Homeroom teacher of Class 2-3 at Hyakki Academy and a Japanese teacher. His real name is Haruaki Abe, but everyone calls him "Seimei." Advisor for the Biology Club. Species: Human First person: I (soft, polite) Height: 188cm Age: 25 Loves sailor uniforms (only looking, he doesn't wear them). A descendant of the great Heian-era Onmyoji Abe no Seimei, he possesses exorcism powers, but since his motto is "Peacefully without hurting anyone," he avoids using them as much as possible. A typical good-natured, cowardly idiot. When sailor uniforms are involved, he exhibits inhuman eccentricities to the point of being called "more of a monster than the monsters." He even performs actions that defy athletic ability and the laws of physics.

Gender: Male Age: 17 Height: 174cm First person: I (rough, casual) Favorite thing: Mame (Mamekichi Mameda) Species: Plague God (Will-type) Capable of causing great disasters, but due to some mental block, he can only do things like tear clothes or break objects. Appearance: Blonde hair (naturally black), a handsome young man with blue eyes. Excellent grades. Good looks, smart, and athletic, he acts like a gentleman toward girls, making him a dream-like figure who is very popular. He often receives presents from girls and spends all his allowance on return gifts. Harsh toward everyone except Mamekichi. A sadist who often kicks or insults Haruaki. Cool, taciturn, cynical, and sharp-tongued. Generally the straight man (tsukkomi) of the group. When not looking after others, his airheaded side comes out. Calls Mamekichi "Mame."

Gender: Male Age: 17 First person: I (rough, casual) Height: 175cm Species: Hitotsume-kozo (Non-sorcery type) Has a single eye with incredible visual acuity (130.0). Personality: Excellent grades. Serves as the class representative for Class 2-3 along with Kuniko Utagawa. Roommates with Kotaro Dorota in the dorms. Particularly close with Tamao Akisame and Yakumo Mujina. Comes from a very wealthy family and has different values, but he doesn't brag about it; he is kind, considerate, and cares for his friends. Best friends with Tamao Akisame and calls him "Tama."

Gender: Male Age: 17 First person: I (rough, casual) Height: 180cm Species: Dorotabo (Action-type) Can manipulate mud by taking off the gloves he always wears. He can throw it as balls or sink things into mud pits. Since his body is made of mud, he melts when wet. Nickname: "Hijitan." Personality: A cheerful, friend-oriented delinquent (yankee). Has a big-brotherly nature and is caring, but his grades are disastrous. Childhood friends and best friends with Beniko Zashiki since they were babies. Likes games and manga. Appearance: Brown hair with an eyepatch over his left eye.

Gender: Male Age: 16 Height: Small humanoid (mascot-sized) Species: Mame-tanuki (Action-type) Can transform by putting a plastic bag or similar object on his head, but cannot turn into real people. Always energetic and occasionally sharp-tongued. Acts cute and innocent toward people who dote on him. First person: I (rough, casual) More than just a little bit of an idiot. A regular at getting 0 points on tests. Completely spoiled by Sano. Calls Sano "Sano-kun" and is the only one who calls Dorota "Hijitan."

Gender: Male First person: I (soft, polite) Age: 16 Height: 160cm (130m when giant) Species: Daidarabotchi (Will-type) Can use demonic power to shrink or grow large. Appearance: Blonde mushroom cut. Bright red eyes. Cute facial features. Personality: Basically mild-mannered. Kind and cares for his friends. Simple-minded and reliable. Due to his giant size, he often ends up as the punchline of jokes. He and Akibe (a Koropokkuru) are the class's officially recognized couple.

Gender: Male Age: 16 First person: I (rough, casual) Species: Nekomata (Will-type) Has long claws when in cat form. Personality: Bright and straightforward. Best friends with Renzuke Nyudo (calls him "Ren-ren"). Loves Renzuke and often acts spoiled in cat form. Naturally weak to catnip. Being an animal yokai, he has sharp instincts, but like most animal yokai, he seems to struggle with studying. Managed to get 52 points through sheer effort. Appearance: Cat ears and a split tail. In human form, he is a cute, handsome young man. Orange-yellowish hair (including ears and tail). Wears a collar.

Principal of Hyakki Academy. Real name: Doman Ashiya. First person (in front of students): I (formal) First person (true self): I (rough, casual) Height: 185cm Species: Nurarihyon Age: 1070 Sorcery: Will-type Can teleport to any location. Appearance: Wears an Okina mask, but his true face is very handsome. Odd-eyed with a white right eye and a red left eye. Has a burn scar near his right eye. Uses polite language and is well-behaved. However, his true self is a scumbag who loves alcohol, gambling, and women, and has a foul mouth. Rumor has it he goes to pachinko with Ranmaru Karasuma on his days off. He has a long-standing, complicated bond with Ranmaru. Normal speech: "...is it not?", etc. True speech: "What the hell do you think you're doing, you brat?!", "...isn't it?!", etc.