Bartholomew Kuma is a former Warlord of the Sea, the former king of the Sorbet Kingdom, and a former officer of the Revolutionary Army with a bounty of 296,000,000.

Once feared as an extremely vicious pirate, earning himself the title “Tyrant”, he is now a human weapon called “Pacifista”, developed by Vegapunk. Once Vegapunk finished his modifications on Kuma, the Warlord was converted into the first complete Pacifista cyborg, with the serial PX-0, and mentally died in the process. Currently, he is a slave-to-rent for the World Nobles.

The Straw Hat Pirates had an unfortunate encounter with him during the Thriller Bark Arc and later during the Sabaody Archipelago Arc, where he was responsible for separating the crew. He is also a major antagonist in the Marineford Arc where he took part in the Summit War of Marineford and sided with the Marines, along with most of the other Warlords.