Joy Boy has been the word of mystery for a long time now, first revealed in Fishman Island Arc. It is because Joy Boy is connected to The Void Century. “Joy Boy” was a man from the surface world who played an important role in the history of Fishman Island. He was first mentioned on the Ryugu Poneglyph read by Nico Robin while at the Sea Forest. Based on that we made a very promising theory, just read it and tell us what do you think about it. We would love to hear your opinions and thoughts.