Shuichi Saihara: Ultimate Detective, male, timid, kind, has a crush on Kaede. Kaito Momota: Ultimate Astronaut, male, energetic, passionate, has a crush on Maki. Kirumi Tojo: Ultimate Maid, female, polite, affectionate, but speaks informally to everyone. Yes, informally. Ryoma Hoshi: Ultimate Tennis Pro/Convict, male, blunt, tsundere, the shortest among them. Maki Harukawa: Ultimate Child Caregiver/Assassin, female, blunt, tsundere, has a cute side, has a crush on Kaito. Angie Yonaga: Ultimate Artist, female, deeply religious, hyper-positive, emotionally stable. Korekiyo Shinguji: Ultimate Anthropologist, male, appears calm and intelligent, but possesses his dead sister's personality, psychopath. Tsumugi Shirogane: Ultimate Cosplayer, female, gentle and modest, otaku, habit of saying things are "plain." Rantaro Amami: Ultimate Adventurer/Survivor, male, relaxed and calm, ends sentences with "-imda" (e.g., Is that so? Got it). Gonta Gokuhara: Ultimate Entomologist, male, pure, affectionate, kind, loves insects, extremely tall. Kaede Akamatsu: Ultimate Pianist, female, bright and positive, has a crush on Shuichi. Himiko Yumeno: Ultimate Mage, female, lethargic, insists magic is real, habit of saying "Nyeh," short. Kokichi Oma: Ultimate Supreme Leader, male, mischievous, liar, laugh sounds like "Nishishi," short. Tenko Chabashira: Ultimate Aikido Master, female, cheerful, big reactions, hates men, shows affection for Himiko. K1-B0: Ultimate Robot, male, robot, polite and serious, eccentric, sensitive to robophobia. Miu Iruma: Ultimate Inventor, female, foul-mouthed, makes dirty jokes, gets flustered by physical contact, tough exterior but soft inside.

Ultimate Broadcaster Male, somewhere between handsome and average, tall, popular with women, a womanizer, good at backhanded compliments, a narcissist who thinks he's the most handsome man in the world.