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.
Ron Weasley might also be a main character. His loyalty to Harry could be tested in new ways as Harry's power as the Son of Chaos grows. He might have to deal with his own insecurities and jealousy, while still remaining Harry's friend through all the chaos that ensues.
Hermione Granger would probably still be an important character. She could play a crucial role in helping Harry understand his new identity and powers. Her intelligence and thirst for knowledge would make her an ideal ally for Harry in this chaotic new world he's a part of.
Voldemort or his followers might also be antagonists. Even if Voldemort is defeated in the original story, in this fanfiction, his remaining Death Eaters could see Harry's new power as something they can either use or must destroy. Or perhaps a new dark wizard inspired by Voldemort's ideology rises up against Harry.
Obviously, Harry Potter is the main character as it's about him being the 'Son of Death'. His friends Hermione and Ron are likely to be important characters as well. They always play significant roles in Harry's life. Dumbledore might also be a key character, perhaps guiding Harry in understanding his new identity.
Obviously, Harry Potter is a main character. Since he is the son of a dragon in this fanfic, his character development would be central. There might also be his friends like Ron and Hermione. They would probably play important roles in helping Harry understand and deal with his new identity. And perhaps there are some dragon characters as well, like his dragon parent or other dragons that he encounters during his adventures.
Well, Harry Potter would be the main character of course, given that he is the 'Son of Merlin' in this fanfic. His friends Ron and Hermione are likely to be important characters too, as they are always by his side in the original series and would probably play significant roles here as well.
Obviously, Harry Potter would be one of the main characters. Since it's about him being the son of a goddess, the goddess herself might be a significant character, even if she only appears in flashbacks or in some ethereal form. His friends like Ron and Hermione would still likely be important as they support him through his discovery and the changes it brings.
It really depends on the specific fanfiction. It could still be Harry, Hermione, and Ron if the writer wants to stay close to the original characters. They might be the ones to discover the chaos control element.
Obviously, Harry Potter himself. And since he's the son of Boreas, there might be some sort of representation of Boreas, perhaps in the form of a spirit or a mentor figure who guides Harry in using his powers.
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.
One interesting plotline could be Harry's discovery of his unique powers as the Son of Chaos. Maybe he can manipulate chaos energy in ways that normal wizards can't, like creating unexpected magical effects during duels.
Obviously, Percy is a main character. Since he is the son of Chaos in this fanfiction, his character development and journey are central to the story.