A O

A.O is an infamous New World pirate who allied himself with Whitebeard.

Appearance
A.O is a very tall man with a long square shaped face, hollow eyes under prominent eyebrows, dark sideburns that go all the way down to his chin, and greenish long wavy hair. On his head he wears a striped bandanna with a standard tricone captain's hat with what appears to be his Jolly Roger on it, a skull wearing an animal-like hood. He also wears a dark blue, open shirt with the sleeves rolled up and a ruffled collar, and elaborate earrings made up by three little jewels each on both ears.

Abilities and Powers
A.O is a fearsome pirate who has managed to make himself an infamous reputation in the New World, and to ally himself with Whitebeard. He was seen charging forward with his fellow allies wielding an unseen weapon above his head with both hands.

History
In the past, he allied himself with Whitebeard. A.O and his crew are first seen, along with a fleet of 42 other infamous pirate crews, allied with the Whitebeard Pirates, attacking Marineford to save Portgas D. Ace from his execution and participated in the Marineford Arc to try and save Ace.

Trivia

 * His name is given in the anime's credits, not in the manga, and therefore cannot be considered be canon.