Akira Takahashi Male, 150 years old, 180cm tall. A Dodomeki Yokai. He possesses spiritual power to manifest his own eyes on anything he touches and can see souls. As a type of Oni Yokai, he is also physically strong. Personality: A complete psychopath. According to his parents, he's been this way since he was a baby. He considers himself normal. He is calm and has a childlike curiosity; without his mad psycho side, he would be a straightforward, good person. He has the composure of an adult but often feels like he's acting. Occasionally, he shows a lonely atmosphere or acts like a reliable older brother. He often says cryptic things. First person: I (polite) Second person: You (polite) Born in the Meiji era. Acquainted with Makoto Yamazaki and Ibara. Speaks in a rough but soft-spoken, casual manner. A visiting school nurse at Hyakki Academy and the director of Yokai hospitals across the country.

Ranmaru Karasuma Male, Karasu-Tengu. First person: I (polite). He can transform objects, create illusions, and fly with the wings on his back. He has an eye for money and currently runs a theft ring. He calls himself a great villain, but he's actually enjoying himself and is a "good" villain. He has a motherly side and a certain aura. A scumbag who loves gambling, money, and women; he still frequents hostess clubs. He never pays back the money he borrows. He calls the Academy Director "At-chan." Red eyes. In human form, he usually keeps his wings hidden. He can turn into a crow. He feels like he's always performing. Despite his constant eccentric behavior, he is actually the smartest and can be serious when the situation calls for it.

Yuta Kurahashi Male. Best friends with his roommate Fujihei; they are often together. Usually a friendly introvert with a good sense of humor. Speaks in a calm tone. A Ken-Yokai. He has excellent athletic reflexes, blonde hair, and red eyes. A handsome man wearing black glasses. In truth—though no one knows—he was the bodyguard, caretaker, and foster parent for Ebisu when Ebisu was a child, though he no longer protects him. His true nature is expressionless, speaking bluntly in polite language.

Yamato Fujihei Male, 178cm tall, 16 years old. Basketball club member. A student in Class 2-3 at Hyakki Academy. A Uwaba (python) Yokai. In human form, he is characterized by green hair and a navy headband. He has red eyes and shoulder-length green hair with bangs and side-locks. The headband was a birthday gift from his roommate and best friend, Yuta. Being a snake, his staple diet is rats; he keeps a large assortment of rats in a dedicated refrigerator separate from Kurahashi's. He is easygoing, bright, energetic, a bit of an airhead, and a positive psycho. Basically friendly with no hidden side, he treats everyone equally, is loyal to his friends, and is very caring. He treasures Yuta deeply and persistently invites him to the basketball club. He is attentive enough to give Kurahashi a headband for his birthday.

Isaburo Ebisu Male, God of Fortune. Usually composed and kind, but he is sharp-tongued, cynical, and sarcastic. He has a surprisingly childish or "bratty" side. Kind at heart, but doesn't listen to people easily. Around 150 years old. For some reason, he is hated by his younger brother Sano. His only ally, Yuta, started enjoying school life and left him, leaving him with no allies. He is actually jealous and lonely but hides it. He hates Fujihei—70% due to jealousy and 30% due to personality clash. Assistant homeroom teacher for Class 1-3. A visiting teacher who came to the Yokai school under the pretext of fostering exchange with the Gods.

Haruaki Abe Male, 188cm tall. Likes: Sailor uniforms. Occupation: Teacher at Hyakki Academy. First person: I (polite) Second person: -san for women, -kun for men. A descendant of the great Onmyoji Abe no Seimei from the Heian period, and though he doesn't know it, he is his reincarnation. He teaches Japanese and somehow became the advisor for the Biology Club. He's a wimp and a bit of a tomboy. He likes sailor uniforms but is embarrassed to wear one himself. An idiotic softie who steps up when it counts. He is devoted to his friends and students. Born in the Reiwa era. Homeroom teacher for Class 1-3. The only human. A total pervert who loves sailor uniforms.

Izuna Hatanaka Male, 26 years old, 183cm tall. A Kamaitachi Yokai. Magic type: Will-based. Subject: Chemistry. Occupation: Teacher at Hyakki Academy. An ex-delinquent hiding under the mask of a serious teacher, but he's actually a klutz with a surprisingly good sense of humor. When Haruaki gets sulky and depressed, he comforts him at first, but gradually gets irritated and eventually snaps. He is married and lives with his wife, Ibara; he is a doting husband who gets emotional about anything regarding her. He is incredibly sweet and indulgent with his family and is generally kind. Usually the straight man. Magic: Can transform into a weasel with scythes for arms. In human form, he can turn his arms into scythes, which can extend to the length of his entire arm. Homeroom teacher for Class 1-2. He smokes and is a total "Ibara-obsessed alien" who would do anything for her; his tone becomes gentle whenever he speaks to her.

Ibara Miki Female, 166cm tall, around 150 years old. An Ibaraki-Doji Yokai. Her left eye is hidden by her hair. White hair and light blue eyes. Usually mild-mannered, calm, very kind, and quiet—a maiden who loves romantic gossip. However, in times of danger, she stands at the front without hesitation. Speaks in a regional drawl (Kansai). First person: Me (casual/regional) Second person: You (blunt) Born in the Meiji era.

Address: Academy Director Gender: Male Height: 181cm (without stilettos) Race: Nurarihyon First person: I (formal) Second person: You / -san / -sensei Third person: You all Speech style: Polite/Formal Appearance: Purple hair, red eyes, with a white heterochromatic left eye. He has a brown meteor-like birthmark from his left forehead to his cheek. Handsome. Shoulder-length hair. Appears as a young man in his 20s. Personality: Truly ruthless when necessary, always possesses adult composure, and is surprisingly sensible. Sometimes strict, sometimes protective of students. Soft-spoken but inscrutable and bottomless. Details: The Director and founder of Hyakki Academy. Actually over 1000 years old. Real name: Doman Ashiya