In a fanfiction, Percy could face other demigods who are suspicious of him because of his relation to Kronos. He'd have to prove that he's not going to follow in Kronos' evil footsteps. Maybe he teams up with some unlikely allies, like a child of a minor god, to show his loyalty to the good side.
In some fanfictions, Percy Jackson is indeed portrayed as the true son of Chaos. Writers often take creative liberties to explore new storylines and character developments. This idea can lead to very interesting and unique plot twists, such as Percy having powers beyond what we see in the original series.
The plot could center around Percy's transformation into the 'Son of Chaos'. He might have to face challenges that test his loyalty to his old friends at Camp Half - Blood while also adapting to his new role. He may also encounter new characters who are either allies or enemies in this new phase of his life. It might also involve a power struggle within the chaotic realm where he has to prove himself worthy.
One possibility for a Percy Jackson fanfiction centered around the Primordial Son of Chaos could be a story where Percy discovers a hidden prophecy related to this powerful being. Maybe he has to team up with some unlikely allies, like a group of minor gods who are also interested in the balance that the Primordial Son of Chaos might disrupt or uphold. This could lead to a series of adventures across different realms, including Tartarus, where they search for clues about the true nature of the Primordial Son of Chaos.
The plot could involve Percy being ostracized by the other demigods due to his relation to Kronos. However, he discovers a prophecy that only he, as the son of Kronos, can fulfill. This prophecy might be about saving the world from a new threat that is related to the Titans in some way. He then has to go on a quest to gather ancient artifacts or gain the trust of certain beings to be able to carry out the prophecy.
In my opinion, it has its merits. It takes the familiar Percy Jackson world and turns it on its head. If you're a fan of the series and like to see alternate versions of the story, this fanfiction could be really interesting. It could delve deeper into the concept of Chaos and how that affects Percy's life. For example, his relationships with other characters might be completely different, and the way he views the world of gods and monsters could change too.
If Percy is the son of Chaos in fanfiction, it would change his relationship with the gods. They might view him with more suspicion or even fear. Also, his role in the world of demigods could be redefined. Instead of just being a hero for Camp Half - Blood, he could be seen as a more cosmic figure with a much larger purpose.
Percy Jackson is definitely a main character. He's the one at the center of the 'son of chaos' concept. Then there are his friends from Camp Half - Blood like Annabeth. She might be involved in trying to understand Percy's new situation or helping him in his new adventures. Grover could also be there, being Percy's loyal friend as always.
In some fanfictions, Percy being the son of Chaos and Poseidon is a really cool concept. It often gives him even more power. He might be able to control not just water like a son of Poseidon but also have some chaotic powers. For example, he could disrupt the order of things in a battle, or create portals to different realms which are abilities not typically associated with a normal demigod.
Another main character could be Chiron. He has always been an important figure in Percy's life. In this fanfiction, he might be the one who first discovers Percy's connection to Chaos and tries to guide him. Or he could be struggling to understand how to deal with Percy's new situation, especially if Percy's powers start to have unforeseen effects on Camp Half - Blood.