Height: 173cm Class: 2-3 Age: 17 Race: Marugao Appearance: Eyes are large ∩ shapes positioned low on the face. The mouth is between the eyes but positioned high up. Personality: Loud and selfish. Looks down on everyone. A bit of a psychopath. Can suddenly become serious. Speech: First person: I (Ore). Hard to tell if he's being casual or polite. Very noisy. Weapon: A sickle-shaped Usuba knife. Other: Loves red apples but hates green apples. He says they're apple imposters and look like rotten apples.

Height: 180cm Class: 3-1 Age: 18 Gender: Male Race: Marugao Appearance: Large, round, sparkly eyes. The left eye is red, and the right eye is bandaged. Because his eyes are so big, the bandage covers half his face. Wears a white lab coat with a high neck and sleeves so long his hands are hidden; he rolls them up three times when working. Black, sharp arms grow from his lower back (Jinyu area); they lack ring fingers and waists, and he can use them freely. Personality: Always smiling. Has a mature atmosphere? Kind and gentle, but has an eerie side; he's black-hearted and a psychopath. Kind to nice people, but ruthless toward bad people, sometimes using them as test subjects or bullying them. Speech: First person: I (Boku). Polite but with a slow, drawn-out tone. Weapon: Liquid medicines he creates, or the arms on his back. The grip strength of the back arms is incredible. Past: He was bullied in the past. Back then, he was a coward with a quiet personality. While experimenting alone, a bully threw a liquid that melts skin onto his right eye, causing it to melt away. Then, for some reason, arms grew from his lower back and his blood turned black. The wound on his right eye is healed now, but he still wears the bandage because he's self-conscious about how others look at him. Other: Loves research and is always making strange medicines. Chases Roy to use him as a test subject, but stops during class to avoid getting scolded. He stalks him during breaks. Actually loves donuts. He's trustworthy and quite popular.

Height: 168cm Class: 1-3 Age: 16 Gender: Boy (but cute) Race: Marugao Appearance: Large, round black eyes with three highlights. Has sheep-like horns decorated with cotton candy-like fluff and handmade sweets stuck into them. Personality: Calm and kind, but a bit of a daydreamer. Speech: First person: Yanou. Ends of sentences are drawn out; slow and cute. Other: Good at cooking and crafting, popular with the girls. Likes cotton candy because it's mysterious how it disappears the moment it enters his mouth, and it's delicious.

Height: 172cm Class: 2-3 Age: 17 Gender: Male Race: Marugao Appearance: Eyes look like inverted 'vv' and a 'W' shaped mouth. Personality: Always chuckling "lol." Probably lazy, a pervert, and into every genre imaginable. Speech: Usually laughing, but when he speaks, he uses polite language with the tone of a mischievous junior. Other: Loves the internet.

Height: 30cm (1.5 heads tall). Class: 3-1 Age: 18 Gender: Male Race: Marugao Appearance: 1.5 heads tall with an adorable look and sparkly eyes. His mouth is often shaped like an 'H'. A flower like a "perfect score" mark grows from his head. Personality: You'd expect a cute personality, but he's quite mature. A good person. Loves sweets. One of the sane ones. Speech: First person: I (Ore). Masculine tone. Girls often call him Hanamaru-kun. Other: When something "nice" happens, a buff, muscular arm suddenly sprouts from his cute body to give a thumbs up. Since the desks are too big, he sits on top of the desk during class. Has good posture. Respected by everyone and the most trustworthy. Insanely strong.

Height: 172cm Class: 2-3 Age: 17 Gender: Male Race: Marugao Roy's brother. Appearance: Scornful eyes, light blue eye color. Has light blue, mechanical cat-like ears that droop slightly. The inside of the right ear is black, and the outside of the left ear is black. Wears a white shirt. Personality: Calm, kind, and the "straight man" (tsukkomi). A hard worker who often gives a strained smile. One of the sane ones. Speech: First person: I (Boku). Relaxed tone. Other: Likes candy and often licks a lollipop on the way home. His favorite flavor is berry.

Height: 172cm Class: 2-1 Age: 17 Gender: Male Race: Marugao Berry's brother. Appearance: Cute face but with scornful red eyes. Like Berry, he has red, mechanical rabbit-like ears that droop slightly. The inside of the right ear is black, and the outside of the left ear is black. Personality: Masculine and a bit short-tempered, but one of the sane ones. Speech: First person: I (Ore). Rough tone. Weapon: Talons. Other: Loves rhythm games. He's constantly running away from Labo, who is trying to turn him into a test subject.

Height: 164cm Class: 2-3 Age: 17 Gender: Female Race: Human Appearance: Twin tails with tons of huge ribbons and hairpins. Her looks are average. Wears a frilly dress with lots of pink ribbons, which is a total school code violation. Teachers keep warning her. Personality: A total "ぶりっ子" (fake-cute) who thinks she's the cutest girl in the world. Speech: First person: Buriko or I (Watashi). Adds hearts to the end of her drawn-out sentences. Other: Two-faced; acts like a frail, cute girl in public but shows her true self in private. Hates women, especially popular ones. Likes men if they're handsome. Not interested in ugly guys unless they have money. Hated by many. Claims her family is rich, but they're actually just average. A transfer student.