In some fanfics, a time - traveling accident might cause Harry to be taken away from his parents. For example, if a wizard from the future accidentally creates a rift in time while trying to save Harry from Voldemort in a different way. They end up pulling Harry into the future, separating him from his parents in the past. This could lead to a story where Harry has to find a way to get back to his own time and reunite with his family, all while dealing with the strange future world he's landed in.
If Harry was taken away from his parents in a fanfic, he might be more distrustful. Without the love and security of his parents in his early years, he could have a harder time forming close relationships. He may also be more self - reliant, having to figure out things on his own from a young age.
One possible reason could be that he discovers a dark secret about his family. Maybe he finds out that his parents were involved in something dangerous or unethical in the wizarding world, and he can't bear to be associated with it, so he runs away.
He could go to Hogwarts early. Since he has some connection to the school already through his parents, he might think that the school could be a safe haven. There are also his friends' families there, like the Weasleys, who might take him in.
The original Harry Potter story has a strong family - love - centered theme. Harry's parents' love for him was so strong that it protected him even after their death. In the 'Harry Potter hates his parents' fanfic, this central theme is completely changed. It's a deviation that changes the whole dynamic of the relationships in the story. It's like changing the core of a flower, everything else about the story will be affected, such as Harry's relationship with his friends who also respected his parents.
One possible reason could be that in the fanfic, the author might twist the story to make it seem like his parents' actions had unforeseen consequences that affected Harry negatively. For example, their fight against Voldemort led to Harry being an orphan and having to bear a great burden from a young age.
Maybe he discovers some dark secrets about his family. For example, if his parents were involved in something he considered unethical in the fanfic's plot. It could be that they were part of a group with a hidden and evil agenda.
One possible reason could be that he might feel abandoned. Growing up without them, he could resent the fact that they left him an orphan. He might think that if they were really so great, they would have found a way to survive and be there for him.
Yes, there might be some extremely dark and out - of - canon fanfictions out there with such a disturbing premise, but it goes against the general nature of the original story where Harry's parents loved him deeply. However, in the vast world of fanfiction, people can create all kinds of strange and often inappropriate scenarios.
It could be that the paperwork reveals some hidden magical secret or legal loophole that enables the revival. Maybe it involves ancient spells or forgotten magic rituals documented in the paperwork.