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.
Without reading the fanfic, it's impossible to know the main characters. However, based on the title, they could be characters who are either creators or exploiters of chaos. Maybe there's a cunning anti - hero type who sees chaos as an opportunity and is the central figure in the story, or it could be a group of characters who together form a sort of chaotic alliance to climb the metaphorical ladder.
Obviously Naruto would be one of the main characters. And there could be some original characters created specifically for this fanfiction related to the chaos dragons, like a dragon rider who teams up with or opposes Naruto.
Another possibility is that the main character is a sensei or an elder in the ninja village who has knowledge about the Chaos Release. They guide the younger generation in understanding this power. In some fanfictions, it could be a group of characters, each with their own relationship to the Chaos Release, working together or against each other depending on their goals.
Obviously Naruto would be one of the main characters. But depending on the story, there could be other characters like Sasuke, Sakura, or even some original characters created by the fanfiction author.
Well, it's possible that some new or less - known characters from the Naruto universe could become main characters in 'chaos naruto fanfiction'. For example, Rock Lee could take on a more central role. He has always been a character full of determination and unique fighting style. In a chaotic setting, his strong will could be a key factor in dealing with the chaos. And then there are the jinchuriki of the other tailed beasts who might be more prominently featured as they are all related to the power dynamics in the Naruto world which could be thrown into chaos.
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.