provide the fuel for the story to progress. First, they ignore Lucy's claims that she has seen a real monster. Second, they decide to invite Mr. Mortman to dinner after Lucy attempts to capture him on a camcorder wherein he did not cast a reflection. Finally, the parents provide the surprise ending to the story; they are monsters, too. And the reason why the parents invited Mr. Mortman for dinner was because he was the "dinner" all along. Note that unlike Mr. Mortman who needs to eat insects to provide stimulation for his transformation, the parents can transform at will. They reveal to Lucy and Randy that they are not "fully" developed, but will eventually grow to be a monster just like them. In the book, they only grow fangs. But in the show, they grow fangs, and then they have reptilian features.
 * Mr. Dove: The owner of a rundown hotel called "Bird Haven Lodge". He used his hedge trimmers to transform anyone into a bird or an animal that eats bird like a cat. He'd appeared in the short story called For the Birds.
 * Mr. Fitz: The owner of a pet shop that sells nothing but hamsters. He uses a special water called Vito-Vigor that can make anyone who drinks it into a mean killer machine. He appeared in one of Goosebumps HorrorLand book called Little Shop of Hamsters.
 * Mr. Knowledge: A character who appeared in Under the Magician's Spell. He tests people to see if they can find a red ball under one of three identical cups. If anyone accuses him of cheating, he gets mad and turns into a monster.
 * Mr. Lucky Luck: A short man with bright red hair. The reason why his last name is Lucky Luck is in fact that he is wearing a shirt covered with four-leaf clovers, a pair rabbits' feet hang from his belt and a horseshoe necklace. He'd appears in Under the Magician's Spell.
 * Mr. Mortman: The creepy librarian and villain of The Girl Who Cried Monster. No one knows that he can transform into a monster until Lucy inexplicably stumbles upon his transformation because she forgot her roller blades. Note that Mr. Mortman can only transform into a monster if he eats crickets and other insects. His eyes bulge out while the top half of his head has bubbly and slimy skin.
 * Mr. Rambler Gambler: A tall man in a sparkling gold suit and there are some diamond sparkles on his fingers. He'd appears in Under the Magician's Spell.
 * Mr. Smith: A sports fan and director of the sports museum. And how does he make these statue of athletes look realistic? Simple, he used these podium, when anyone who'd makes a big swing while standing on it a blast of light will instantly freeze them in place. He'd appeared in the short story called How I Won My Bat.
 * Mr. Wood: An evil living dummy that can be brought to life by saying "Karru marri odonna loma molonu karrano", which means "You and I are one now". He was eventually destroyed by getting crushed by a road roller. Appeared in Night of the Living Dummy.
 * Mrs. Forster: A woman who changes into a spider to get revenge on a child named Shawna when he broke a china bowl. She kept appearing everywhere. Appeared in a short story, Home Sweet Home.
 * Mrs. Hardesty: Michael Munroe's Social Studies teacher who despises him. Michael is always up to no good by making a fool of her in class, disrespecting the evil spirits, sneaking in her house, watching her hatch an alien egg, and planning to wipe the human race off the earth. She appeared in My Friends Call Me Monster.
 * Mrs. Hatfield: A sweet old lady who is about 90 years old and is the reader's piano teacher. She'd appears in The Curse of the Creeping Coffin.
 * Mrs. Maargh: A monster in teacher disguise. At the end of each term, she eats children depending on how bad they have been. Mrs. Maargh appears in Creature Teacher and Creature Teacher: The Final Exam.
 * Mrs. Nine Lives: A tall woman that is dressed like a black cat and you can see two cat ears that sticks up on either side of her head. She'd appears in Under the Magician's Spell.
 * Mud Monsters: Not much information is known about these creatures made of mud. They appear in You Can't Scare Me!
 * Mud Slinger: A short, square-bodied mud beast that use its gorilla arm to throw a handfuls of thick oozing mud that once it made contact it starts to harden and crack. It appears in The Knight in Screaming Armor.
 * Muglani: A tribe of witch doctors who have a strong dislike for humans (even though they themselves are human). They seek to turn any and all humans into animals or monsters. Or shrink their heads. They appear in Deep in the Jungle of Doom.
 * Mummies: Mummies who appeared in The Curse of the Mummy's Tomb and Return of the Mummy. They also appeared in the Goosebumps Series 2000 book The Mummy Walks, in several Give Yourself Goosebumps books such as Diary of a Mad Mummy and in various short stories.
 * Mummy Mask: A mask looks like the face of a mummy. Its eyes are sunken, and the wrappings around it appears torn and stained. It appears in The Five Masks of Dr. Screem.
 * Murder the Clown: There are two versions, Murder the Clown (Jonathan Chiller) from When the Ghost Dog Howls and The Horror at Chiller House and Murder the Clown (Uncle Theo) from A Nightmare on Clown Street.
 * Mutant Bugs: Large insects that can walk upright on two of their six legs and very strong. They have swollen, armor-plated stomachs, huge, glittering eyes, and sharp pincers. They appeared in You're Plant Food!

