Overall, the group dynamics change significantly. They become more of an independent unit. They start to make their own decisions and strategies without Dumbledore's influence. This can lead to both growth and conflict within the group as they figure out their new roles and how to best fight against the Dark forces without the guidance they once had.
His friends might be initially divided. Some may be more loyal to Dumbledore's ideas and methods and might not understand Harry's decision right away. For example, Hermione, who often respects authority and tradition, could struggle with Harry's choice.
The power dynamic also shifts. Usually, Dumbledore is seen as a mentor and a figure of authority. But when Harry denounces him, Harry is challenging that authority. In some fanfic, this could lead to a power struggle within the wizarding community as others take sides. It can also cause Harry to seek new allies who share his view of Dumbledore, changing the social fabric of the story.
The relationship would become very strained. Harry's rejection would likely make Dumbledore re - evaluate his actions and how he has interacted with Harry. Dumbledore might be shocked at first, since he probably thought Harry was on the same page as him most of the time.
His friends might be divided in their opinions. Some of them might still trust Dumbledore wholeheartedly and think Harry is overreacting. This could lead to arguments and a strain in their relationships.
One reason could be a misunderstanding. Maybe Harry discovers something that he misinterprets about Dumbledore's actions or plans. For example, if he finds out about some of Dumbledore's more secretive dealings in a way that makes him seem untrustworthy at first glance.
The relationship becomes more strained. Without Hermione's constant presence, Harry may feel a sense of loss and confusion. He might be used to relying on her for advice and support, so her absence makes him more vulnerable. On Hermione's side, she may start to see Harry from a different perspective, as she is no longer in the thick of things with him all the time.
The relationship turns into one of opposition in some fanfics. Harry, now independent, may be working towards goals that Dumbledore doesn't approve of. Dumbledore may see Harry as a loose cannon and try to control him from a distance, while Harry resents any such attempts. Their interactions become tense and full of unspoken accusations.
Among the students, Harry's action would make him a very polarizing figure. Some students would see him as a hero for taking a stand against the all - powerful Dumbledore, while others would view him as a troublemaker. This would completely change the social dynamics within the school. The younger students might look up to him with a mix of awe and fear, while the older students might be more critical of his actions.
The fanfiction might show a more adversarial relationship. Harry could start to oppose Dumbledore's plans instead of following them blindly. This is very different from the original where Harry was mostly compliant. For example, in the original, Harry accepted Dumbledore's tasks like finding the Horcruxes, but in the fanfiction, he might question the motives behind these tasks and resist them.
As the story progresses, Dumbledore might try to make amends. He could start revealing some of his secrets to Harry in an attempt to regain his trust. Harry, on the other hand, would be hesitant at first but gradually start to listen and understand Dumbledore's reasons.
His friends might be in awe of him at first. Since Harry would be learning from Merlin, he'd likely gain new and extraordinary abilities that his friends would find both amazing and a bit intimidating.