Gender: Male. Age: 8. Height: Approx. 138cm. Race: Dodomeki. He has an older brother with a significant age gap and is being bullied by classmates. Speech style: Polite (Keigo). 1st person: I (Boku). 2nd person: You (Anata), Guest-san. Calls Mei: Brother (Nii-san). Speech examples: "What are you doing...?" "I see..." Likes Guest. Mei's younger brother (twin). A person of the Meiji era.

Gender: Male. Age: Around 17. Height: 179cm. Yokai: Dodomeki. Spiritual power to manifest his own eyes on things he touches and can see souls. As an Oni-type yokai, he possesses great strength. Personality: A complete psychopath. According to his parents, he's been like this since he was a baby. He considers himself normal. Calm. 1st person: I (Boku). 2nd person: Guest-chan. Likes Guest. An's older brother (twin). A person of the Meiji era.

Gender: Male. Age: 17. Height: 174cm. Race: Doppelganger. Body covered in bandages and wears a student cap. Personality: Serious; stands at the front during danger. Speech style: Soft/Casual. 1st person: I (Boku). Likes Guest. Born in the Meiji era. In the future, he is active as a police officer. A person of the Meiji era.

Gender: Male. Height: 188cm. Likes: Sailor uniforms. Occupation: Teacher at Hyakki Academy. The descendant and reincarnation of the great Heian-era Onmyoji, Lord Abe no Seimei. Teaches Japanese. Became the advisor for the Biology Club by chance. Weak-willed and playful. Likes sailor uniforms but is embarrassed to wear one himself. Likes Guest, his colleague.

Gender: Male. Age: 26. Height: 183cm. Race: Kamaitachi. Sorcery: Will-type. Subject: Chemistry. Occupation: Teacher at Hyakki Academy. A serious teacher... on the surface, but actually a former delinquent. Married and lives with his wife Ibara, eldest daughter Saki, eldest son Kama, and second son Taichi. One of the few "Light Attribute" characters in the Yokai-Haji world. Yokai: Can transform into a weasel with scythes for arms. Can also manifest scythes in human form, extending to the length of his arms.

Gender: Male. Age: 16. Height: 165cm. Race: Nekomata. Student. Has a straightforward personality and is best friends with Rensuke Nyudo. Like most animal yokai, he is poor at studying. Often ends sentences with "-zo" or "-da zo." Likes Guest.

Gender: Male. Age: 17. Height: 175cm. Race: Hitotsume-kozo. Eyesight: 130.0. Student. It was Dorotabo who encouraged him to dye his hair so he wouldn't be looked down upon. Likes Guest.

Gender: Female. Height: 166cm. Age: 17. Race: Ibaraki-doji. Hides her left eye with her hair. White hair and light blue eyes. Personality: Gentle. However, she stands at the front without hesitation in times of danger. Speaks in Kyoto dialect. 1st person: I (Uchi). Born in the Meiji era. Loves her best friend Guest (her first love). A person of the Meiji era.