N

 * Nasty Kathy: A living doll with a rude attitude. Nasty Kathy wears a pink dress and shoes and has pigtails, blue (or red) eyes, and two rows of small, sharp teeth. She says all kinds of insults, slam-downs, and nasty cracks to anyone she meets. Nasty Kathy runs the Hasley toy factory after hours. She is one of the villains in the Give Yourself Goosebumps book, Toy Terror: Batteries Included.
 * Nathan: He's one of the scientist/camp counselors that's been transformed into a rattlesnake. He'd appeared in Welcome to Camp Slither.
 * Neanderthal Ghost: Its a big hairy guy with slumpy shoulders, long arms and wields a huge wooden club. It appears in The Curse of the Creeping Coffin.
 * Count Nightwing: A vampire summoned from opening a bottle of Vampire Breath. He goes after Freddie and Cara. In the end, Freddie's mother recognizes Count Nightwing as her father. He appeared in the Goosebumps book, Vampire Breath.
 * Nick: A reptile friend that appeared in the Give Yourself Goosebumps book, Trapped in Bat Wing Hall. In one ending, he nips the reader's head off.
 * Night Crawler: In the Give Yourself Goosebumps book Deep in the Jungle of Doom, the reader accidentally bumps into a carnivorous night crawler within a cavern tunnel. The night crawler then eats the reader alive.
 * Nighthawk: An armored bird that appears in The Knight in Screaming Armor. They are in league with the Evil Knight and the Sorceress for whom he works. They snatch up victims and take them away to their nests, where eggs form around the victims. It is unknown exactly when these eggs hatch out, but it can be speculated that the victims become Nighthawks themselves when they do. The reader's cousin Abbey becomes a Nighthawk at a certain point in the story, depending on which route the reader chooses.
 * Nila Rahmad: Prince Khor-Ru's thousands-year-old sister posing as a journalist. Her goal is to reanimate her mummified brother to reign with him again. She appears in the Goosebumps book Return of the Mummy.
 * Norband: A headless zombie child who appears in Headless Halloween. He hears about what Brandon did and makes him put right all of his wrongdoings. When Brandon's time is up, Norband reveals that he never intended to let Brandon live.
 * The Nutcracker: In the short story Nutcracker Nightmare, this play is actually a spell placed upon the audience.

O

 * Octopus: A menacing mollusk the reader encounters in The Twisted Tale of Tiki Island.
 * Officer Murphy: A life-sized toy police officer created by Nasty Kathy. How he interacts depends on which route the reader chooses. In one ending, when the reader agrees to help out the toys, he puts on an assembly at school and uses the reader as a demonstration doll. He appears in Toy Terror: Batteries Included.
 * Oil Monster: Its a creature that used the deep oil to hide and catch its prey, if the reader manages to step across the oil, he/she can see a large, scaly head rising from the oil, also it can use it's pale green forked tongue to flick out and wrap the reader's ankle. It appeared in Little Comic Shop of Horrors.
 * Old Bear: It's a teddy bear that comes to life at night and starts making a mess in its owner's room. It appeared in the short story called Mr. Teddy.
 * The Ooze: The Ooze is a mountain of a being, whose head is lumpy and bubbly with the shine of oil and he has black and round eyes and broad shoulders. When he opens his mouth, there are two jagged rows of teeth and a blue tongue. He appears in The Wizard of Ooze.
 * Other Chris: He's a robot that looks exactly like the real Chris except when you pull on it's ears they come off easily. He'd appeared in Weirdo Halloween.
 * Other Meg: She's a robot that looks exactly like the real Meg and has the exact memory like the real Meg, so in order to tell them apart is that robots don't bleed blood. She'd appeared in Weirdo Halloween.

