Seeker

A character from Yu-Gi-Oh! and also a character from One Punch Man. Maybe.

Season 0/OG
Appeared.

Season 0
A mysterious man with also mysterious motives.

Episode 6

Visits the police station where Kasuga Ichiban and Jack Garland are incarcerated, and informs something to Ooishi Kuraudo that makes him grin devilishly, likely something related to something Ooishi knows...