One Piece Odyssee

Diamante wears a light-colored hat with brown locks of hair coming down from it. He has striped, orange and red rectangular streaks that run down from his forehead, through his eyes, straight to his chin. Diamante dons a light-colored shirt with brighter red pants that match his cape. He is an extremely tall and thin man, noticeably larger than his 10-foot-tall captain, Doflamingo, and possesses a muscular upper body. He possesses a slight hunchback. His legs are especially long, protruding out right next to his face when he sits down. In the anime, he was given blue eyes.

Every time someone says something flattering or good about Diamante, he denies it until the person flattering him stops. That is when he accepts the compliment and believes that the person praising him had offered his or her unbiased opinion about his talents. He is also very cruel. Diamante also is rather insensitive and monstrous. Despite this, he has no tolerance for anyone who mocks his crew, whom he sees as family members. Diamante does not seem to give in to popular opinion. He also believes one must be honest with money. However, he is willing to use underhanded tricks to gain the upper hand when he feels necessary. Diamante has a distinct laugh: "Uhahahaha".

Diamante was very poor as a child, and grew attached to a pirate outfit that he found, wearing it to feel important as he dreamed of becoming a champion. He ate the Hira Hira no Mi at some point. Thirty-one years ago, on the island of Downs in the North Blue, a fourteen year old Diamante had befriended young Doflamingo along with a group of others which consisted of Trebol, Vergo, and Pica. Impressed with Doflamingo's Supreme King Haki, they pledged their loyalty to the former Celestial Dragon and treated him like royalty, protecting him from danger and training him in the deadly arts in order to make him the Pirate King.