P

 * Petey: A white, curly-haired terrier that belong to Amanda and Josh, but thanks to the Dark Falls Citizens, it is now undead and smells really bad. It appeared in Welcome to Dead House.
 * Phantom of the Auditorium: A phantom that haunts an auditorium. He tries to stop a play that he was in, but died before he started. He dies again when he falls down a trap door. He appears in Phantom of the Auditorium.
 * Pinky Flamingo: A mobster who appeared in the video game Attack of the Mutant. He has a grey Mohawk, squinted eyes, large expressive teeth, and wears a flamingo-pink zoot suit. He is armed with ten deadly digits. On his right hand, he has a screwdriver, a drill, a mallet, a chisel, and a sharpener. The other five digits are erasers, which he can use to rub out anything. The player defeats him by spraying him with a fire hose, causing him to swell up and burst.
 * Piranha Monster: A bunch of tiny piranha-like fish that snaps open and close with their jaws. They have blind white eyes, razor-sharp teeth that stick out of their mouths like pincushions and their skin is clear too because you can see their insides as they thrash around. They'd appear in Deep in the Jungle of Doom.
 * Pixie: They're a bunch of little fairies from mythology. They don't use pixie dust, but they're nasty. They appear in The Knight in Screaming Armor.
 * Mutant Plants: Mutated plants that appear in books such as Stay Out of the Basement and You're Plant Food! They consist mainly of vines or tendrils and carnivorous plants. Some of them are even venomous.
 * Poltergeist: A ghostly figure who appears in Escape from Horror House. It can possess anything or anyone it chooses, turning them into monstrous beings.
 * Pomeranian Dogs: Close relatives of the Keeshond, these are two Pomeranian dogs that were featured in the (fictional) movie that was filmed at Payne House. In the movie, they could change from normal dogs into monsters, and the reader finds that they can also do this in real life. They appear as antagonists many times, and are the cause of many endings for the reader. They are also seen on the front cover of the book. These vicious demonic dogs appeared in One Night in Payne House.
 * Poochie's Clone: It's a clone dog that looks like the real Poochie. It appeared in Frankenstein's Dog.
 * Priestess Khala: A priestess who puts a horrifying "curse" on her chamber. She appeared in The Curse of the Mummy's Tomb.
 * Prince Khor-Ru (book 23, Return of the Mummy): A mummy who was brought to life when Gabe recited the chant "Teki Kahru Teki Kahra Teki Khari" five times. He now sought to make people living mummies, like himself.
 * Prince Warwick: He is a headless prince that wore a ruffled white shirt. The collar was pinned shut. Above the collar, the stub of his neck was pink, and there is a dark scab that had formed over the top. It's a good thing that he learned how to use magic otherwise he'll be dead and the only way to communicate with others til he get his head back is by writing. He appears in Goosebumps HorrorLand book called Heads, You Lose.
 * The Pumpkin Heads: Fire breathing pumpkin headed creatures that are actually shape-shifting aliens that eat overweight adults. They appeared in Attack of the Jack-O'-Lanterns.
 * Pumpkin Zombies: They're these kind of zombies that used the vines of the pumpkin to climb out of their grave, so that way once they're on the surface they'll find a person to bring back with them underground to keep company. They appeared in Goosebumps Wanted: The Haunted Mask.
 * Puppet People: the puppet people are three normal marionettes (the king, the knight, and the princess) that move on there own, also they have this curse that whenever touch a victim by the ear that victim gets slowly transformed into a marionette, they appeared in Night of the Puppet People.
 * Purple Bird: It's an unusual bird that has a bright orange bill. It appeared in How to Kill a Monster.
 * Purple Peanut Butter: A jar of purple goo that has a texture similar to peanut butter. The reader finds it stashed away in an old refrigerator in Aunt Fiona's basement. Its flavor is described as "a combination of every delicious dessert you've ever had" -- but only if the reader chooses it first. Otherwise, it'll taste awful, like brussels sprouts, broccoli, and liver. After the reader eats it, they slowly start to shrink. Depending on which route the reader takes, they face one of several different perils, such as fighting a giant mouse, getting chased by a giant Puff the cat, being swept into the sewer systems, ending up in a junkyard, or simply shrinking down to nothing. This substance appeared in the Give Yourself Goosebumps book, Beware of the Purple Peanut Butter.
 * Purple Rage: A super villain from an online comic created by Robby Schwartz. He appears in Dr. Maniac vs. Robby Schwartz and Dr. Maniac Will See You Now.

Q

 * Q Quest Players: Monsters who play the game Q Quest in Return to the Carnival of Horrors. They try to see to it that you lose.
 * Queen of Nightmares: A strange-looking queen with bird-like features who appeared in The Creepy Creations of Professor Shock. She is the ruler of the Mirror Wonderland that the reader and his/her friends, Jason and Stacey enter. She has numerous stone carvings hanging in her chamber, and a large looking glass that shows and tells her all she needs to know.

