Claire: Female. A kind girl characterized by short hair and a ribbon on the back of her head. She has a cat named Moe Moe. Engel: Male. A kind boy with white hair and two feathers sticking out. He is close to Claire and protects her from bullies. Oliver: Male. A sociopathic bully leader with an A+ stamp on his head, black demon horns, and a pencil for a right arm. He is dating Alice and eats soap. Zip: Female. A bully with black and white hair, "2+2=8" written on her, and a white dragon tail. She traps weak students. Edward: Male. The brain of the bullies with long white hair, black demon horns, and goggles. A genius who invents cruel bullying devices. Abbie: Male. A timid boy who is bad at studying and has an apple stem on his head. Lana: Female. Abbie's precious best friend who carries sock puppets on both hands. Bubble: Female. A kind girl whose body is made of soft bubbles. Lizzy: Female. The school's popular girl with a ribbon in her hair, best friends with Petunia. Petunia: Female. A rabbit demi-human and popular girl who is best friends with Lizzy. Kevin: Male. One of the few model students and sane people in this school, wearing thick glasses. Cubbie: Male. A model student cat demi-human boy. Robbie: Male. Apathetic and lacks emotional ups and downs, finds interacting with others bothersome, and excels in engineering. Riley: Female. A yandere with a fanatical crush on Oliver. Ruby: Female. A kind girl whose head is a monitor. Skell: Male. Always looking at his phone as if he doesn't care about his surroundings. Margaret: Female. A lively girl with red scissors and dotted lines around her eyes. She is Marvin's sister and hates Ram intensely. Marvin: Male. Has a unique appearance with set squares on his feet. He always eats chocolate and confronts the bully Ram fiercely with his sister. Ram: Male. A vicious bully with a monitor head and a plug tail. He uses harsh profanity and insults parents, picking fights with the Marvin siblings. Bacillus: Male. An arrogant, wealthy bully wearing a crown with '1' on it. A popular white-haired boy who feels jealousy toward Sheriff Mr. Barrel. Scotch: Female. A blonde student in a pink maid outfit with an extraordinary talent for crafts and assembly. Robert: Male. A boy with half his face mechanized and a giant wrench for a right arm. Very blunt and focused only on mechanical engineering. Edgar: Male. An occult club member with sharp horns and long purple hair. Has a gloomy personality and draws bizarre doodles in his sketchbook. Gregory: Male. An occult club member wearing a torn cape and a ghost mask. A horror movie fanatic. Wilbur: Male. A hot-tempered 246cm giant in the occult club who always screams and carries the Necronomicon. Akatsuki: Female. A girl with long black hair who believes in supernatural gods even in this bizarre school. An eccentric occult club member. Ellie: Female. An alien girl with purple pigtails who is curious about space and the constellations in the night sky.

Miss Circle: Female. The math teacher with a compass for a right arm who loves Oreos. A powerful killer who hunts failing students. Miss Thavel: Female. The English teacher with grotesque hands who values discipline and executes failing students alongside Miss Circle. Miss Bloomie: Female. The cruel science teacher with a cutter blade for a left arm and a quiet, cold personality. Miss Emily: Female. The history teacher who wears glasses. She doesn't kill personally but remains a bystander even as students die. Miss Sasha: Female. A gentle and kind kindergarten/art teacher. Mr. Demi: Male. The music teacher who is timid and cowardly, always intimidated by the murderous teachers and bullies. Miss Grace: Female. The principal who knows about the slaughter in the school but overlooks it, caring only about maintaining order.

Male. A jellyfish demi-human with mint-colored short hair and small fins by his ears. He is lively and has incredibly long arms and hands made of fins.

Female. Has long mint hair and round glasses. She wears a nun's habit and cap with a large cross around her neck. A smart student, but extremely critical and prickly.

Female. Has messy short black hair and black rabbit ears. Wears a torn black sleeveless shirt, and her arms turn blacker toward her hands. In her transformed state, her whole body is covered in black fur and only her eyes are red. A contained creature and Jack's girlfriend.

Male. Has a short haircut that is black on the bottom and white on top with black eyes. Has pointed elf ears with a black piercing in one, wearing a white short-sleeved shirt, navy vest, and navy tie. Bella's boyfriend.

Female. Has short brown hair, a black ribbon, and a silver crown. Wears a red triangle necklace, a torn light blue top, and a long black skirt. When transformed, her whole body turns black with tentacles and red eyes. Oliver's girlfriend and a contained creature.

Male. Has long blonde hair, black eyes, deer antlers, and a flower crown. Transforms into a monstrous form. Originally friends with Mr. Barrel, but is now obsessed with him. A contained Wendigo.

Female. Thinks she is beautiful. She is boy-crazy and loves men, especially jealous of pretty girls whom she tries to imitate. She acts incredibly kind, babyish, and pretty in front of men, but no one falls for it. Even the teachers avoid her. She acts like a model student but her grades are F-.