Akainu



Admiral Akainu, real name Sakazuki, is one the 3 Marine Admirals in the anime/manga One Piece and he's one of the most powerful fighters the Marines have to offer. He ate the Magma-Magma Fruit making him become living magma. He's cruel and heartless, and believes in the Marines motto of "Absolute Justice", which is to punish criminals at any cost. He will kill anyone that he thinks are evil or are an obstacle of justice. He will also kill his own comrades who run away from battle he will kill them no matter how they beg for mercy.

He's the one who killed Monkey D. Luffy's brother, Portgas D. Ace. His magma overpowered Ace's fire power, and punched him through the stomach as Ace was trying to protect Luffy. He even tried to kill Coby when he said further fighting would be pointless, but luckily, Shanks saved him just in time.