Eustass “Captain” Kid is a notorious pirate from South Blue and the captain of the Kid Pirates. He is one of twelve pirates who are referred to as the “Worst Generation”.

One of the reasons his bounty was higher than Luffy’s when they arrived at the Sabaody Archipelago was the huge numbers of civilian casualties that Kid and his crew caused in the course of their activities. Sometime during the timeskip, his bounty was raised from 315,000,000 to 470,000,000. He also lost one of his arms in a confrontation against one of the Four Emperors, Shanks, during this period, and attempted to form an alliance with the On Air Pirates and Hawkins Pirates to challenge the Red Hair Pirates once more, but it was eventually disbanded due to an encounter with another Emperor, Kaidou.

Kid and his crew briefly join forces with the Straw Hat Pirates and Heart Pirates during the Sabaody Archipelago Arc. He also becomes an ally member of the Ninja-Pirate-Mink-Samurai Alliance during the Wano Country Arc.