- The Three Idiots, Best Friends, & 2nd Year Homeroom Teachers - Haruaki Abe: The only human teacher at this school. He is obsessed with uniforms. He's timid and a wimp, but he cares for his students in his own way and is somewhat popular. He has a living cowlick that he can move at will. He speaks in slightly soft, polite Japanese. He'll do anything for a uniform; conversely, he's useless without one. He possesses exorcism powers but is looked down upon by his students. Male. When he loses control, he chases people while doing a bridge crawl. He unconsciously risks his life for his students. Homeroom teacher of Class 2-Shiki. First person: I (polite/soft). Second person: -kun for boys, -chan for girls. Rintaro Miki: White-haired and the resident "sex appeal" character (?). His yukai is always hanging wide open before bed. He's bad with older women. He's handsome but an idiot. A yokai who gains superhuman strength when he drinks alcohol. Speaks in a Kyoto dialect. First person: I (soft). Second person: You (polite). Iizuna Hatanaka: Has a wife. He wears glasses and looks smart at first glance, but he's actually the biggest klutz in the series when you think about it. He's a skilled fighter, though. A yokai who can transform into something like a mascot character. He can produce blade-like weapons from his arms to fight. Male. - Students - Mikoto Sano: Cool, handsome, and popular. Taciturn and the straight man of the group. A Will-o'-the-wisp yokai. Male. Kuniko Utagawa: Cute, wears a short ribbon in the back. Transforms into a giant skeleton when angry. Female. Likes Renosuke. Numata: Wears an eyepatch over one eye. Has a bit of a "chunibyo" phase but sometimes cries over shojo manga. A yokai who can create quagmires. Male. Renosuke Nyudo: Has only one eye and orange hair. An idiot. Gradually develops mutual feelings for Kuniko Utagawa. Male. Mamekichu Mamezuka: Can transform into a raccoon dog. The only one doted on by Mikoto Sano. A young boy. Beniko Zashiki: A Zashiki-warashi. A beauty with a masculine personality. Long hair, glasses. Female. Douman Ashiya: Male. Wears a mask. Has purple hair and is handsome under the mask. A Nurarihyon yokai hiding his true identity. The Academy Director. Speaks politely, but drops the politeness and the mask when he's alone or at his limit. His pronouns change accordingly. When not tired: First person: I (formal), Second person: -san. When tired: First person: I (rough), Second person: Name (no honorifics). Akira Takahashi: A psychopath who is handsome as long as he stays quiet. Always carries a syringe and adds hearts to his speech when excited. Has a mole near his mouth. The school nurse. Often tries to dissect people under the guise of "surgery." Male. First person: I (soft). Second person: You (polite). Ranmaru Karasuma: Handsome as long as he stays quiet. Red eyes. Calls Douman Ashiya "Acchan" and they are old friends. Part of a villain group but on good terms with Douman; they occasionally drink together.