There could also be an original character created specifically for this fanfiction who becomes the Dark Phoenix. This character would then be a central focus, with their transformation and the resulting events driving the story forward. Their backstory, motives, and relationships with other characters would be important aspects of the narrative.
Harry Potter himself is often a main character. Since he has a connection to the Phoenix through Dumbledore's Phoenix, Fawkes. He might be the one to face the threat of the Dark Phoenix. Hermione Granger could also be a main character. Her intelligence would be crucial in trying to understand and combat the Dark Phoenix. Ron Weasley might be there too, providing his loyalty and friendship. Another character could be Draco Malfoy, perhaps in a situation where he is either an ally or an adversary in the face of the Dark Phoenix.
Well, of course, Harry Potter himself is likely to be one of the main characters. He might have a special bond with the Royal Phoenix.
I don't know for sure as I haven't read it. It could feature characters like Harry Potter, Hermione Granger, or Ron Weasley as they are central to most Harry Potter fanfictions. Or it might introduce new characters related to the phoenix's birth.
Hermione and Ron are likely to be main characters too. They would be there to support Harry in his journey as the Son of the Phoenix. Maybe there are also some new characters, like an old wizard who knows a great deal about the phoenixes and their connection to Harry's family.
In this fanfiction, the main characters could be quite diverse. Since it's about a 'dark heir', there would likely be a character who embodies this role. It could be a previously unheard - of character with a complex backstory related to a dark legacy. Harry Potter might be involved to oppose this dark heir or to try and understand their motives. His friends, like Hermione and Ron, could also be part of the story. Additionally, there could be other magical beings or characters from the 'Harry Potter' lore, such as members of the Order of the Phoenix or Death Eaters, who are drawn into the plot due to the emergence of the dark heir.
Obviously, the Dark One is a main character. Harry Potter himself also often plays a crucial role as he is usually the one who has to face the Dark One in some way.
Well, Harry Potter is most likely one of the main characters as it's a Harry Potter fanfiction. He would probably be at the center of the new revelations and story developments.
It's possible that the main character is the 'dark child' of course. There could also be a mentor - like figure, maybe an older wizard who tries to guide the child towards the light. And it wouldn't be surprising if there were some antagonists as well, such as other dark wizards who want to use the child's power for their own evil purposes.
Luna Lovegood is often a popular character in fanfictions related to Harry Potter and the Phoenix. Her unique personality and perspective make her a great addition to new and different storylines. Writers can explore her friendship with Harry in more depth or even give her a more central role in the fight against Voldemort.
Harry Potter himself is often associated. Since he has a connection to the phoenix Fawkes in the original series, it's likely that in fanfiction involving a phoenix hybrid, he might play a role in discovering or befriending the hybrid. Hermione could also be involved as she is always curious about new magical phenomena and would surely be interested in a phoenix hybrid.