R

 * Rat Man: A villain from a video game, Mortal Revenge. He is a four-armed ninja fighter, with the head, tail, and other features of a rat. He carries a sword in each hand. The reader encounters this foe when they wish (granted by Jenna the Genie) to do the video game in real life and are zapped inside. But the reader is unable to beat him, even when they start to make a wish from Jenna. It is said that he's the most horrifying warrior in all of Mortal Revenge. He appears only in Scream of the Evil Genie.
 * Rat Monster: A monstrous rat of unusual size. It attacks the reader and grabs them by the throat. It appears in Under the Magician's Spell.
 * Rattlesnake: A giant diamondback rattlesnake with mystical powers. It has the ability to change people into anything it chooses. How it approaches the reader depends on which path they choose. This magical rattlesnake appears in Alone in Snakebite Canyon.
 * Ray: One of the dead children in Dark Falls. Ray is the watcher who watches and pretty much spies on the new families. Ray seems to like baseball and plays a lot with Josh and Amanda. Ray's skin melted off when Josh accidentally pointed his flashlight at him. Ray may be dead, but it could be the same deal with Compton Dawes, whom Amanda thought she saw at the end when they drove away. Ray appears only in the first Goosebumps book, Welcome to Dead House.
 * Reflections: These evil entities want to replace everyone who turns on the light put on the top of the mirror they wait in. It turns people invisible, when the light is turned on. If invisible wait too long, the reflections will replace people and they will come out leaving the people in floating bubbles forever. To save them, you must destroy the mirror with them on the shattered glass. They appear in the sixth Goosebumps book, Let's Get Invisible! Also, in the Give Yourself Goosebumps book, The Creepy Creations of Professor Shock, the reader's own reflection trades places with her or him when a mirror is shattered or being end up fleeing from her or him in terror. An evil reflection also appears in the short story Mirror Mirror on the Wall.
 * Reggie Mayfield: A boy who tells you that there are monsters in his dad's store, Mayfield's Bazaar. At midnight, it's revealed that he is cursed and transforms into a hulking mutant during this time. If the reader chooses the right path, they will end up lifting the curse and restoring Reggie to normal. If not, something bad will happen to the reader (such as getting eaten). Reggie appears only in the Give Yourself Goosebumps book, Shop Till You Drop...Dead!
 * Rip: An undead cat who is named after the abbreviation for Rest in Peace: RIP. If Rip loses one of his nine lives, he looks for new victims, that can spend him theirs. If Rip scratches someone, a bit of their life comes over him. The scratches of Rip glow strange before they heal quickly. People that get scratched by him transform into cat-like creatures. Rip appears in the first Goosebumps Series 2000 book, Cry of the Cat. Rip is very similar to the cat Misty, that appears in the short story, The Cat's Tale.
 * Robby Ferber: He's the son of a Mr. Ferber and if you feed him any treat he'll transform into a monster with a huge appetite, so in his monster form he has green fur, two rows of jagged yellow teeth and he's 8 feet tall. He'd appeared in Please Do Not Feed the Weirdo.
 * Robots: Mechanical machinations that may or may not be humanoid in appearance. They have appeared in a number of books, such as Piano Lessons Can Be Murder, Toy Terror: Batteries Included, The Creepy Creations of Professor Shock and Tick Tock, You're Dead!
 * Robot Zookeepers: These machines are the keepers of a human zoo in Tick Tock, You're Dead! The reader is captured by them and placed in the "Couch Potato" exhibit.
 * Roddy: He's one of the campers that has been transformed into an enormous king snake that only lasted for about 5 minutes. He appeared in Welcome to Camp Slither.
 * Root Rot: A plant-like being who appeared in the video game Attack of the Mutant. He is capable of controlling plants and summoning vine tendrils to do his bidding. But he doesn't really show much in the ways of intelligence. His domain is a greenhouse with a hedge maze. He is later defeated when the player knocks him backwards into a fan.
 * Roses: Mutant alien roses appearing in Secret Agent Grandma. They have many similarities to Earth roses, but are in different colors, have different scents, and even glow in the darkness. The hostile ones have eyes and an ugly mouth, and have thorny tendrils to grab anybody. Also, they can choose to gobble up their victims (such as a taxi driver) or spit orange goo on them, which mutates them into roses. They also make an appearance in You're Plant Food!.
 * Rubber Bat: It's a bat-like toy that you can buy at a Halloween store, but once it was brought to life it glows a pair of glowing green eyes and starts flying around. It appeared in the 2018 film Goosebumps 2: Haunted Halloween.
 * Rubber Hand: It's a talking rubber bloody hand that you buy at a Halloween store. When its spreads out it looks like a giant red spider. It appeared in Toy Terror: Batteries Included.
 * Rubber Rat: It's a rat-like toy that you buy at a Halloween Store, but once it was brought to life it glows a pair of glowing red eyes. It appeared in the 2018 movie called Goosebumps 2: Haunted Halloween.
 * Rubber Snake: It's a toy snake that has every ability of a snake except for poisoning and constricting and they come to life at night here at the toy factory. They appeared in Toy Terror: Batteries Included.

