Sakazuki, better known by his alias Akainu, is a major antagonist in One Piece and one of the highest-ranking officers in the Marine organization. He is the Fleet Admiral of the Marines and is known for his uncompromising sense of absolute justice, extreme ruthlessness, and overwhelming power through the Magu Magu no Mi, a magma-based Devil Fruit. He plays a central role in major conflicts such as the Paramount War and represents the harsh, authoritarian side of Marine justice.