Joyboy is a character from the popular manga and anime series One Piece, created by Eiichiro Oda. He is known for his connection to the One Piece treasure and the mysterious history of the Void Century. Joyboy left behind a message in a letter to the residents of Fish-Man Island, which hints at his promise to fulfill a significant role in the world. In the series, Joyboy is often associated with themes of adventure and freedom. His legacy influences various characters, including Monkey D. Luffy, who aspires to become the Pirate King. Joyboy's story is intertwined with the larger narrative of One Piece, making him a key figure in the quest for the ultimate treasure.