A O - Character in One Piece

Before becoming an ally, A.O once led his forces in an attempt to invade the territory of Whitebeard. However, he was later subdued and ultimately became extremely loyal, willing to risk his life to rescue Portgas D. Ace during the Marineford War.

A.O is one of the few allied captains who affectionately called Portgas D. Ace “Ace-chan.” This suggests that he fought not only out of duty but also out of a deep personal bond with Fire Fist Ace.

During the timeskip, A.O and his crew were attacked and completely annihilated by Edward Weevil, who claims to be the son of Whitebeard. A.O was left unconscious amid the blazing ruins, marking the tragic fate of a loyal ally.