S

 * Sadler Ghosts: The ghosts of three young siblings (Sam, Louisa and Nat Sadler) who died in 1641. They appeared in the Goosebumps book, Ghost Beach.
 * Sarabeth: An evil sorceress who appears in the book Monster Blood. She took on the appearance of a black cat and had since been living with Evan Ross' aunt, Kathryn. She is defeated when Evan's dog, Trigger knocks her into Monster Blood and is consumed by the substance.
 * Sarah McGinnis: She's a fencing ghost who died in 1940 and is the keeper of the sword. She'd appears in The Curse of the Creeping Coffin.
 * Scarlet Starlet: A webcomic character made by Robby Schwartz. She teams up with Dr. Maniac in the Goosebumps HorrorLand book, Dr. Maniac vs. Robby Schwartz and Dr. Maniac Will See You Now.
 * Scarecrows: A bunch of scarecrows that were brought to life by a girl's cousin named Stanley. He did it by chanting magic words. The scarecrows were defeated by his son Sticks when he used torches to light them on fire. They appeared in The Scarecrow Walks at Midnight.
 * Sea Blob: It's an unknown sea creature that is big, green, clammy, and as smelly as a hundred dead fish smelly. It have these suckers like an octopus to cling on anything and every time you tried to shake it off it won't let go and the longer it stays on a person the bigger it gets. It also has an appetite for some gummy worms. It appeared in one of the short stories called Suckers!
 * Sergeant Squash: It's a Jack-O'-Lantern that wears an army's helmet, but once it was brought to life by magic it can talk like an actual sergeant and fires pumpkin seeds from its mouth. It appeared in the 2018 movie called Goosebumps 2: Haunted Halloween.
 * Serpo: It's a giant diamondback water snake that lived in Hither Lake. It's as big as two alligators, and it feast on kids that knows how to swim. It appeared in Welcome to Camp Slither.
 * Shadow Figure: A mysterious ghost-like being made of shadow that stalks Hannah Fairchild. Appeared in The Ghost Next Door.
 * Shadow People: People who had been turned into shadows when Panic Park disappeared. Escape from HorrorLand and The Streets of Panic Park.
 * Shaggedy: It's a huge, green, lizard-skinned creature that's half man and half monster and is about 8 ft tall. It has powerful arms, broad shoulders, a long tail like an alligator, it stands on two legs that are taller than any other man, a huge head, an ugly face, gross and deformed faces, larger hands and feet like a man and reptilian skin. The Shaggedy lives in a cavern in the deepest water. Down so far underwater, no one has been able to see anything but the purest blackness. It can separate it self into two blonde boys named Zeke and Decker. Also there is a way to summon it: you need a piece of black paper, 48 drops of blood, and you have to called out its name at least 10 times. It appears in Here Comes the Shaggedy.
 * Shape-shifting Lizards: These lizards can shape-shift, but at the moment they are hatched from an egg they look like kids, and once they are older (say like 12) they eat meat and insects, have a scaly skin, and starts to walk like an actual lizard plus they might relax in sunlight or taking a nice hot shower, but by the time they are an adult they look like a humanoid (that's because it was balanced standing on its two hind legs and its fat tail) scaly-green lizard that is about 6 ft tall, has a warty head and a purple tongue, so the main protagonist and her dad are the shape-shifting lizards in The Lizard of Oz.
 * Shrunken Head: A green head which was given to Mark by his Aunt Benna in How I Got My Shrunken Head. The head grants him mystical powers.
 * Siren Beetle: It's a tiny beetle with a gigantic, trumpet-shaped mouth that makes so loud it'll make your head to vibrate. It appeared in The Creepy Creations of Professor Shock.
 * Skeletons: The living skeletal figures who have appeared in a number of books. Curly the Skeleton is perhaps one of the most well-known appeared in Tales to Give You Goosebumps.
 * Skeleton Dog: It's a Dog-shaped skeleton that's been brought to life by magic. It appeared in the 2018 film Goosebumps 2: Haunted Halloween.
 * Skull-Headed Spider: It's a Halloween decoration that has a skull on a spider, but it was brought to life by magic and it starts moving around. It appeared in the 2018 movie called Goosebumps 2: Haunted Halloween.
 * Skull Mask: This skull mask has is a whitish-yellow color. It has deep eye sockets, an open jaw, a hideous toothy grin, and cracks criss-crossed atop its head. It appeared in The Five Masks of Dr. Screem.
 * Slappy: A famous evil living dummy that was carved from a cursed coffin by an evil sorcerer in the late 1800s, and can be brought to life and put to sleep by saying "Karru marri odonna loma molonu karrano", which means "You and I are one now". Appeared in Night of the Living Dummy, Night of the Living Dummy II, Night of the Living Dummy III, Bride of the Living Dummy, Slappy's Nightmare, Revenge of the Living Dummy, Dr. Maniac vs. Robby Shwartz, Escape from the Carnival of Horrors, The Streets of Panic Park, Slappy New Year! and Son of Slappy as well as the stage play Screams in the Night and his very own series, "Goosebumps SlappyWorld". He is also the main antagonist in the Goosebumps film where he's voiced by Jack Black, who also played R.L. Stine and voiced Brent Green from My Best Friend Is Invisible.
 * Snappy: Slappy's identical evil twin brother, he appeared in I Am Slappy's Evil Twin.
 * The Snake Lady: A snake-like lady who appeared in Escape from the Carnival of Horrors. She is one of the exhibitions int he carnival's Freak Show. She is described as a yellow haired woman with a serpentine body, however, if the reader encounters her, she is inexplicably changed to a human lady, with actual snakes wrapped around her. The good news is, she tells the reader where they are. The bad news is, she fools the reader.
 * The Snake Man from Saturn: He is a tall masked man, dressed in a tight costume of green and yellow, and on his mask there are two curled white fangs that was covering his face except for his eyes and mouth, and when he opened his lips he has a black forked tongue, and his eyes are a greenish yellow. Also he wields a slender rope called Wonder Web. He appears in Dr. Maniac Will See You Now.
 * The Snatcher: a shape shifting ghost from Return to Ghost Camp. it can take the form of anything it wants, and it snatches the campers of Camp Full Moon.
