Krait

Introduction
Krait is the boss of the Bluefin Mafia, located in West Port. However, after his defeat, he was arrested by the Marines and sentenced to life imprisonment in the fourth level of Impel Down, making him one of the first criminals in Crypt City to actually be arrested and given a sentence. Due to his actions, he can be considered as a major antagonist in the West Port Arc of One Piece: Metal Heart.