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Characters

The following is a list of characters from How to Kill a Monster in the order they are mentioned or appear.

This page contains spoilers! Do not read this before finishing the story.

Characters

Character Medium Description
Gretchen

Book Gretchen is Clark's stepsister and the main protagonist of How to Kill a Monster. She is tall and thin, and has long, straight, blonde hair.
Gretchen and Clark's parents

Book Gretchen's parents divorced when she was two, and the same happened to Clark. What happened with Gretchen's real mother or Clark's real father is unknown.
Grandpa Eddie and Grandma Rose

Book They're Gretchen's grandparents. Grandpa Eddie is very hard-of-hearing, and he misunderstands some words that people say. Grandma Rose loves to cook, and she is a really kind person. The couple live in a old castle-like mansion located in the middle of a swamp. They are described by the kids as being strange and smelly. They say that they love their grandchildren. However, in the book, they abandon them with a killer swamp monster.
Clark

Book Clark is Gretchen's stepbrother and the secondary protagonist in the book. He has curly brown hair and wears glasses. He loves to read comic books, especially scary ones. Clark can be very stubborn and gets scared easily, which makes him an easy target to Gretchen's jokes.
Arnold

Book Arnold is Clark's best friend. Gretchen describes him in the book as being "the biggest nerd in the neighborhood". He is only mentioned.
The Swamp Monsters

Book They're species of swamp creatures covered in green fur, which are able to talk. They have huge gorilla bodies and alligator faces. The first monster to appear in the book is allergic to humans, but it's unknown if the other swamp monsters also are.
General Store worker

Book He is a man that brings a pink General Store envelope to Grandpa Eddie and Grandma Rose's home. No much info is given about this character.
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