Well, for starters, Harry's confidence would be severely affected. He's already dealing with a lot, and having Hermione bully him would add another layer of stress. This could lead to him not trusting his friends as much. The overall plot would shift towards a more angsty and less magical - adventure - filled direction. For example, he might not be as eager to participate in things like the Triwizard Tournament or fight against Voldemort. The entire positive and hopeful atmosphere of the original series would be marred by this new, negative relationship.
It depends on how one views it. If it's just for the sake of exploring a different dynamic in a fictional, non - canon way, it could be seen as an interesting experiment. However, if it's portrayed in a way that is mean - spirited and completely out of character for Hermione, then it's not really acceptable. Fanfics should still uphold some basic values of the original work, and in the Potter world, their friendship is a key element.
In such fanfics, it can completely shift the focus of the story. The original story has a certain flow and character relationships. But when Hermione falls for Harry, it can lead to different alliances and rivalries. For instance, it might change how they deal with Voldemort. Maybe Hermione's love for Harry gives him an extra boost of confidence and they face challenges in a different way. It also changes the friendship dynamics as now Hermione's feelings are more than just platonic towards Harry, which can cause tension with Ron and also with other characters who are used to the original relationship structure.
It would likely cause a great deal of strain. Harry would probably feel betrayed and angry at Hermione. Their friendship, which was once strong, would be severely damaged.
Well, it changes the original relationships. Instead of Ron and Hermione, it's Harry and Hermione. This would mean that Ron's character would have to go through a different development arc. Maybe he becomes a bit more of a loner at first but then finds his own path outside of his friendship with Harry and Hermione.
Well, if Hermione and Blaise were siblings, Hermione might have had access to different knowledge and resources. Blaise comes from a different social circle in the wizarding world. This could have influenced Hermione's studies. Maybe she would have been exposed to some Slytherin - favored magic earlier. In terms of the overall plot, the conflict between the houses might have been less intense. Since Hermione has friends in Gryffindor and a brother in Slytherin, she could have played a greater role in promoting unity among the students. And Blaise himself might have changed. With Hermione as his sister, he might not be as cold towards the Gryffindors as he was in the original story.
It could be some Slytherin students who are jealous of Luna's unique personality and her friendship with Harry.
They would become more reliant on each other. Their relationship would shift from just being friends to co - parents. There would be a deeper level of intimacy and shared responsibility.
If Hermione was Harry's sister, the relationship between her and Harry would be more family - oriented. Ron might initially be a bit jealous as he has to share his two best friends in a different way. But overall, they could form a really strong trio with a new family - like bond.
If Hermione and Draco were siblings in fanfiction, it would completely turn the original story on its head. For one, Hermione's Gryffindor nature and Draco's Slytherin one would create a really interesting family dynamic. Their parents must have had a very complex relationship for this to be possible. It could lead to Hermione having a different view of the wizarding world from the start. Instead of being a Muggle - born advocate in the way she was, she might have had some internal conflict due to her Slytherin - influenced family ties. And Draco might not be as much of a bully as he was originally, or at least he would have a different kind of relationship with Harry, Ron, and Hermione.
The story could also change in terms of her academic progress. Her werewolf nature might make it difficult for her to attend classes during full moons. So, she might have to find alternative ways to study. This could lead to her exploring different areas of magic that are not part of the regular curriculum, thus changing the overall magical knowledge discovery in the story.