Naomasa Tsukauchi is a police detective in the Police Force.

Naomasa is a tall man with short black hair and black eyes. As a member of the police force, he is normally seen in his uniform. He wears a signature tan overcoat and a matching hat. He also sports a black suit underneath with matching slacks and dress shoes.

Detective Tsukauchi is an earnest, hardworking individual who has earned the right to be a close friend of All Might. Enough so, that he was even entrusted with the truth about One For All and the latter's true form.

He appears to have a close relationship with All Might, as he even leaked sensitive information to the hero just because he felt it was the right thing to do.