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 death and King thinking that Kaidou could have been such a figure, "Joy Boy" likely refers to a title or identity someone can attain. This was eventually confirmed when Zunesha proclaimed the "return of Joy Boy" after Monkey D. Luffy awakened his Devil Fruit.

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. Zunesha expresses happiness when Joy Boy has apparently returned.

Devil Fruit
Joy Boy ate the Hito Hito no Mi, Model: Nika, a Mythical Zoan-type Devil Fruit that allowed him to become the incarnation of the Sun God Nika, it gave his body the properties of rubber and allowed him to fight however he wished. He also had the power to bring smiles to others.

Upon Awakening, he gained an even greater degree of freedom and his rubber body became far stronger. He also gained the ability to bestow the properties of rubber onto his surroundings.

The fruit gives the user a unique heart beat, described as the "Drums of Liberation".

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 due to an unknown reason.

At some point, he became a comrade of Zunesha.

At a different 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 become known to the world as One Piece.

Legacy
Joy Boy left messages regarding his return 800 years later. One of those messages was to Fish-Man Island and to Poseidon, apologizing for breaking his promise, and promising that someone would fulfill it in the future. Another message was left at the unnamed island, claiming that he would return in 800 years' time.

When the Roger Pirates conquered the Grand Line by reaching the then unnamed island, they read the message and learned the true history of the world but decided to leave it as is, as they were too early.

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.

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

According to king Neptune, there is a legend in the royal family regarding the person who will fulfill Joy Boy's promise.

Amatsuki Toki would use her abilities to head to future Wano in search of the day of Joy Boy's return.

During the Roger Pirates' journey, after Kozuki Oden joined, they traveled to Fish-Man Island and on their way, both Roger and Oden heard the Sea Kings talk about the birth of someone who will lead them in 25 years along with the new Poseidon. After the crew's discovery on Laugh Tale, Oden returned to his home in Wano Country, which 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 foiled by the then shogun Kurozumi Orochi and pirate Kaidou, so he left the task to his Family.

At an unknown point in time, Kaidou learned about Joy Boy and has been searching for the next one for an unknown reason. King, a member of the Beasts Pirates 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.

After Monkey D. Luffy was defeated by Kaidou on the Skull Dome 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, awakening his Devil Fruit and transforming into his Gear 5 form for the first time.

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.
 * With Kaidou's comment about becoming Joy Boy, and Roger and Oden awaiting his return, it is possible "Joy Boy" is just a title given to the consumer of the fruit that, to go by the Five Elders' explanation of the Hito Hito no Mi, Model: Nika, "brings smiles to the faces of the people".

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