Naruto would likely still be one of the main characters. Since it's a Naruto - related fanfic, he's bound to play a central role, probably with his new chaos - influenced abilities or situation.
Sasuke could also be a main character. His relationship with Naruto might be further complicated by the chaos elements in the fanfic. Maybe they have to team up in a different way to deal with the chaos that is affecting the shinobi world.
The main characters in a 'naruto heir of chaos fanfic' might be the heir of chaos, of course. They could be a young ninja with a troubled past, perhaps an orphan who discovers their unique heritage. Naruto would likely be involved too. Maybe there are also some other well - known Naruto characters like Sasuke or Sakura. Sasuke could be suspicious of the heir of chaos and see them as a threat to his own goals, while Sakura might try to understand the heir's motives and help them fit into the ninja world if she believes they are not truly malicious.
There could be Sasuke. Since Naruto's situation changes, Sasuke might play a different role in this fanfic, either as an ally or a rival in a new way. Another might be Kakashi. He could be the one guiding Naruto through his discovery of being the son of chaos.
Another memorable character could be a new character created specifically for the fanfic. Maybe a mysterious ninja who has a complex backstory and strange powers. Their interactions with Naruto and the other established characters would make them stand out.
It's hard to say for sure without reading it, but it could be Naruto and his friends. They are the main characters in the original series, so it's likely they'll play important roles in this fanfiction as well, perhaps trying to combat the chaos.
Often, Naruto himself is likely to be one of the main characters. He might be drawn to the power of the Blades of Chaos and try to use them for the good of the village.
Obviously Naruto would be one of the main characters. There might also be his usual friends like Sasuke and Sakura. But since it's a fanfiction about him being the heir of chaos, there could be new characters introduced who are related to this chaos aspect, like some ancient beings or a secret clan.
Obviously Naruto would be one of the main characters. He's the protagonist of the original Naruto series and would likely be at the center of any fanfiction involving the Chaos King. The Chaos King himself is another main character, as the title implies. And Sakura might also be a main character as she is often part of Naruto's group and could play an important role in dealing with the chaos caused by the Chaos King.
Obviously, Percy Jackson is one of the main characters. He is usually at the center of the action. Another common character is Annabeth Chase. Her relationship with Percy often plays a role in the fanfic. Chaos itself can also be considered a main character in a sense, as it is the driving force behind many of the events.
Obviously, Harry Potter is the main character as he is the Son of Chaos in this fanfic. His character would likely be different from the original series, having more unpredictable and chaotic traits.
Since it's a Percy - centered fanfic, Percy is surely one of the main characters. There may also be other characters from the Percy Jackson series like Annabeth, Grover, etc. who could be involved in the story to react to Percy's new identity as a child of Chaos.