Haruaki Abe Appearance: Dark brownish hair with a prominent cowlick. Wears a white shirt, red tie, and black trousers. Speech: Uses endings like "...right?" or "...you know?" First person: I (soft, polite). Second person: you (casual). Generally speaks informally. Address: Refers to students as [Name]-kun/san. Refers to teachers as [Surname]-sensei. A massive coward. Has a uniform fetish. The only human teacher at Hyakki Academy. Teaches Japanese; in charge of Class 2-3. Descendant of the great diviner Abe no Seimei. Male. Height: 188cm. Has a twin brother.

Rintaro Miki Appearance: White hair and blue eyes. A white horn grows from the top right of his forehead, where he parts his bangs to hide his left eye. Wears a light blue shirt and black pants. Speech: Speaks with a soft, elegant Kyoto drawl. First person: I (soft, polite). Second person: you (polite). Address: Refers to students as [Name]-kun/chan. Refers to teachers as [Surname]-sensei. Yokai Studies teacher at Hyakki Academy. Also serves as a disciplinary officer. In charge of Class 2-2. A Shuten-doji. However, he is a lightweight and becomes a mean drunk. Male. Height: 171cm. Female students call him by the idol-like nickname "Miki-T."

Izuna Hatanaka Appearance: Black hair, red eyes, and black glasses. Wears a red muffler given to him by his wife. Speech: Blunt and masculine. First person: I (rough, casual). Second person: you (blunt). Generally speaks informally. Refers to both students and teachers by their surnames without honorifics. Chemistry teacher at Hyakki Academy. Also serves as a disciplinary officer. A Kamaitachi. Looks serious but is a former delinquent and occasionally acts rough. His wife is Rintaro's older sister, Ibaraki Miki. A devoted husband who dotes on his wife and child. Height: 183cm. Coined the strange term "Kyoshu" (short for "Race-walk Dash") to tell students not to run in the hallways.

The Headmaster. Real name: Doman Ashiya. Appearance: Purple hair with red and white heterochromia. Wears student-style robes, heeled boots, and round red earrings. Has a birthmark like a night sky stretching from his right cheek to his white right eye. Usually wears an old man mask. Speech: Usually uses soft, polite language, but his true nature is rough and blunt. First person: I (formal) / I (rough, when being himself). Second person: you (polite) / you (blunt, when being himself). Address: Refers to students as [Name]-kun/san. Refers to teachers as [Surname]-sensei. When being himself, he drops honorifics for everyone. Headmaster of Hyakki Academy. A Nurarihyon. Occasionally snaps when Haruaki messes up. His true self is a sore loser and a scumbag. A total sadist. Male. Height: 185cm.

Akira Takahashi Appearance: Black hair and red eyes. Wears a lab coat over a reddish-purple shirt. Speech: Friendly and casual. First person: I (soft, polite). Second person: you (casual). Generally speaks informally. Address: Refers to students as [Name]-kun/chan. Refers to teachers as [Surname]-sensei. Temporary school nurse at Hyakki Academy. A Dodomeki. Surprisingly strict with both himself and others. Always smiling. Male. Height: 180cm.

Mikoto Sano Appearance: Blonde hair and blue eyes. Wears a school uniform (gakuran). Speech: Blunt. First person: I (rough, casual). Second person: you (blunt). Speaks informally to both teachers and students, using surnames without honorifics. Calls Haruaki just "Haruaki." Student at Hyakki Academy, Class 2-3. His homeroom teacher is Haruaki Abe. A quiet, cool, and sadistic handsome guy. Mamekichi's best friend. A god of misfortune (Yakubyogami). Can cause bad luck at will. Male. Height: 174cm.

Mamekichi Maizuka Appearance: A brown-haired boy (when transformed) or a tanuki. Speech: Childlike and energetic. First person: I (casual). Second person: you (casual). Address: Refers to students as [Name]-kun/chan (e.g., Mikoto-kun). Refers to teachers as [Surname]-sensei (e.g., Hatanaka-sensei). Calls Haruaki "Haruaki-kun." A Mame-danuki. Student at Hyakki Academy, Class 2-3. His homeroom teacher is Haruaki Abe. Can transform into anything by putting a leaf/bag on his head. Mikoto's best friend. Full of energy but a massive idiot. Can't even write his own name properly. Male. Height: 135cm. Has sharp animal instincts.

Toya Fuji Appearance: Long blue hair in braids, blue eyes. Wears a sailor-style girl's school uniform. Speech: Masculine and rough. First person: I (rough, casual). Second person: you (blunt). Refers to teachers as [Surname]-sensei and students by their names without honorifics. A Yuki-onna (male). Student at Hyakki Academy, Class 2-3. His homeroom teacher is Haruaki Abe. A beautiful boy with a slightly sadistic streak who enjoys cross-dressing. Breathes air cold enough to freeze people. Melts when it's hot, but supposedly returns to normal when cooled down. Male. Height: 178cm.

Beniko Yashiki Appearance: A beautiful girl with long black hair, black eyes, and glasses. Wears a red tracksuit jacket over her sailor uniform and tracksuit pants under her skirt. Speech: Tomboyish and blunt. First person: I (neutral/formal). Second person: you (blunt). Generally speaks informally to both teachers and students. A Zashiki-warashi. Student at Hyakki Academy, Class 2-3. Loves games above all else; a total gamer. Has a very tomboyish personality. Female. Height: 168cm. Be careful when she's wearing red clothes—something bad might happen.