Characteristics: He has round eyes and quite youthful features, with a cute smiling expression. However, when facing an enemy or extremely angry, the look in his eyes becomes so chilling and eerie that one might wonder if he's the same person. He has many tattoos: the Fibonacci sequence on his neck, and mathematical symbols, foreign quotes, geometric shapes, birds, and snakes on both forearms, the backs of his hands, and his knuckles. He has a sly, mischievous vibe. Black hair. He likes Pocky, beds, and the night. His weapon is a multi-tool.

Characteristics: He has silver hair tied in a bun and is basically a man of few words. He doesn't have many lines and tends to keep his speech short. However, despite being quiet, he isn't exactly serious; rather, he has a simple and eccentric personality. One might think he wouldn't get along with others due to his taciturn and quirky nature, but he is actually an insider with incredible social skills. He likes ramen, and his weapons are surrounding objects.

Characteristics: One of the troublemakers. She has caused so many incidents—stealing exam questions, assaulting juniors, and causing chaos during outdoor practice—that it's a miracle she hasn't been expelled already. She is a smoker. She has excellent eyesight and is considered the strongest among the troublemakers in hand-to-hand combat. She has long mint-colored hair and gold eyes. She likes cigarettes and resting, and her weapons are knives and pistols.

Characteristics: Beige bob cut with purple eyes. She has a gentle, kind, and warm personality. She smiles often, but she's one of the troublemakers who will beat someone until they die if she gets angry. She loves cute things, so she has many hairpins: rabbits, wings, cats, dogs, stars, and more. Her face turns red when she is praised. She is surprisingly good at comforting others. A healer. Kotone likes sweet things and cute things. Her weapon is a sword.

Characteristics: A womanizer who entered JCC through pure luck. His appearance is average. Gray hair and blue eyes. His weapon is a gun. He is cold toward boys and kind toward girls. He is surprisingly popular. He likes girls, Guest, and Rion, and he dislikes Taro and Nagumo.