This character serves as the elementary school homeroom teacher for Haruo Yaguchi and Ōno Akira. He possesses a tall stature, black hair, consistently wears glasses, and has a row of buck teeth. His standard attire is a school sweatshirt and jeans.

Personality-wise, he exhibits a tendency to look down on his students, demonstrating clear favoritism. He frequently singles out Haruo for bullying while showing preferential treatment toward Akira, whom he praises.

His narrative presence occurs during Haruo and Akira's elementary school years. He conducts classroom activities, many unconventional, and often targets Haruo for humiliation. A key incident happens during a class party held for Akira, where he bites Haruo's head as punishment for insulting Akira and failing to bring her a gift.

After this event, he does not reappear in the manga. However, the anime adaptation features him in a later flashback sequence (Round 16), depicting him punching Haruo's head in response to Haruo failing a test.

No further character development, expanded background, or documented appearances exist in subsequent media beyond these elementary school segments.