Joy Boy

Joy Boy was an extremely relevant figure of the Void Century who played an important role in the history of Fish-Man Island and left behind a certain item of unimaginable value on the last island of the Grand Line. He was first mentioned on the Ryugu Poneglyph read by Nico Robin while at the Sea Forest. Gol D. Roger declared that he wished the two could have lived during the same period upon learning the true history on Laugh Tale.

Due to Kozuki Oden expecting Joy Boy to reappear 900 years after his last known appearance and King thinking that Kaidou could have been such a figure, "Joy Boy" likely refers to a title or identity someone can attain.

Personality
Nothing is known about his personality, but according to his apology message in the Poneglyph, he had great regrets for not keeping his promise to Fish-Man Island.

Zunesha
According to Momonosuke, Joy Boy was a comrade of Zunesha back during the Void Century. Outside of that, the specifics of their relationship are still a mystery.

Biography


Around 900 years ago, the residents of Fish-Man Island made a promise to a great man known as Joy Boy. He attempted to raise Noah with Poseidon's aid, but he broke his promise to Fish-Man Island. However, Fish-Man Island promised that they would keep Noah safe until a certain day came. Joy Boy left a letter in the form of poneglyph to Poseidon, apologizing for breaking his end of the bargain.

At some point, he became a comrade of Zunesha.

Also at some point, Joy Boy came across an island, which would later be named Laugh Tale by Gol D. Roger, and left behind a treasure that would come to be known by the world as One Piece.

Legacy
When Roger conquered the Grand Line by reaching the then unnamed island, he learned the true history of the world but decided to leave it as is, believing he and his crew were too early. Kozuki Oden, a member of the crew, returned to his home in Wano Country, that also had a connection to Joy Boy, and made plans to open up the enclosed land in preparations to Joy Boy's return, however his efforts were fortified by the then shogun Kurozumi Orochi and pirate Kaidou, so he left the task to his son and retainers.

You couldn't be Joy Boy... either, it seems...

At an unknown point in time, Kaidou learned about Joy Boy and has been searching for the next one for an unknown reason. King, his subordinate and a lunarian, seemingly believed that Kaidou could have become Joy Boy and change the world, although he eventually came to dismiss the figure as a mere legend. Sometime after Oden's death, Yamato, Kaidou's child and an admirer of Oden, took up Oden's name and after learning the truth from Oden's journal, worked to fulfill his dream.

Fish-Man Island's half of the promise was almost broken during the events of the Fish-Man Island Arc, when Monkey D. Luffy was asked to protect the island no matter what the cost, even if it meant that Noah had to be destroyed in the process. Before Luffy could destroy the ship completely, Noah's fall was stopped by a group of Sea Kings that were summoned unknowingly by Shirahoshi, thus saving Fish-Man Island and maintaining the nation's promise to Joy Boy. However, the ship was still heavily damaged. The Sea Kings then took the ship to the Sea Forest, where they planned to fix it.

Wano Country Arc
After Monkey D. Luffy was defeated by Kaidou on the Onigashima rooftop, Zunesha proclaimed that it can hear the "Drums of Liberation" (解放のドラム) and that Joy Boy has returned. Luffy then began to regain his consciousness and grinned while seemingly undergoing a transformation.

Trivia

 * Joy Boy made a promise with the residents of Fish-Man Island 900 years ago, but since the Poneglyphs were invented by the Kozuki Family 800 years ago, his letter of apology was inscribed at least a century later.
 * Going by Oden's logbook, Joy Boy and his second coming were indirectly mention by Whitebeard in Chapter 576, as "the man Roger is waiting for".

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