Residents and Cameos
- Big Al - The owner of the park.
- Snake Lady - A reptilian creature that works in the dungeons.
- Madame Zeno - An evil fortune teller similar to Madame Doom. She is the one holding the freakshow inhabitants as her prisoners in the Carnival of Horrors.
- Dr. Frank N. Stone - An evil scientist. In one bad ending, he has two monsters that want to use the reader as their ball in their volleyball game.
- Blue-Horned Monster - An unnamed blue-horned monster with red eyes.
- Three-Headed Man - A three-headed man who is a member of the Carnival of Horrors' freakshow.
- Giant - A large man who is a member of the Carnival of Horrors' freakshow.
- Fat Lady - A fat lady who is a member of the Carnival of Horrors' freakshow.
- Mountain King
- Monster Blood (cameo)
- Slappy the Dummy (cameo)
Rides and Attractions
- Booger Bog
- Doom Slide
- Hall of the Mountain King
- Halloween Express
- House of Horrors
- Reptile Petting Zoo - A petting zoo filled with various reptiles. It is revealed that the Reptile Petting Zoo is for the reptiles.
- Right-Way Railroad
- Super Sonic Space Coaster
- Tent of the Living Dummies - A tent filled with sentient dummies.
- Some of the rides and even characters are similar to HorrorLand.
- The name "Carnival of Horrors" is in the Goosebumps HorrorTown 2019 Halloween event.
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