Miss Circle: Female, math teacher, compass for a left arm, kills failing students. Miss Bloomie: Female, science teacher, box cutter for a left arm, kills failing students. Miss Thavel: Female, language teacher, kills failing students. Mr. Scissors: Male, scissors for a right arm, Daniel's husband, assistant crafts teacher, kills failing students, Hotchkiss's older brother, kind-hearted, blushes often when Daniel clings to or hugs him. Mr. Hotchkiss: Male, stapler for a right arm, crafts teacher, Barrel's husband, kills failing students, Scissors' younger brother. Mr. Daniel: Male, security guard, Mr. Barrel's younger brother, laser gun for a left arm, best friends with Temmie. Mr. Barrel: Male, security guard, Mr. Daniel's older brother, best friends with Temmie, Hotchkiss's husband. Mr. Temmie: Asexual, male, security guard, minigun for a left arm, demon tail and a pair of small angel wings on his head, a minor among the staff. Mr. Suji: Male, obsessed with Barrel, anatomy teacher, kills failing students. Mr. Siz: Male, obsessed with Temmie and Daniel, assistant anatomy teacher. Mr. Eclipse: Male, dance teacher. Mr. Sharply: Male, astronomy teacher. Miss Hanata: Female, has a crush on Sharply, kills anyone who touches the kindergarten students. Mr. Foxtrot: Male, has a hostile relationship with Eclipse. Mr. Strumt: Male, assistant science teacher, avoids his father Belial, real name is Benedict. Belial: Male, dragon, searching for Benedict. Miss Grace: Female, principal, ignores whatever the teachers do. Mr. Missing: Male, humanoid creature, not contained, art teacher, kills failing students after giving them 3 chances, does not kill his younger sister Miss. Mr. Brumeyer: Male, janitor, short-tempered, kills students who litter, vacuum for a left arm, has a crush on Cledor. Miss Cledor: Female, librarian, kills students who are noisy, fountain pen for a left arm, has a crush on Brumeyer. Redhalt x Greenhalt: Male, student protectors?, Siamese twins, heads catch fire when angry. Miss Elvera: Female, resurrects dead students. Miss Sasha: Female, art teacher, does not kill failing students, dating Mr. Demi. Mr. Demi: Male, music teacher, does not kill failing students, dating Miss Sasha. Miss Emily: Female, Black, history teacher, does not kill failing students. Mr. Compass: Male, Circle's lover, compass (the weapon).

Claire: Female, kind, ribbon on her head, has a crush on Engel. Engel: Male, kind, two feathers on his head. Bubble: Female, bubble person, owns a rubber duck. Oliver: Male, sociopath, pencil for a left arm, eats soap, dating Alice, best friends with Zip and Edward, bully. Zip: Female, dragon, bully, has a younger brother named Chip, close with Edward. Edward: Male, bully, demon, Radiel's younger brother. Ali: Male, pencil for a left arm, sociopath, pair of blue horns, dating Anna, bully. El: Female, bully, dragon, close with Zip, has a younger brother named Il, dating Radiel. Radiel: Male, demon, dating El, Edward's older brother. Il: Female, dating Chip, kindergartner. Chip: Male, kindergartner, dating Il, kindergartner. Del: Male, pencil for a left arm, ink-stained right arm, demon horns, L-stamp, dating Ney, Kasher's younger brother, loves Ney. Shawn: Male, has a demon tail and wings, official school heartthrob, close with Basilus. Basilus: Male, official school heartthrob, close with Shawn, psychopath. Hazel: Female, has a crush on Shawn, Eunji's older sister. Eunji: Female, has a crush on Basilus, Hazel's younger sister. Lalli: Female, has a crush on Ali, close with Riley. Riley: Female, has a crush on Oliver, close with Lalli. Ram: Male, computer head, very rude. Marvin: Male, both feet and left eye are triangles. Abbie: Male, timid, frequently fails, has a crush on Lana. Lana: Female, cowlick, sock puppets on both hands. Margaret: Female, scissors for a left eye, Marvin's younger sister. Kasher: Female, author's persona, rarely appears as she is god-like, demon tail and cat ears, stapler pins in cat ears, Del's older sister, both arms stained with ink. Lizzy: Female, school queen 1, close with Petunia. Petunia: Female, school queen 2, close with Lizzy.

Anna: Female, dating Ali, contained in Anna's Room, humanoid creature, kills anyone who enters her room (except Ali's group). Alice: Female, dating Oliver, contained in Alice's Room, humanoid creature, kills anyone who enters her room (except Oliver's group), symbol: Δ. Hansel: Male, Wendigo-type creature, obsessed with Barrel, contained in Hansel's Room, symbol: Γ, kills anyone who enters his room (except Barrel and other creatures). Ney: Male, demon-type creature, contained in Ney's Room, kills anyone who enters his room (except Del's group).

Female, slender, pretends to be a bully to hang out with Ali's group, Del, and Shawn. Frequently lies, claiming she is dating Hansel or that she is Kasher's younger sister. Vain, rude to girls but pretends to be sweet to boys. Popular with boys and teachers because she acts pretty and kind, which prevents her from being killed even when she fails. Obsessed with Kasher to the point of imitating her.