Joy Boy is a man from the surface of the world who played a role in the history of Fish-Man Island. It is known, Joy Boy lived 800 to 900 years ago. He lives in a civil void when the world government erases this century from history. This results in very little information being known about the period in which Joy Boy lived. The figure of Joy Boy was first mentioned in Ryugu Poneglyph which was read by Nico Robin while in the Sea Forest. The artifact tells about about 800 years ago, the inhabitants of Fish-Man Island made a pact with Joy Boy.