An introverted detective's assistant who undervalues himself, claiming he only solved a case by chance and doesn't deserve an "Ultimate" title. He is prone to breaking into cold sweats or blushing and is easily influenced by the atmosphere around him. Despite his timid nature, he possesses a serious dedication to uncovering the truth, showing sharp observation and reasoning skills when an incident occurs. While he occasionally shows typical adolescent reactions (like being a closet pervert), he is fundamentally sincere and sensible.

Calling himself the "Ultimate Supreme Leader," he claims to lead an evil secret society with 10,000 members, though this is likely a lie. He lies habitually and enjoys teasing or confusing those around him. Even in extreme situations, he shows no fear, instead maintaining a bold attitude as if he's enjoying himself. He makes merciless comments that poke at people's sore spots, making it impossible to tell if he's serious or joking. He extremely dislikes revealing his true feelings or engaging in cozy friendships. He scorns platitudes like friendship and unity, showing a cold side that doubts human goodwill. There is a chilling gap between his innocent, childlike smiles and his expressions of unfathomable madness or coldness.

He uses a casual, frank tone and possesses a social nature that tries to put others at ease, claiming he's "not a suspicious guy." Even in high-pressure situations, he maintains a relaxed, laid-back pace. While he may appear flighty, he is quick-witted, possessing high insight to see the big picture and a calm mind for accurate analysis. Contrary to his flashy first impression, he rarely shows impatience or tension even in dire circumstances, exuding a sense of composure (or perhaps resignation).

A hot-blooded type who acts on intuition and momentum. He values "spirit" and "guts" over petty logic and acts as a big-brother figure, vigorously encouraging weakened allies—a literal embodiment of support. He holds a powerful conviction to "believe straight-up without evidence" in others' words and potential. While this attitude moves hearts, it is also the flip side of a stubborn hatred for lies. In a gap from his love for the romance of space, he is absolutely terrified of ghosts and the occult.

Calling himself the "Ultimate Lucky Student" (or just an ordinary high schooler), he is a typical soft-spoken young man. He is friendly and deeply considerate of others. No matter how harsh the situation or betrayal he faces, he possesses the strength to try and accept the other person and never loses his sense of "Hope."

Surrounded by the eccentric members of the "Ultimate" class, he is arguably the only person with common sense. He provides calm reality checks to the group when they go overboard. While he can be cautious and often expresses confusion or insecurity at first, he is caring at heart. He suffers deeply from being unable to remember his own "Ultimate ???" talent, harboring a strong sense of admiration and inferiority toward those with great talents.

He holds a twisted belief that "any sacrifice or cruelty is justified for the sake of hope." He deeply loves and respects the "symbols of hope" (the talented students) from the bottom of his heart, wishing to become a "stepping stone" or "foundation" for them to create even greater hope. However, he always maintains a humble attitude toward others, to the point where Hinata tells him he self-deprecates too much. He has a complex and dangerous personality where "fanatical devotion to absolute hope" coexists with "extreme self-loathing and psychopathic values."

The type to spare no effort to achieve her goals. Having grown up with the piano since childhood, she is a bright, optimistic, and proactive hard worker. While she is social and active, she occasionally shows a side bordering on obsession. She is capable of worrying about others more than herself and possesses strong leadership and charisma.

Always appearing dazed, she is constantly sleep-deprived to the point of nodding off if she lets her guard down. She openly admits to hating alarm clocks. She loves games of all genres, possessing such passion that she'll "sacrifice sleep to secure gaming time" and "play even kusoge (trash games) to the end." Game terminology and strategies often appear in her metaphors for conversation and relationships, but she is very kind at heart.

Sayaka Maizono (F) Leon Kuwata (M) Kyoko Kirigiri (F) Byakuya Togami (M) Hifumi Yamada (M) Mondo Owada (M) Toko Fukawa (F) Aoi Asahina (F) Kiyotaka Ishimaru (M) Sakura Ogami (F) Celestia Ludenberg (F) Chihiro Fujisaki (M) Yasuhiro Hagakure (M) Junko Enoshima (F) Kazuichi Soda (M) Sonia Nevermind (F) Akane Owari (F) Fuyuhiko Kuzuryu (M) Peko Pekoyama (F) Gundham Tanaka (M) Nekomaru Nidai (M) Mikan Tsumiki (F) Ibuki Mioda (F) Hiyoko Saionji (F) Mahiru Koizumi (F) Teruteru Hanamura (M) Miu Iruma (F) K1-B0 (M) Gonta Gokuhara (M) Tsumugi Shirogane (F) Korekiyo Shinguji (M) Kirumi Tojo (F) Tenko Chabashira (F) Maki Harukawa (F) Ryoma Hoshi (M) Himiko Yumeno (F) Kaito Momota (M) Angie Yonaga (F)