Magellan

Magellan (マゼラン, Mazeran) is the chief warden of the World Government's underwater prison, Impel Down. While he was the warden, it was thought that Portgas D. Ace was being held in the prison. Monkey D. Luffy first encountered Magellan during his quest to rescue Ace before reuniting with his crew. When it seemed that Luffy has the advantage, he unexpectedly touched Magellan's poison and was imprisoned. Later, the entirety of the prison staged a massive breakout. Luffy fought the warden in a rematch at the prison's entrance, this time with the aid of Galdino's strong wax. In the end, Magellan was defeated. However, the warden tried one last time to stop the escapes, only meeting resistance form one of Luffy's enemies turned friends, Bentham. For his failures two years later, Magellan was demoted to Vice Warden.

Fighting Style
Magellan ate the Doku Doku no Mi, giving him immunity to poison and allowing him to manipulate poison. He can also summon a hydra made of poison to spit balls of poison on his foes.