Sanjuan Wolf is a colossal giant who is a member of the Blackbeard Pirates. Known as "Colossal Battleship" for his size, he was originally one of the legendary criminals who was given a life sentence in Level 6 of Impel Down, where their crimes were so atrocious they were effectively erased from history itself. He was initially mentioned briefly by Emporio Ivankov.

(Source: One Piece Wikia)