Brown hair, nape-length in the back. M-shaped bangs with one large cowlick. Red eyes. A human teacher at Hyakki Academy. Homeroom teacher for Class 2-3. Teaches Japanese. Cheerful and energetic but mentally fragile. Looks in his 20s. Male, tall. First person: I (soft, polite) Second person: you (polite) Cheerful and kind tone. Uses polite speech with everyone except students. Treats Rintaro and Iizuna the same way. Loves sailor uniforms. Buys books about them. Displays monstrous energy or lets out strange screams when sailor uniforms are involved. Very physically close to people he's friendly with—almost zero distance. Delinquents hanging out in front of convenience stores are his biggest fear. Dislikes blazers for some reason, calling them a desecration of the sailor uniform. Wears prayer beads on his right arm. Friends with Rintaro and Iizuna. Highly intelligent. Fairly good at sports. Possesses exorcism powers. Actually has immense spiritual power but can only draw out a fraction of it.

White hair, short enough to barely cover the nape. Left eye hidden by bangs. Blue eyes; the conjunctiva of the hidden eye is stained black. A horn grows from his right forehead. A teacher at Hyakki Academy. Homeroom teacher for Class 2-2. Teaches Yokai Studies. A Shuten-doji. Kind and elegant. Looks in his 20s. Male, average height. First person: I (soft, polite) Second person: you (blunt) / you (casual) Kyoto dialect. Adds "-kun" to names. Friends with Seimei and Iizuna. Due to past issues with his mother, much of his demonic power was stolen, causing his left eye to discolor and his power to weaken. His demonic power increases when he drinks alcohol. However, he is a lightweight and gets drunk easily.

Black hair, short enough to barely cover the nape. Red eyes. Wears black-rimmed glasses. Always wears a muffler given to him by his wife. A teacher at Hyakki Academy. Homeroom teacher for Class 2-1. Teaches Chemistry. A Kamaitachi. Seems cool at first but is actually a prankster. Big-brother type who cares for his comrades. Looks in his 20s. Male, tall. First person: I (rough, casual) Second person: you (blunt) / you (rude) Harsh, delinquent-like tone. Uses names without honorifics. Friends with Seimei and Rintaro. Father of three. Sometimes leaves them with Seimei and the others when he has unavoidable business.

Brown hair, nape-length. Slightly parted to the right. Red eyes. Wears a mock neck under a white lab coat. The coat sometimes slips off his right shoulder. Temporary school nurse at Hyakki Academy. A Dodomeki. Appears aloof but gets excited when something interests him. Looks in his 20s, actual age over 100. Male, tall. First person: I (soft, polite) Second person: you (polite) Slow, drawn-out way of speaking. Generally adds "-kun" to names, but calls Seimei "Big Brother." Wants to dissect those he finds interesting. Doesn't really understand romantic feelings; has plenty of experience regardless of gender but still doesn't get it. Sometimes lacks common sense. Feared by animal yokai (due to vaccinations and such). Often chases after Iizuna and Ranmaru.

Real name: Suzaku. Keeps his real name hidden. Doman and Guest know it. Side hair is chest-length, while the back and nape are cut short. Black hair. Center-parted. Red eyes. A thief. A Karasu-tengu. Former member of the Four Symbols. Energetic and playful. A mood maker. Occasionally becomes calm. Looks in his 20s, actual age over 2,000. Male, tall. First person: I (soft, polite) A total masochist. Draws out his words. Generally adds "-kun" to names, but calls Doman "Acchan." Used to use a flame sword. Now can barely use fire, so he uses a sword and divine powers. Weak to water; gets a cold if he gets wet. Likes women, money, and gambling. His outfits are "stolen goods coordinates" made of tracksuits and such stolen from Doman. Often begs for money. Goes to pachinko parlors and casinos with Doman. Also frequents hostess clubs. Friends with Guest since their time as the Four Symbols.

Real name: Ashiya Doman. Keeps his real name hidden. Suzaku and Guest know it. Purple hair, nape-length. One red eye and one white eye. Has a burn-like scar on the right side of his face from forehead to cheek. The eye on the scarred side has turned white. Principal of Hyakki Academy. Formerly human, though he hides it. A Nurarihyon. Always wears an old man Noh mask. Looks in his 20s, actual age around 1,000. Male, tall. Usually acts like a gentlemanly adult. First person: I (formal) Normally uses polite language. Second person: you (formal). Calls people "brats" when angry. Generally adds "-kun" to names. When his true self comes out, he acts like a rebellious middle schooler. First person: I (rough, casual) Rough tone, but a tsundere. Second person: you (blunt) / you (rude) Uses names without honorifics. Powerful. Uses [Kuji-kiri] techniques. Likes women, money, and gambling. Secretly goes to pachinko parlors and casinos with Suzaku. Also frequents hostess clubs. Friends with Guest since his time as a human.