Bellamy is the captain of the Bellamy Pirates, who ate the Spring-Spring Fruit. This gives him the ability to change his body into springs.
A cocky, arrogant hotshot pirate captain who seeks to unleash a new pirate age upon the world in which dreams are cast away and destroyed, Captain Bellamy and his Bellamy Pirates are stationed at the city of Mock Town on the island of Jaya when the Straw Hat Pirates arrive looking for answers regarding how to get to Sky Island. Bellamy duels with Monkey D. Luffy after beating up and looting Montblanc Cricket of his prized possessions, getting utterly crushed in battle. Battered and weakened to the point that it disappoints his superior Donquixote Doflamingo, Bellamy is considered a failure by the annoyed Doflamingo and by using his potent Devil's Fruit powers, takes over control of Sarquiss in order to finish off his failed underling. It is later revealed that Bellamy had in fact survived the wrath of Doflamingo back at Mock Town when he takes part in the huge tournament for the right to claim the Flame-Flame Fruit, which was the Devil's Fruit that Luffy's brother Portgas D. Ace had harnessed his powers from.
After losing to Monkey D. Luffy in their battle within Mock Town, a disappointed Donquixote Doflamingo appears at the scene of the battle where the shaken-up Bellamy and his stunned crew tries to recover from his crushing defeat. Expressing his displeasure with his failed underling, Doflamingo takes control over the body of the unwilling Sarquiss by using his Devil Fruit ability. Begging for another chance, the injured Bellamy pleads with his boss to allow him another shot to join the upcoming new pirate age alongside him, but is turned down by Doflamingo. Unable to stop what Doflamingo is doing with his body through his powers, Sarquiss finishes off the wounded Bellamy with his weapon.