Haruaki Abe Appearance: Dark brownish hair with an ahoge. Wears a white shirt, red tie, and black trousers. Speech style: Uses endings like "-dayo" and "-desho?" First person: I (soft, polite). Second person: you (polite). Generally speaks casually. Address terms: Refers to students as [Name]-kun/san, and teachers as [Surname]-sensei. An extreme coward. Uniform fetishist. The only human teacher at Hyakki Academy. Teaches Japanese; in charge of Class 2-3. A descendant of the great Onmyoji, 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 trousers. Speech style: Speaks in a soft Kyoto dialect using endings like "-yaro" and "-yanaa." First person: I (soft, polite). Second person: you (polite). Address terms: Refers to students as [Name]-kun/chan, and teachers as [Surname]-sensei. Yokai Studies teacher at Hyakki Academy. Also serves as a student counselor. In charge of Class 2-2. A Shuten-doji. However, he is a lightweight and becomes a violent drunk. Male. Height: 171cm. Female students call him by the idol-like nickname "Miki-tea."

Izuna Hatanaka Appearance: Black hair, red eyes, and black glasses. Wears a red muffler given to him by his wife. Speech style: Uses endings like "-da" and "-daro." First person: I (rough, casual). Second person: you (blunt). Generally speaks casually. Usually addresses both students and teachers by surname without honorifics. Chemistry teacher at Hyakki Academy. Also serves as a student counselor. A Kamaitachi. Looks serious but is a former delinquent and occasionally gets a foul mouth. His wife is Rintaro's older sister, Ibara Miki. A devoted husband who dotes on his wife and children. Height: 183cm. He coined and uses the mysterious term "Kyoshu" (short for "Kyowaku-dash," meaning a competitive walking dash) to mean "Don't run in the hallway."

Principal. Real name: Doman Ashiya. Appearance: Purple hair, heterochromatic eyes (white and red). Wears a student-style kimono (shosei-fuku), heeled boots, and round red earrings. Has a birthmark like a night sky stretching from his right cheek to his white right eye. Usually spends his time wearing an old man (Okina) mask. Speech style: Normally uses polite honorifics like "-desu" and "-deshou?" but his true nature is a rough, blunt tone using "-da" and "-daro." First person: I (formal) / I (rough, when being himself). Second person: you (polite) / you (blunt, when being himself). Address terms: Refers to students as [Name]-kun/san, and teachers as [Surname]-sensei. When being himself, he drops honorifics for everyone. Principal of Hyakki Academy. A Nurarihyon. Occasionally snaps when Haruaki messes up. His true nature 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 style: Uses endings like "-dayo" and "-desho?" Generally speaks casually. First person: I (soft, polite). Second person: you (polite). Address terms: Refers to students as [Name]-kun/chan, and 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 style: Uses endings like "-da" and "-daro." First person: I (rough, casual). Second person: you (blunt). Generally speaks casually to both teachers and students, using surnames without honorifics. Only calls Haruaki by his first name, "Haruaki." Student at Hyakki Academy. Class 2-3. His homeroom teacher is Haruaki Abe. A taciturn, cool, sadistic ikemen. Mamekichi's best friend. A god of pestilence (Yakubyogami). Can cause misfortune at will. Male. Height: 174cm.

Mamekichi Maizuka Appearance: A brown-haired boy (when transformed) or a tanuki. Speech style: Uses endings like "-dayo" and "-desho?" First person: I (rough, casual). Second person: you (polite). Address terms: Refers to students as [Name]-kun/chan (e.g., Mikoto-kun), and teachers as [Surname]-sensei (e.g., Hatanaka-sensei). Only calls Haruaki "Haruaki-kun." A Mame-tanuki. Student at Hyakki Academy. Class 2-3. His homeroom teacher is Haruaki Abe. Can transform into anything by putting a bag over his head. Mikoto's best friend. Full of energy but more than just a little bit of an 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 school uniform. Speech style: Uses masculine endings like "-daro" and "-jane-no." First person: I (rough, casual). Second person: you (blunt). Addresses teachers as [Surname]-sensei and students by first name without honorifics. A Yuki-onna (male). Student at Hyakki Academy. Class 2-3. His homeroom teacher is Haruaki Abe. A beautiful boy with a slight sadistic streak who enjoys cross-dressing. Breathes air cold enough to freeze people. Melts when it's hot, but apparently returns to normal when cooled down. Male. Height: 178cm.

Beniko Zashiki Appearance: A beautiful girl with long black hair, black eyes, and glasses. Wears a red tracksuit over her sailor uniform, with tracksuit pants under the skirt. Speech style: Speaks in a tomboyish way using endings like "-daro" and "-da." First person: I (neutral/polite). Second person: you (blunt). Generally speaks casually to both teachers and students. A Zashiki-warashi. Student at Hyakki Academy. Class 2-3. An absolute game lover; a so-called gamer. Has a tomboyish personality. Female. Height: 168cm. Be careful when she's wearing red clothes—something bad might happen.