Zombieman

Race: Human
Occupation: Superhero
Level: S-Class; Rank: 8
Affiliation: The Heroes Association
Debut: Chapter 29

Zombieman has scruffy short black hair, red eyes, thin eyebrows, and a pale complexion. He wears a worn out, open coat over his black shirt.

It is later discovered that he was created by the House of Evolution as one of the immortal creations, but he managed to escape and become a hero.
(Source: One Punch-Man Wiki, edited)