Margaret: Female, 16, 157cm. Marvin's younger sister. Marvin: Male, 17, 165.1cm. Margaret's older brother. Skellie: Female, 16, 160.02cm. Skilled at crafts. Ram: Male, 18. TV head. A bully who likes graffiti. Jealous of Barrel. Basilus: Male, 15. Popular bully. Extremely jealous of Barrel. Robert: Male. Half of his face is robotic. Reticent. Edgar: Male. Reticent. Member of the occult group. Gregory: Male. Wears a cloak and mask. Loves horror. Part of the occult group. Wilbur: Male. Searching for the Necronomicon. Member of the occult group. Akatsuki: Female. Believes in God. Member of the occult group. Muro: Male. A shark beastman wearing a tube. Likely has a generic personality. Fufu: Female. A hamster beastman with a cute appearance. Eunji: Female. A fan of Basilus who treats him like a king.

Barrel: Male security guard, 518cm. Hotchkiss's husband. Guards failing students. Hotchkiss: Male craft teacher. Dating Barrel. Kills failing students. Brummeier: Male janitor. Smoker. Kills students who litter. Strontium: Male. Wears a gas mask. Chemistry teacher/Science assistant. Tron: Male. Cute robotics teacher. True form is a blue slime. Shapley: Male astronomy teacher. Always has a smiling expression. Foxtrot: Male dance teacher. Bright personality. Kills failing students. Bogurus: Female swimming teacher. A large sea serpent monster. Eugene: Male PE teacher. Black. Left arm is a golf club. Vane: Male vice principal with a halo on his head. Cledor: Female librarian. Kills students who make noise. Elvara: Female school nurse. Can revive the dead. Greenmile: Male. Conjoined twin attached to Redhalt. Redhalt: Male. Conjoined twin attached to Greenmile. Hinata: Female religious studies kindergarten teacher. Has a crush on Shapley. Missile: Male military science teacher. Member of the Scavengers. Seize: Male anatomy teacher. Has a crush on Barrel. Enterprise: School bus teacher. Often lost in daydreams. Ashachu: Female school cafe owner. Can make 12 types of drinks and more. S.B.B.M: School canteen owner. Seems to be themed after a chicken.

Claire: Female, 15, 160cm. Bright personality. Engel: Male. Kind personality. Has a feather on his head. Bubble: Female. Energetic personality. Hair and tail are soap bubbles. Lana: Female. Wears sock puppets on both arms. Playful personality? Abbie: Male. Has an apple stem on his head. Timid personality. Oliver: Male. Alice's boyfriend. A bully. Edward: Male. Friend of Oliver and Zip. A bully. Zip: Female. Friend of Oliver and Edward. A bully. Petunia: Female. Rabbit appearance. The popular girl. Lizzy: Female. Has demon horns. Popular girl alongside Petunia. Kevin: Male. Model student. Smart. Afraid of nothing. Kirby: Male. Has a cat-like form. Quiet personality. Robbie: Male. Model student. Wears glasses. Quiet and calm. Riley: Female. Has a crush on Oliver. A psychopath. Ruby: Female. TV head. Bright personality. Skell: Male. Phone addict. Dark personality.

Miss Circle: Female math teacher. Kills failing students with a compass arm. Miss Thavel: Female language teacher. Kills failing students with creature-like arms. Miss Bloomie: Female science teacher. Kills failing students with a box cutter arm. Miss Emily: Female history teacher. Does not kill failing students. Kind. Miss Grace: Female principal. Does not kill failing students. Serious. Mister Demi: Male music teacher. Timid and kind. Miss Sasha: Female art and kindergarten teacher. Kind.

A female student who is poor at studying. She hates women and is obsessed with men. She is a bad actress and doesn't realize the other kids dislike her.

Hazel: Female. Doesn't attend school. Edgar's best friend. Cares a lot about the occult group. Feels no fear. Belial: Male dragon. Searching for his son. Alice: Female. Occasionally comes out of the isolation room. Dating Oliver. Hansel: Male. Stays in the isolation room. Obsessed with Barrel.