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.
Perhaps there's a fanfic where a powerful magical creature takes Harry away from his parents. Maybe a phoenix, believing that Harry is in some sort of immediate danger from dark forces that his parents can't protect him from, decides to carry him off to a magical sanctuary. There, Harry grows up among other magical creatures and has to learn about his own powers and heritage in a very different way compared to the original story.
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.
One possible plotline could be that Harry runs away because he's tired of the constant danger at Hogwarts. He might find a hidden magical place where he can practice magic in peace and discover new spells on his own.
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.
Perhaps Naruto's parents were cursed or had some sort of premonition about a great danger coming to Naruto if he stayed with them. They believed that by separating from him, he would have a better chance of survival. Fanfiction writers often explore these kinds of emotional and complex scenarios to give a different perspective on Naruto's origin.
Another idea is that there is a powerful dark wizard other than Voldemort at Hogwarts. This wizard has been hiding in plain sight all along. In Harry's fourth year, he decides to make his move. He uses a powerful dark spell during one of the Triwizard events. Harry, being in the wrong place at the wrong time, is directly affected by the spell and dies instantly, without anyone really knowing who was behind it at first.
One possible plotline could be Harry feeling extremely lost and alone at first. He might have to find a new place to live, perhaps with the help of his friends like Ron and Hermione. He could struggle with self - worth, constantly wondering what he did wrong to make his parents disown him.
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.
One possible plotline could be Naruto trying to find a way to visit the Harry Potter world. He might search for some kind of magical portal or a powerful spell that can transport him there. Another plotline could be Naruto using the ideas from Harry Potter books to improve his ninja techniques. For example, he could learn about the concept of wandless magic and try to apply it to his chakra control.