Red King is a Marine Vice Admiral and one of the nine that took part in the Egghead Incident.
He is a large, bald man. He has a large mouth and a long neck with six chins and the word “MARINE” tattooed on the side. He wears a pinstripe suit with a dark shirt and light tie underneath and the Justice coat draped over his shoulders. He also wears a giant gauntlet on his right arm with the word “RED” written on it.

(Source: One Piece Wiki)