About Akainu
Sakazuki, formerly known by his admiral alias Akainu, is the current Fleet Admiral of the Marines, succeeding the previous Fleet Admiral, Sengoku. During the first half of the series, he was one of the three admirals, and was the last one out of the three to debut. Upon becoming the Fleet Admiral, one of Sakazuki's first decisions was to relocate Marine Headquarters into the New World in preparation for the New Pirate Age. Sakazuki is one of the most strident followers of Absolute Justice in the Marines, to the point where his extremism prompted his fellow admiral Aokiji to oppose his promotion to Fleet Admiral and resign from the Marines after this effort failed.
In the manga, he was first mentioned by Nico Robin during the initial encounter with Aokiji. In the anime, he was mentioned earlier by Vice Admiral Jonathan during the anime-only G-8 Arc, which aired after he had been revealed in the manga. Due to his actions and role, including his involvement in the destruction of Ohara, murder of Portgas D. Ace during the Summit War and current status as the Fleet Admiral, Sakazuki is the main antagonist of the Marineford Arc and an overarching antagonist in the overall series, especially its second half.
Sakazuki is an incredibly tall, light-skinned, unusually muscular man (the most muscular of the former Admirals and on par with Sengoku and Garp). He's about as tall as his fellow Admirals, with a square-shaped face, very pronounced facial features, and short black hair. He stands at 306 cm (10'), making him taller than other massive characters like Jinbe, who is 301 cm. He usually wears a standard Marine cap and sports a crimson, double-breasted suit, decorated with what appears to be a pink rose on his left buttonhole. Unlike many high-ranking Marines, he does not wear a tie but instead leaves his light red-colored flower-patterned shirt unbuttoned, showing his muscular neck and part of his tattoo. He wears black gloves and black shoes.
The tattoo on the left side of his chest is black (light blue in the anime), containing numerous images of flowers integrated into its design. Sakazuki's tattoo has flame-shaped edges, and it extends from the Admiral's left shoulder to his hip, covering part of his back and ribs. He has another, smaller tattoo in the shape of a black sword on his right deltoids and a small part of the biceps. In the anime, his eye color is seen to be brown, and this was also shown in a colored drawing by Eiichiro Oda.