Well, it could go in many directions. Since he's chosen by Chaos, perhaps Percy will have to learn to control and manipulate chaotic energy. This could lead to him having abilities like creating portals to different chaotic dimensions. He may also find himself in a conflict between the order - loving gods and the forces of chaos, having to choose a side at some point.
In a fanfiction where Percy Jackson meets Chaos, Chaos might see Percy as a key figure in a much larger plan. Percy, being a demigod with a strong sense of justice and a history of saving the world, could be chosen by Chaos to bring balance to a part of the universe that's on the verge of chaos (in a more general sense). This could lead to Percy having to team up with strange and powerful allies, and facing enemies that he never even knew existed. It would be a wild ride for him, full of new challenges and self - discovery.
Well, in such a fanfiction, Percy might gain new and extremely powerful abilities as a son of Chaos. He could have control over primordial forces that are far beyond what he had as a son of Poseidon. For example, he might be able to manipulate the very fabric of reality in ways that would make him almost god - like.
He could have some primordial entities as allies. Maybe Erebus, as it is also related to the more chaotic and ancient aspects of the world. Another possible ally might be some minor chaos spirits that recognize his special status.
In this fanfiction, Percy could also have to make difficult decisions about the future of the chaos realm. Should he keep it separate from the mortal and godly worlds? Or should he try to merge it in some way? His choices would have far - reaching consequences for all the realms involved.
Well, he might gain incredible cosmic powers. He could have the ability to manipulate space, time, and matter at will. His appearance might change to something more otherworldly, with a glowing aura perhaps. And he could have a new level of wisdom, seeing the grand design of the universe.
If Percy Jackson joins Chaos in fanfiction, it would likely change his entire perspective. He's used to the world of Greek gods and demigods. But in the realm of Chaos, there are no such clear - cut rules. He could be sent on wild adventures across different dimensions. He might have to face enemies that are far more powerful and unpredictable than anything he's encountered before. And his relationships with his friends from Camp Half - Blood would also be put to the test as he becomes something more than just a demigod.
If Percy Jackson is leading the Chaos Army in fanfiction, one thing that could occur is that he forms alliances with other powerful forces. Given his reputation and the fact that he has friends in many different places, he could convince other groups to join his cause. He might also face challenges from within the army, as some members may not be used to his leadership style. However, Percy would likely overcome these challenges by proving himself through his actions and by showing that his way of leading is the best for the overall success of the Chaos Army.
Well, perhaps the plot could involve Percy being taken to a secret realm by Chaos. There, he'd be trained in new and powerful combat techniques that are beyond what he learned at Camp Half - Blood. He might also gain new powers related to chaos energy, which would make him an even more formidable demigod.
In fanfiction, if Percy Jackson was with a goddess, there could be all kinds of amazing adventures. They might go on quests together that are even more epic than the ones in the original books. For example, they could face a super - powerful ancient monster that no one has ever defeated before. And their relationship would bring a whole new dynamic to the story. Percy's mortal - turned - hero qualities would mix with the goddess's divine powers in really interesting ways.
He might be really surprised. Fanfiction can present him in all kinds of new situations that he never thought of. He could be amused by some of the creative interpretations of his character and his adventures.