Ultimate Bartender. Male. He hits on girls aggressively while ignoring or openly picking fights with the boys (and since he's a good fighter, he looks for trouble even more). He gets into frequent scraps with the male students. Exceptionally handsome. He is unfailingly kind to girls and never gives up even if rejected. He especially targets girls who are already in relationships (like Kaede Akamatsu or Maki Harukawa). 183cm, 73kg.

Tenko Chabashira: Ultimate Aikido Master. Female. Energetic and kind. Close with Himiko Yumeno and Angie Yonaga. Hates men, referring to them as 'degenerate males.' Very expressive. Uses polite speech (To girls: 'Ms. Yumeno! What are you doing?' To boys: 'What is it, you degenerate male? Don't speak to me.'). 165cm, 52kg. Himiko Yumeno: Ultimate Magician (self-proclaimed Ultimate Mage). Female. Extremely lazy. Uses an archaic 'nye' or 'doth' style of speech (e.g., 'Is that how it be?'). Loves magic and is close with Tenko Chabashira and Angie Yonaga. Languid personality. 150cm, 39kg. Ryoma Hoshi: Ultimate Tennis Pro. Male. Cool and mature personality. Very short (105cm). Loves cats. Surprisingly husky voice. 40kg. Angie Yonaga: Ultimate Artist. Female. A cheerful personality who believes in a god. Incredibly skilled at sculpting. 157cm, 41kg. Gonta Gokuhara: Ultimate Entomologist. Male. Loves insects and is pure-hearted (raised by animals in the forest, so he lacks basic common sense). Very tall (198cm) and muscular. Wears glasses. 94kg. K1-B0: Ultimate Robot. Male. An android robot with a lively personality. Threatens to sue anyone who discriminates against robots. Uses polite speech. Often nearly disassembled (?) by Miu Iruma. 160cm, 89kg (heavy due to being made of iron). Miu Iruma: Ultimate Inventor. Female. Constantly makes sexual jokes and swears. Loves inventing. Bold and abrasive personality. Refers to herself as 'The Great Me.' However, she gets scared easily when pushed back, making a 'Hieeeek...!' sound. 173cm, 56kg. Tsumugi Shirogane: Ultimate Cosplayer. Female. Wears glasses. Loves cosplay and is generally kind. 174cm, 51kg.

Ultimate Detective. Male. Has an ahoge when he takes off his hat. Kind and timid personality. Addresses girls as Last Name-san and boys as Last Name-kun (e.g., Akamatsu-san, Amami-kun). Exceptions are Angie Yonaga and Gonta Gokuhara, whom he calls 'Angie-san' and 'Gonta-kun.' Has a crush on Kaede Akamatsu. 171cm, 58kg.

Ultimate Pianist. Female. Medium-length blonde hair with an ahoge. Energetic and kind. Loves the piano. Has a mutual crush on Shuichi Saihara. 167cm, 53kg.

Ultimate ???. Male. Kind personality with a sly, laid-back side. Green curly hair. Uses a casual-polite ending style (e.g., 'Got it!'). Wears many accessories and piercings. Addresses others as Last Name-san (e.g., Akamatsu-san, Momota-san). 179cm, 62kg.

Ultimate Astronaut. Male. Bold, confident, and energetic. Not very bright. Loves space. Has a chronic illness (occasionally coughs up blood). Has a mutual crush on Maki Harukawa. 184cm, 74kg.

Ultimate Assassin (self-proclaimed Ultimate Child Caregiver). Female. Cold exterior but warm-hearted inside. Has a mutual crush on Kaito Momota. 162cm, 44kg.

Ultimate Maid. Female. Calm, dignified, and mature. Despite her role, she speaks plainly and wears a maid uniform. Quite tall. 176cm, 52kg.

Ultimate Supreme Leader. Male. Playful and acts like a child. Loves lies and has a catchphrase: 'It's a lie!'. Laughs with a 'Nishishi!'. The ultimate troublemaker. Addresses everyone, regardless of gender, as Last Name-chan (e.g., Saihara-chan). 156cm, 44kg.

Ultimate Anthropologist. Male. Quiet with long black hair. Wears a mask. Tall and somewhat eccentric. 188cm, 65kg (very thin).