Luna could be in this fanfiction. She would probably have a very unique perspective on Harry's actions. She might see it as a sign of Harry breaking free from the norms that have been confining him. And Neville could also be there, perhaps being one of the few who understand Harry's reasons on a deeper level.
It could be that Harry has grown tired of the political games in the wizarding world. He sees all the power - hungry people around him and just can't take it anymore. So he tells everyone to get stuffed and sets out to create a new kind of community or way of life. He might start to gather like - minded individuals who are also fed up with the status quo.
Obviously, Harry would be the main character. There could also be his friends like Ron and Hermione. And perhaps some of his enemies like Draco Malfoy or other Slytherins.
It could be about Harry being frustrated with everyone around him and finally lashing out with the 'get stuffed' attitude. Maybe he's tired of people's false pretenses or constant demands.
There could be his friends like Ron and Hermione. Even though he hates everyone, they would still be important characters as they might try to figure out what's wrong with Harry and how to bring him back from this state of hating everyone.
Perhaps he is trying to hide his true self. He may have a side of him that he doesn't want others to discover, like some special abilities or a different origin. So, being cold to everyone helps him keep his secrets and avoid getting too close to people who might figure him out.
Maybe Harry has had some really bad experiences that made him bitter towards everyone. For example, he could have been betrayed by his friends multiple times.
One possible plot could be that everyone believes false rumors about Harry being a dark wizard. His friends from Hogwarts, including Ron and Hermione, turn their backs on him. Harry then has to find a way to prove his innocence all alone, perhaps by going into hiding and secretly investigating who spread the lies.
The possible negative impacts are numerous. Firstly, it can harm the reputation of the original work. If people associate this inappropriate fanfiction with the original series, it might give the wrong impression of the source material. Secondly, it can be a bad influence on younger or impressionable readers. They might get the wrong idea about relationships and sexual behavior. Lastly, it can lead to a toxic environment within the fan community, where such inappropriate content is allowed to thrive, which may discourage more positive and creative fanfiction from emerging.
Well, perhaps in this fanfiction, Harry has been through so much that he decides to isolate himself from everyone. He might be tired of the constant danger and the expectations placed on him. So he shuts out his friends like Ron and Hermione, and just focuses on his own inner journey, maybe to discover some new magic that he believes can only be found in solitude.
The other students could have a range of reactions. Some might be sympathetic and try to befriend Harry more. Others might be afraid, especially if the abuser is still around. But overall, it would create a stir in the wizarding community, and there would be a general outpouring of concern for Harry's well - being.