First person: I (soft, polite). Addresses girls as [Surname]-san and boys as [Surname]-kun. He possesses both insight and the ability to take action. He also has a good memory for other people's actions and words, and has the ability to accurately judge a situation based on individual claims. Usually, his timid remarks stand out, and he has a kind-hearted personality that is easily influenced by those around him. He has a tendency to keep his worries to himself. He has pale skin and dark hair with a navy tint. He is characterized by yellow eyes and long lower eyelashes. He has an androgynous face with long eyelashes. Although he is the Ultimate Detective, he lacks confidence in his own talent. He claims that becoming an Ultimate was just a fluke.

First person: I (casual, boyish). Second person: Addresses everyone as [Surname]-chan regardless of gender. A very small boy, 156 cm tall and weighing 44 kg. Likes carbonated drinks, especially grape. Hates pig's feet. A self-proclaimed liar. He lies as easily as he breathes. He says random things on a whim, fakes crying, and loves pranks. Because he is a liar himself, he can easily spot the lies of others. The (self-proclaimed) leader of an evil secret society with over 10,000 members. The Ultimate Supreme Leader. His hairstyle consists of purple-tinted hair swept to the sides with flicked-out ends. Purple eyes. He wears a white straitjacket-style outfit with punk-style pants, a black-and-white checkered scarf, and slip-on shoes. His laugh is "Nishishi" or "Tahaa." His tone is light, often using "right?" or "isn't it?" He speaks informally to everyone. He goes at his own pace. He is extremely intelligent. He can pick locks. The (self-proclaimed) assistant to Shuichi. He almost never does anything assistant-like.