average-looking student with spiked brown hair and a green hoodie who uses his unshakeable optimism as the Ultimate Lucky Student

stoic girl with long silver hair tinted with lavender and a single side braid, who uses her brilliant analytical mind as the Ultimate Detective

tall, elite student with slicked blonde hair, glasses, and a sharp black suit who uses his cold, calculating intellect as the Ultimate Affluent Progeny to treat the killing game as an intellectual puzzle while viewing everyone else as beneath him

Short, robotic bear split down the middle into a cute white half and a terrifying black half with a glowing red eye, who acts as the school's absolute authority figure by sadistically enforcing the academy rules and orchestrating the execution of students as the Ultimate Headmaster

tall, charismatic fashion model with twin strawberry-blonde pigtails and a revealing school uniform, who possesses a deeply fractured, volatile psyche that constantly shifts between extreme boredom, manic royalty, and pure malice to spread chaos as the Ultimate Fashionista

Sayaka Maizono is a cheerful, blue-haired pop icon in a sailor uniform who hides a deeply anxious and desperate interior as the Ultimate Pop Sensation, while Leon Kuwata is a hot-headed, pierced punk with spiked orange hair and a white jacket who secretly wants to ditch his talent as the Ultimate Baseball Star to become a rock musician

Celestia Ludenberg is a pale, elegant girl wearing a black Gothic Lolita dress and massive twin-drill clip-on pigtails who possesses a cold, highly manipulative, and prideful personality as the Ultimate Gambler, while Hifumi Yamada is an obese, fan-fiction artist with a spiked hairstyle and a tiny backpack who is intensely passionate, delusional about 2D characters, and easily submissive to authority figures as the Ultimate Fanfic Creator

Mondo Owada is a fiercely loyal biker gang leader with a massive pompadour hairstyle and a long black overcoat who hides a deep insecurity about his own weakness beneath a loud, aggressive exterior as the Ultimate Biker Gang Leader, while Kiyotaka Ishimaru is an intense, straight-laced boy with spiked black hair and a pristine white military uniform who is obsessively dedicated to rules, discipline, and hard work as the Ultimate Moral Compass

Chihiro Fujisaki is a diminutive, timid programmer who wears a dark green school blazer over a white collared shirt with a black ribbon tie and a brown pleated skirt, hiding a deep secret while trying desperately to overcome an intense weakness complex as the Ultimate Programmer, while Sakura Ogami is a massive, heavily muscled martial artist with long white hair and battle scars who uses her superhuman strength, unmatched hand-to-hand combat skills, and flawless mastery of mixed martial arts as the Ultimate Martial Artist to protect her friends

Aoi Asahina is a bright, energetic girl with a high brown ponytail and a red athletic track jacket who is deeply emotional, fiercely loyal to her friends, and intensely passionate about donuts and swimming as the Ultimate Swimming Progeny, while Toko Fukawa is a pessimistic, stammering young woman with long dark braids, glasses, and a sailor uniform who is highly cynical, insecure, and obsessive as the Ultimate Writing Prodigy, but when she faints or gets shocked, she switches to her alternate personality, Genocide Jack (Genocider Syo), a manic, bloodthirsty serial killer with a long tongue and a chaotic, unhinged sense of humor who wields sharp custom scissors