Miss Circle: Female math teacher. A strict disciplinarian. Loves Oreos. One arm is a compass. Height: 290cm. Miss Bloomie: Female science teacher. Height: 170cm. Quiet. One arm is a box cutter. Miss Thavel: Female language teacher. Both arms are creature-like. Height: approx. 200cm. Energetic. Miss Grace: Female principal. Strict and quiet. Height: approx. 200cm. Miss Emily: Female history teacher with dark skin. Everyone calls her a fool. Miss Sasha: Female art or kindergarten teacher. Kind and friendly. Mister Demi: Male music teacher. Timid. Mister Barrel: Security guard. Height: 518cm. Timid and kind. Tries to protect failing students. Has a monitor for one eye that displays emotions via emoticons. One arm is a minigun. Friendly and cheerful, but extremely cruel to outsiders. Mister Hotchkiss: Male craft teacher and Barrel's husband. Cold. One arm is a stapler. Mister Sharply: Male astronomy teacher. Always wears a cheerful smile. Pleasant. Mister Foxtrot: Dance teacher. Height: 414cm. Abnormally large hands and joints that bend unnaturally. Extremely flexible and cheerful. Miss Elvara: Female health teacher. Kind and quiet. Can bring the dead back to life. Height: approx. 200cm. Miss Cledor: Female librarian. Will kill anyone who talks in the library. One arm is a large key. Height: approx. 200cm. Mister Bane: Male vice-principal. Height: 357cm. Mister Brumeyer: Male janitor. Will kill anyone who litters on the floor. Strict. One arm is a vacuum cleaner. Height: 320cm. Mister Sieze: Male anatomy teacher. Obsessed with Barrel. Greenmile & Redhalt: Male conjoined twin security guards. Estimated height: 280cm. Greenmile is kind and energetic; Redhalt is quiet and blunt. Can summon guns.

Claire: One of the main protagonists. A hardworking, ordinary, and good-hearted student. Abbie: A timid student who struggles with studies but loves learning. Engel: A kind and righteous student who is close to Claire. Bubble: A kind and exemplary student with a head made of bubbles. Lana: A pure-hearted student close to Abbie who tries her best to study. Oliver: A troublemaker, leader of the bullies, and the principal's lover. Zip: Oliver's friend, a girl who loves playing pranks. Edward Kevin Petunia Lizzy Cubbie Robby Riley Ruby Skell