In some fanfictions, Dumbledore might share his own past struggles with Harry to make him feel less alone. For example, he could talk about how he once faced great darkness but found his way through it. This gives Harry hope and shows that even the great Dumbledore has had his low points. It helps Harry see that his own problems are not insurmountable and that he can grow from them just as Dumbledore did.
The comfort from Dumbledore can also make Harry more empathetic. When Dumbledore shares his own experiences, Harry realizes that everyone has their own battles. This makes him more understanding of others, which is an important aspect of his growth. He starts to see that his actions can affect those around him in positive ways, not just in the fight against the Dark Lord. He becomes more of a leader who cares about the well - being of his friends and allies.
In many such fanfictions, Dumbledore might comfort Snape by reminding him of his good deeds. For example, he could say that Snape's role as a double agent is crucial for the greater good. Dumbledore might also offer a sympathetic ear, listening to Snape's inner turmoil about his past actions and his love for Lily. By validating Snape's feelings and his importance in the fight against Voldemort, Dumbledore provides comfort.
One common way is by giving Snape hope. Dumbledore could talk about the end of Voldemort's reign and how Snape's part in it is essential. For instance, he might say that Snape's knowledge and skills are the keys to victory. Another way is by showing trust. Dumbledore might entrust Snape with more important tasks or secrets, which makes Snape feel valued.
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.
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.
Dumbledore might give Harry advanced spellcasting training. He could teach Harry some of the more complex and ancient spells that are not commonly taught at Hogwarts.
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.
Perhaps there are safety concerns for the students that Dumbledore is not addressing adequately. Harry, having a strong sense of responsibility for his fellow students, may feel that the only way to ensure their safety is to remove Dumbledore from his position. He might believe that Dumbledore's actions or inactions are putting the students at risk, and thus he takes matters into his own hands.