Brook

Brook is a skeleton who was found by the Straw Hats onboard a ghost ship after they opened a mysterious barrel adrift on the open ocean. He appears to be tall skinny skeleton dressed in formal attire complete with top hat and cane. Despite being completely skinless, his head is apparently covered with what appears to be an afro. After Luffy, Nami, and Sanji board his ship, and being hit by Nami, Luffy apparently asked him to join his crew.