Snape can be a prominent character. Given his complex relationship with Dumbledore and Harry, his perspective could add a lot to the story. He might have some insights into Dumbledore's actions that Harry doesn't know about, and his reactions to Harry's blaming could vary from being scornful to having a moment of understanding. Luna Lovegood could also be a part of it. Her unique view of the world might make her offer some different viewpoints on the situation between Harry and Dumbledore.
Neville Longbottom could be a significant character in this type of fanfiction. He has his own experiences with Voldemort and the fight against the Dark forces. He might empathize with Harry's feelings of being let down by Dumbledore, or he could try to remind Harry of the good Dumbledore did. Additionally, Ginny Weasley could be involved. As Harry's love interest, she would be concerned about Harry's state of mind when he blames Dumbledore and might try to help him work through his emotions.
Well, obviously Harry Potter. He's the main protagonist in the original series and in the bashing fanfictions, he might be the one to finally see through Dumbledore's facade. Ron Weasley could also be popular. He's Harry's best friend, and in these stories, he might support Harry in his doubts about Dumbledore. And then there's Voldemort. Some fanfictions might use Voldemort as a tool to show how Dumbledore's actions or inactions affected the battle against him. For example, if Dumbledore was so secretive, it could have made it easier for Voldemort to gain power.
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.
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.
In 'Harry Blames Dumbledore' fanfiction, a frequent theme is the idea of manipulation. Harry may come to believe that Dumbledore was manipulating him throughout his years at Hogwarts. This could include things like using Harry as a pawn in the fight against Voldemort without fully disclosing the risks. Another theme can be the exploration of Harry's emotional growth. His blaming of Dumbledore can be a catalyst for him to become more independent and less reliant on the guidance of others, forcing him to figure things out on his own.
Aberforth Dumbledore can be a very important character in these fanfictions. He is Albus Dumbledore's brother and has his own feelings and history related to his brother and Grindelwald. He might be the one who tries to bring his brother back from the brink when Dumbledore is too involved with Grindelwald. Also, Leta Lestrange could be popular. Her family's dark reputation and her own complex relationship with Newt and the wizarding world in general can add an extra layer of drama to the fanfictions involving Dumbledore and Grindelwald.
Harry and Dumbledore are no doubt at the top. But then, characters like Grindelwald also become important in this type of fanfiction. Since he had a complex relationship with Dumbledore, his inclusion can add a lot of drama. Also, Minerva McGonagall can be a popular character in these fanfictions. She was close to Dumbledore and had a role in Harry's life at Hogwarts. Her interactions with the exploration of Dumbledore's family affairs can be really interesting to read about.
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.
Dumbledore, as Harry's guardian in the fanfiction, would probably use his influence in the wizarding world. He could make sure that Harry is taught by the best teachers at Hogwarts. He'd also be there to offer advice and guidance, especially when Harry faces challenges like dealing with Voldemort or other dark forces. For example, he might teach Harry some advanced defensive magic privately to better protect himself.
Well, in some fanfictions, Harry might attack Dumbledore if he discovers that Dumbledore has been using him as a pawn in a bigger game all along. This feeling of betrayal could drive him to lash out. Also, if there is a prophecy that he misinterprets to mean Dumbledore is a threat to his future or the future of his friends, that could be a motive.
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.