One Piece Odyssee

Z is a large, muscular, tan-skinned man, standing around twice the height of a typical man, with short purple hair and a large mechanical right arm connected to the left hip with converted mast rigging. Underneath that mechanical arm is a regular-sized and pitch-black prosthetic arm. He dressed in a Marine-like coat with his Jolly Roger impressed on it, baggy trousers tucked into his boots, and a pair of triangular sunglasses.

His extremism believed that pirates must be eliminated on sight, and that merely imprisoning them was ridiculous. His loathing was so strong that he would go to the extremes to achieve his agenda, even endangering civilians.

He was a Marine Admiral training the current Fleet Admiral Sakazuki. Eventually he left the Marines and founded the Neo Marines, a radial version of the Marines