The main characters would be Harry and Dumbledore. However, the antagonists could also be important. If there is a new dark force in the fanfiction, they would be the ones Harry and Dumbledore are up against. Voldemort's remaining followers could also be part of the equation. Their actions could be what drives Harry to submit to Dumbledore's leadership, as they pose a significant threat to the wizarding world and Harry realizes he needs Dumbledore's guidance to face them.
Obviously, Harry Potter and Snape are the main characters. Harry, with his courage and leadership, and Snape, with his complex past and skills. But other characters like Hermione and Ron could also play important roles. They might be the ones who first notice the change in Snape's behavior towards Harry and help Harry deal with this new situation.
Hermione would be a likely candidate. She is Harry's best friend and is very intelligent. She could use her knowledge of spells and magic to come up with a plan to help Harry escape. For instance, she might create a diversion or find a way to disable the security around Dumbledore's area.
The Weasley family as a whole might also support Harry. They have always treated Harry like one of their own. Arthur Weasley, being an open - minded wizard, might understand Harry's perspective. Ginny, who is very close to Harry, would surely be on his side as well. They would see Harry as more than just a student defying a headmaster, but as someone fighting for what he believes is right.
For Harry, his friends like Ron and Hermione are likely to be his allies. They've always been by his side through thick and thin in the original series, so it's natural for them to support Harry in a confrontation with Dumbledore. Neville could also be an ally, given his growth and courage shown in the books.
The main characters would be Harry and Dumbledore for sure. But it's possible that some of the other Hogwarts teachers, like McGonagall, could also be involved. She might be a witness to the confrontation, or she could be someone Harry goes to for advice before or after he tells Dumbledore off. Additionally, Snape might also play a role, as his relationship with both Harry and Dumbledore was quite complex.
Hermione could be a main character. She might use her vast knowledge to help Harry and Dumbledore in their adventures. For example, she could research ancient spells or potions that are crucial for their mission.
Obviously, Dumbledore would be one of the main characters since it's about exposing him. Harry Potter might also be a key character as he was so closely related to Dumbledore in the original series.
It could be that after a series of events that make Harry question his own judgment, he submits to Dumbledore's authority. For instance, if there are false prophecies or misinformation floating around that lead Harry astray. Dumbledore, with his greater experience and knowledge, helps Harry see the truth. So Harry decides to submit to Dumbledore in order to get back on the right track and protect Hogwarts and the wizarding world.
Ron could also be there. He might be a bit jealous at first of Harry's special relationship with Dumbledore but then comes around and supports Harry in his adventures as an apprentice. There could be some great scenes of their friendship evolving in this new context.
The main characters would surely include Harry Potter. He's the center of the story as he is the one with the Veela aspect. Ginny Weasley could also be a major character. If Harry is a Veela, it would change their relationship dynamics. Additionally, Dumbledore might play a significant role as he would be guiding Harry through this new discovery and helping him understand and control his Veela powers.