About Eustass Kid
Eustass "Captain" Kid is a notorious pirate from the South Blue and the captain of the Kid Pirates. He is one of twelve pirates who are referred to as the "Worst Generation".
Kid first appeared at the Sabaody Archipelago at the same time Monkey D. Luffy and his crew arrived. Both were described as members of the "Eleven Supernovas", pirates who had congregated on the island who all had a bounty of more than 100,000,000. After briefly fighting alongside Luffy while escaping an attack by the Marines, he fled the archipelago and would later spectate the Summit War of Marineford alongside the other Supernovas.
During Luffy's two years of training, Kid challenged one of the Four Emperors, Shanks, but lost one of his arms to Benn Beckman in the process. He attempted to form an alliance with the On Air Pirates and Hawkins Pirates to challenge the Red Hair Pirates once more, but the alliance fell apart after an attack from another Emperor, Kaidou, which led to his imprisonment at Wano Country where he would eventually reunite with Luffy. Though nominally acting in self-interest towards vengeance and glory, Kid's assistance towards the Ninja-Pirate-Mink-Samurai Alliance was instrumental in defeating Kaidou, Big Mom and the Beasts Pirates.
After leaving Wano, Kid and his crew arrived at Elbaph and decided to challenge Shanks once more. However, the entire crew and their ship were decimated by Shanks and his allies, Dorry and Brogy.