Perhaps Harry discovers a dark secret about humans that makes him despise them. For example, he could find out that humans are using magic in unethical ways that harm other magical beings. This realization makes him turn against humans. He might start to form alliances with non - human magical creatures and work towards stopping human - led magic misuse. The plot could involve a lot of internal struggle for Harry as he once was part of the human world and now has to fight against it.
Well, it could start with Harry having a really bad experience with a large group of humans. Maybe he was wrongly accused by a mob of humans and almost lost his life. This trauma makes him view all humans as untrustworthy and cruel. As a result, he decides to live in seclusion, away from humans. But then, certain events might force him to interact with humans again, like a threat to the magical world that only he can stop. However, his hatred still lingers, and he has to deal with his emotions while trying to save the world that he has grown to loathe.
One possible plot could be that Harry has been repeatedly betrayed by those he trusted, all of whom are humans. This string of betrayals causes him to gradually develop a hatred for all humans. He might then go on a journey to isolate himself from human society and seek revenge on those who wronged him.
One possible reason could be the betrayal he faced from some people in the wizarding world. For example, some students at Hogwarts might have spread false rumors about him or treated him unfairly because of his fame as 'The Boy Who Lived'. This could have led him to develop a general dislike for humans.
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.
It's possible that the plot could start with some kind of mind - control or brainwashing of Harry. Then, he would start to spread hatred towards Mudbloods in Hogwarts. This would cause a great divide among the students. There could be battles between those who support Harry in his new - found (but false) beliefs and those who oppose him. But again, this is a very dark and untrue - to - the - original - spirit plot that goes against the core values of acceptance and friendship in the Harry Potter series.
Perhaps in this fanfiction, the author has imagined a completely different backstory for Harry. Maybe he was somehow mistreated by humans in this alternate story from a very young age. This continuous abuse or neglect could lead to him hating humans. But in the official Potterverse, Harry is a symbol of love and hope and friendship among humans, so this is a huge deviation. It could also be that the writer is exploring some complex psychological concepts by making Harry hate humans, like the effect of long - term isolation or extreme trauma on a person's view of humanity.
One possible reason could be betrayal. If Naruto was constantly let down or betrayed by those he trusted among humans, it could lead to his hatred. For example, if his friends turned on him because of his jinchuriki status.
One possible plot could be that there is a powerful, but corrupting magical artifact in the story. Harry comes into contact with it and it starts to warp his views. He begins to show disdain for those considered mudbloods. But as the story progresses, his true friends try to show him the error of his ways and help him regain his original, inclusive self.
One possible reason could be that the 'light' in the fanfiction represents something he associates with strict rules or a false sense of goodness. Maybe it has been used to manipulate people, and Harry, being perceptive, sees through it and thus hates it.
There could be such a 'harry hates humans fanfiction'. However, it's not a very common or mainstream concept. It might be a more niche or dark take on the character. Maybe some independent authors have explored this idea, but it's difficult to point to one without really delving deep into the fanfiction communities and their libraries. It could also be that this is a very specific or even self - created concept that hasn't been widely explored in the general fanfiction world yet.
Perhaps the plot could revolve around a magical accident or curse that makes Harry lose his ability to feel positive emotions towards others. As a result, he starts to hate everyone. He begins to act out against the people he once cared about, causing chaos in Hogwarts and the wider wizarding community. His friends would be shocked and try to find a way to reverse the effect, but Harry would resist their attempts.
In this fanfiction, perhaps there's some miscommunication. Maybe the Weasleys' boisterous nature is misconstrued by Harry. For example, their large family dynamic might be overwhelming to him at times, which could be a reason for the 'hate' in the fanfic.