Chinjao

Chinjao formerly known as Don Chinjao and Chinjao the Drill is a former pirate the leader of the Chinjao Family and the former 12th leader of the Happo Navy. He also joined as a gladiator at the Corrida Colosseum to compete for the Mera Mera no Mi. He has a bounty of over 500000000. Although at first he confronted Luffy for his hatred against Garp he became his ally during the Dressrosa Arc. Source: One Piece Wiki