 * The Snowman: A demon accidentally created by a wizard named Conrad and his deceased wife. They transformed it into a snowman with a scar on its right cheek, and then trapped it inside a mountain cave in the town of Sherpia and the only way to free it is by reciting this poem "When the snows blow wild, And the day grows old, Beware, the snowman, my child. Beware, the snowman. He brings the cold. When the snows melt And the warm sun is with thee, Beware, the snowman --- For the snowman shall go free!". Appeared in Beware, The Snowman.
 * The Sorceress: A wicked practitioner of magic in The Knight in Screaming Armor. She got angry at Sir Edmund Saxton after he killed off her favorite pet dragon. As payback, she crafted a suit of black armor and possessed it with the spirit of a villainous knight, which came alive during the night and killed off Sir Edmund and his family (except for one son, who had been out hunting at the time). The reader confronts the Sorceress in her domain, and (if the right path is chosen) defeats the Knight. It seems the Evil Knight is somehow connected to the Sorceress' powers, because after the Knight is defeated, the Sorceress loses her powers.
 * Spacemen: They're these tiny alien from outer space. They're about as tall as a grass, wore a puffy silver suits and round white helmets with shaded visors, and if you see through their visors they have a weird face (beady little eyes, a button nose, and a smile on its tiny mouth) with bright-red hair growing all over it, and they wielded these tiny ray gun that fired a ray of blue. They appeared in the short story called Aliens in the Garden.
 * Special Agent Bendrey: A secret agent who appears in the book Secret Agent Grandma. Depending on which route the reader chooses, he may be friendly or hostile. At one point in the story, he reveals that he doesn't investigate aliens. Instead, he is an alien who investigates.
 * Spider Monster: It's a spider that is about the size of a German shepherd. It appeared in Little Comic Shop of Horrors.
 * The Spitter: It's a creature that has a body of a slug and a head of a giant squid, and it fired a big gob of goo from it's mouth that contains acid. It appeared in Little Comic Shop of Horrors.
 * Splatters: Super-intelligent insect creatures trying to take over an alien planet in Earth Geeks Must Go! They are so-called because they are balloon-like and are easily popped, through physical pressure or high-pitched noises.
 * Spyder: A computer virus that appeared in It Came from the Internet. It erases people's memories, and the reader must find a away to delete it before it causes havoc.
 * Squid Twins: They are a pair of enormous squids named Squeezer and Squisher. They have fat bodies, tentacles that are dark brown covered with pink suction pods also it looks like tree branches, and a pair of bulgy eyes. The Squid Twins can squeezed their enemies to death and then battled each other to see which squid would them whole. They appeared in Dr. Maniac Will See You Now.
 * Squirrel-Dog: It's a hybrid creature that has a body of a dog which is as big as a German Shepard and the face of a squirrel, also its the only creature (besides the beasts) that can talk. It appeared in The Beast from the East.
 * Stelks: They are silent yet slender corn stalk-like creatures. They have slender, dark bodies that are both smooth and shiny, slender hand which are found inside the stalks, and smooth/leafy green heads that has no features and no faces. They appeared in Be Afraid – Be Very Afraid!.
 * Stone Beast: Its a kind of mutant cat creature that looks like hideous gargoyle carved out of white stones. It has crazy, bulging eyes and long, sharp teeth and yes its alive! it appears in Deep in the Jungle of Doom.
 * Stone People: A long-forgotten race of cave people encountered in Deep in the Jungle of Doom. They have large eyes, heads with green mossy hair, and bodies covered with rock-like scales.
 * The Strangler: A wax figurine of a serial killer who strangles the life out of his victims. Appeared only in Welcome to the Wicked Wax Museum.
 * Stuffed Pig: It's talking toy stuffed animal that comes to life at night at the toy factory. It appeared in Toy Terror: Batteries Included.
 * Super Computer: An evil computer who takes over the whole Hall of Incredible Science and manages to destroy the reader. In one point of the story, the Super Computer takes the form of the dragon. The Super Computer appears in Into the Jaws of Doom.
 * Susie Snowflake: The sickeningly sweet heroine from a cheesy Christmas movie called, A Holly Jolly Holiday, which is available on a cursed video with weird results that brainwashes anyone into looking and acting like her. Seen in the Goosebumps short story, A Holly Jolly Holiday. Possibly inspired by the popular Christmas song of the same name.
 * Swamp Monster: A member of a race of swamp creatures, living in a swamp in southern Georgia. The creature is described as being almost ten feet tall, resembling a gorilla, but with a reptilian face and jaws, and with vines tangled in its fur. It wandered into the home of an elderly couple, who trapped it in one of their spare rooms. It stayed there for a few weeks, being fed by its captors, until it was accidentally freed by their granddaughter Gretchen and her stepbrother Clark. After escaping, the monster attempted to eat them, but when it tasted Gretchen, it revealed it could talk, and that it was allergic to humans, after which it dropped dead. It appeared in How to Kill a Monster.  There is also another Swamp Monster in Escape from the Carnival of Horrors, but is mistaken for a costume.
 * Sybil Wicked: A living wax figure. She was the most beautiful creation of Dr. Izzy Wicked. But her original face was burnt off by a fire, and she now seeks to replace it with someone else's. She currently has a patchwork face over her creepy-crawly infested one. A bunch of wax figures that look just like her are stashed away in a private storage room. She becomes angry after the reader ruins them, and seizes them to try and remove their face with a machine called the "Face Lifter". When she gets too close to a Suction Screen, her patchwork face comes off. If the reader doesn't have a mirror on them, Sybil steals her or his face. If they do, Sybil melts after seeing her own hideous reflection. Sybil appears in Welcome to the Wicked Wax Museum.

