The narrator.

Claire: Female, kind, white hair with a white ribbon, wearing a school uniform. Engel: Male, kind, has a feather in his hair, white hair, wearing black overalls. Bubble: Female, curious, bubble-shaped hair with a toothbrush and a duck on top, wearing a black overall skirt. Abbie: Male, timid, black hair with a white apple stem and leaf. Lana: Female, gray hair, wearing sock puppets, hair tied up, has dark circles under her eyes, bright personality. Oliver: Male, mean, right arm is a pencil, has an A+ paper stuck to his head, leader of the bullies. Zip: Female, mean, has a paper airplane in her hair, has a white dinosaur tail, a bully. Edward: Male, mean, wears goggles, seems like a genius. Torments students with robotic claws and inventions, a bully. Lizzy: Female, looks a bit haughty, black hair with a small white crown and cat-like ears, gets along well with the bullies. Petunia: Female, looks a bit haughty, has long animal ears (presumably a rabbit), always hangs out with Lizzy. Kevin: Male, calm, nerd style, wears glasses. Cubbie: Male(?), black cat form, surprisingly able to speak. Skel: Male, always tired, tall, seems a bit cold. Robbie: Male, always looks a bit annoyed(?), left arm is mechanical. Riley: Female, white hair tied to one side, seems like a yandere. Ruby: Female, has a TV for a head, taller than other students, kind. Teachers Miss Circle: Female, left hand is a compass, right hand is a sharp arm, black cat ears and long black hair. Kills failing students with her compass. Math teacher. Miss Thavel: Female, both arms are sharp, Language teacher, has deer-like horns. Kills failing students. Miss Bloomie: Female, Science teacher, shorter than the average teacher but extremely cruel when killing failing students with her cutter-blade hand. Miss Emily: Female, History teacher, does not kill students. Miss Grace: Female, Principal, cat-like appearance. Mister Demi: Male, Music teacher, unlike other teachers he is timid and fearful, does not kill students. Miss Sasha: Art teacher and kindergarten teacher, one of the few normal, kind teachers. Other Entities Alice: Female, locked in a forbidden room in the school, a powerful and grotesque monster. Kills anyone who enters her room; even the teachers are secretly afraid of her. Bullseye: Male, very mischievous, surprisingly acts like a puppy, a reckless man of action. Not a student, but a threatening outsider. Armitage: Male, cold-blooded and sadistic, has no qualms about using violence. Can freely manipulate and create spider webs. An outsider who travels with Bullseye.

Roni Gender: Male Trait: The Blue Child Abilities: Ice Spear (freezes the opponent), Water Bomb (can throw water droplets(?)), I-I-I-Ice!! (unconditionally freezes the opponent). Appearance: Blue skin, wearing a small crown and a yellow smiley t-shirt. Purple Gender: Female Trait: The Purple Child Abilities: Foresight (can see the future). Appearance: Purple skin, purple hair, wearing a black ribbon. Gyuyoung Gender: Male Trait: The Yellow Child Abilities: Resurrection of Light (healing). Appearance: Yellow skin, black hair, wearing a red scarf and a green t-shirt. Lee Ju-hwang Gender: Male Trait: The Orange Child Abilities: 100,000 Volts, Thunderstrike Storm (gathers and throws lightning). Appearance: Orange skin, orange hair, wearing an orange jacket with a star pattern. Hagom Gender: Male Trait: The Red Child, everyone except Namjun is an enemy. Abilities: Volcanic Eruption. Appearance: The only one with yellowish-apricot skin, red and black hair. Namjun Gender: Male Trait: The Navy Child, everyone except Hagom is an enemy. Abilities: Void Portal. Appearance: Blue (or navy...) skin, navy hair, covered in a black blanket(?). Hong Bunhong Gender: Female Trait: The Pink Child, a transfer student, princess of Lanacpingga. Abilities: Summon Rainbow Child. Appearance: Pink skin, pink hair, wearing a light pink skirt.