T

 * Terry Tadpole: He is an insectivore mutant tadpole that is a sidekick of Captain Croaker. Unlike the tadpoles that are in the life cycle of a frog he can walk on land. Just like Captain Croaker he too wears the same costume that is dressed in my favorite color green. He appears in Dr. Maniac Will See You Now.
 * Three-faced Clock: A futuristic clock that Kip, Abbey and the reader find in a museum in The Knight in Screaming Armor. This square diamond-shaped clock face has a shimmering chrome frame and has three smaller clock faces on it. One face is round, silvery green, has wavy silver hands, and turns time backwards. Another is round, hot pink, has straight black hands, and moves time forwards. The last one is fiery orange, shaped like an octagon, has no hands at all, and stops time cold. Turning the hands on the green clock face ends up with the reader and their cousins getting turned into babies. Turning the hands around on the pink clock face will result in the reader and their cousins getting turned into elderly citizens. Touching the handless orange clock face results in everyone (and everything) getting frozen in time.
 * Three-headed Gardener: An ancient wizard gardener with three ugly heads. If the reader encounters him, they suffer one of three different fates along with their cousins, Kip and Abbey: being turned into birds, becoming flowers in his garden, or merging together into a single three-headed person. This decrepit old gardener appears in The Knight in Screaming Armor.
 * Tiger Skeletons: They're a pair of tigers reanimated into a skeleton, so good news is that they don't have stomachs, but the bad news is that they still have all their teeth. The bones of the tiger are frail and decaying, but they glow with a ghostly iridescence. The tiger's tail whips from side to side, clattering like a rattlesnake and giant jaw that doesn't roar. They appeared in Deep in the Jungle of Doom.
 * Tikis: Living statues the reader encounters in The Twisted Tale of Tiki Island. They are angry with the reader since they have taken the Tiki Eye, their most sacred relic.
 * Time Police: A group of police officers whose duty is to ensure that nobody tampers with time. They appear in Danger Time.
 * Tongue Thing: This slimy creature from One Night in Payne House resembles a bunch of tongues. How it responds depends on which path the reader chooses.
 * Toobah: A wart-covered genie whom the reader may or may not encounter in Scream of the Evil Genie. He has bad breath and moss-coated teeth. If the reader takes his advice, he poofs them back home. If the reader takes chances with him, he summons several rattlesnakes.
 * Toy Ninjas: A bunch of 15 inches high action figures that comes to life at night at a toy factory, and they have every ability of a ninja. They appeared in Toy Terror: Batteries Included.
 * Toy Soldiers: A bunch of action figures that comes to life at night at a toy factory. Their weapon of choice is a can of instant spider web. They appeared in Toy Terror: Batteries Included.
 * Trap Toys: Inventions of Professor Darius in the Alternate Universe known as Truant. Used to capture children to send them to the prison complex known as "School." Some have been captured by the Children's Resistance Front and reprogrammed to dispose of traitors. They are seen in Elevator to Nowhere.
 * Tree Monster: It's a very tall tree with a dozen of sturdy branches that sprang from its sides and each branch has a big strong knot at the center of it and they are covered with tiny golden leaves. It's very strong, ticklish and alive. It appears in The Beast from the East.
 * Trick-or-Treat Ghoul: It's a kind of green-headed ghoul that says "trick or treat" before it starts to tackle a person. It has blazing red eyes that are dripping with goo, a pig-like nose, scraggly hair sticking out over big pointed ears, the face was pocked and bumpy, a pair of big bare feet, a fat big lip and if you look a bit closer you could see long dark hair sprouting from his nose. It appeared in a Weirdo Halloween.
 * Tug-of-War Snake: A piece of rope that when you pulled on it even harder it'll transform into a six-foot-long snake. It appeared in The Wizard of Ooze.
 * ​Tuttan-Rha':'  ​An ancient egyptian who kept himself alive by eating the preserved innards of the mummies he keeps locked up. He appeared in ​Who's Your Mummy? 

U

 * Uncle Jerry: He's one of the scientist that's been transformed into a cottonmouth snake. He appeared in Welcome to Camp Slither.
 * Undead Ed: Ed the ghoul (a type of shadowy zombie) appears in Lost in Stinkeye Swamp. He got lost in the sewers where he worked and died in the tunnel twenty years prior to the story, and lives in an old work site. He waits for any prey to come his way to feast on them. When a victim comes, his disguise melts off, revealing his true self. He uses a big steel crowbar as a toothpick when he's done, since he still believes in good dental hygiene.
 * Undead Pirates: Spanish conquistadors the reader encounters in The Twisted Tale of Tiki Island. Also, in Creep from the Deep Captain Ben and his crew are a group of zombie pirates.
 * The Unloved: They are a collection of twelve hideous, living masks who desire to possess their wearer, passing on their characteristics onto them. They appear in The Haunted Mask, The Haunted Mask II, and Goosebumps Wanted: The Haunted Mask.

V

 * Vampires: Appear in several of books, such as Vampire Breath, Invaders from the Big Screen, and Please Don't Feed the Vampire!.
 * Vampire Chicken: Freakish blood-sucking chickens the reader encounters at one point in The Curse of the Creeping Coffin. One of them drinks the reader's blood.
 * Vampire Parrot: It's a kind of parrot that drinks blood, and it's very chatty. It appeared in Please Don't Feed the Vampire!
 * Vamporilla: A cross-between a vampire bat and a gorilla. Seems to live inside a padded room opposite the waiting room at a laboratory, and is violent enough to kill any intruders, very painfully. It is never revealed how this creature came into existence, but is most likely one of Dr. Eeek's experiments, as other hybrids (such as dog/humans) have been created by him. Seen in The Deadly Experiments of Dr. Eeek.
 * Vanessa the Mystic: A mysterious woman who lives on the other side of town. She's a stickler on good manners, and changes anyone whoever doesn't say "sorry" to her. She appears in Chicken Chicken.
 * Victor Frankenstein: Victor Frankenstein is a robot that looks exactly like Kat's uncle, but to tell them apart is that the robotic Victor Frankenstein has a switch on his ankle. Victor appears in Frankenstein's Dog.
 * Visible Man: A man with no skin, who is controlled by the Super Computer, and prevents the reader from leaving the third flaw. He's really a science display that has been brought to life, and tends to strangle his victims. He does not have eyelids, so he doesn't close his eyes when he needs to, which is a weakness that the reader should expose. He appears in Into the Jaws of Doom.

W

 * Wartlock is a strange mutant creature who appeared in the video game Attack of the Mutant. His body is coated in yellow bumps, and he has a slightly smaller head near the one on his shoulders. He has enslaved bunches of "toadies" (toad-like creatures) to gather odd fruit for him. He uses a paint gun to vaporize any who mess up. He finally gets defeated when the player uses his paint gun to send him plunging into a poisonous river.
 * Weirdo (Bim): An orange alien found by Meg and her brother Chris. He made them give him back rubs. Later on they make him mad, and just before he kills them he sees a toy that was his. He took it and left. Appeared in Weirdo Halloween.
 * Werewolves: Monsters who appeared in the Goosebumps books, The Werewolf of Fever Swamp and Werewolf Skin. They also appear on Give Yourself Goosebumps books, Night in Werewolf Woods', The Werewolf of Twisted Tree Lodge, and All-Day Nightmare', in the Goosebumps Series 2000 books, The Werewolf in the Living Room, Full Moon Fever and Jekyll and Heidi, and in various short stories.
 * Wicked Clowns appear in Trapped in the Circus of Fear. These unfriendly entertainers either want to turn the reader and their friends into clowns or else kill them in the act.
 * Will Blake: A 12 year-old boy who is actually a werewolf. He appears in The Werewolf of Fever Swamp.
 * Wind Spirit: A wind elemental being who appears in Into the Twister of Terror. It resides within a twister tornado that picks up the reader. How the Wind Spirit reacts depends on which path the reader chooses.
 * Winged Pumpkins: They're a bunch of Jack-O'-Lanterns with silly faces, but once Slappy brings them to life, they sprout wings from their sides so they can fly into the sky. They appeared in the 2018 film Goosebumps 2: Haunted Halloween.
 * Wolf Boy and Wolf Girl: Two werewolves made for an amusement park. They appeared in A Shocker on Shock Street.
 * Giant Worm: Some worms started torturing a boy named Todd. Then they began to appear everywhere. Finally, he found out his sister was tricking him, so he plotted his revenge. Then a giant worm popped out of the ground and grabbed him, but a giant robin (which was really paper mache) scared the worm away. The worm appeared in Go Eat Worms!

X

 * Xentronians: Aliens who run Camp Running Leaf, who appeared in Escape from Camp Run-For-Your-Life. In some instances, they brainwash the reader, enslave the reader on their planet, or just flat out exterminate humanity.

Y

 * Yves Yaboum: Also known as Professor Y, he is the leader of the Y's Guys in Little Comic Shop of Horrors. His hairdo acts like extending tendrils, which he uses against the reader (he thinks that the reader is an evil spy).
 * Countess Yvonne: A vampire Countess who appeared in Please Don't Feed the Vampire! The reader may or may not encounter her, depending on which way they take. In one point of the story, the reader licks the blood off of her face and is told to close the book, since it is "not normal to drink blood".

Z

 * Zodiacs: An organization of twelve beings, each of whom represent the twelve astrological signs. Depending on the reader's horoscope in real life, they either help you or kill you. These beings appear in the Give Yourself Goosebumps book, Danger Time.
 * Zoe is a rat-like hippie who appears in Attack of the Beastly Babysitter. She is working for KidsCare and takes care of you and your brother, "Stinko".
 * Zombies: The walking corpses of the dead. They appeared in many of the Give Yourself Goosebumps books, such as Escape from Camp Run-For-Your-Life and Zombie School. They also appear in the Goosebumps book, Welcome to Dead House, in the Goosebumps Hall of Horrors book Why I Quit Zombie School and in the Goosebumps Most Wanted book Zombie Halloween.
 * Zombified Students: They're a bunch of undead students that if they injured themselves they'll be taken to the reviver to get themselves all fixed up. They'd appeared in Why I Quit Zombie School.
 * Zorax: A mutant monster who appeared in the video game Attack of the Mutant. The player first encounters him in an elevator. The player backs up into the storage room, but finds a hammer, and throws it at the monster, causing him to break up into several smaller versions of himself. Later, when the player enters the comic room, Zorax reassembles himself. The player finally manages to knock him back into the printing press, shutting it down.
 * Zorgs: Monstrous toys who appear in the Give Yourself Goosebumps book, Toy Terror: Batteries Included. They rip up their victims' faces so they can get to their brains.