One possible reason could be that Naruto's brother was involved in some important event or prophecy that made the family and the village believe he is more crucial. Another factor could be that Naruto made some mistakes in the past that led the family to shift their attention more towards his brother. Additionally, the brother might have a better reputation in the village, for example, being more helpful or polite, which makes Naruto get neglected in comparison.
Perhaps there are family secrets or misunderstandings. His family might have some hidden agenda or past issues related to Naruto's brother that make them focus more on him. It could also be that Naruto's brother is seen as more compliant with the family's traditions and expectations, while Naruto is more of a free - spirit, which causes the neglect.
Maybe the brother is seen as more obedient and studious. In a ninja village, those traits are often highly valued. Naruto, on the other hand, is very boisterous and doesn't always follow the rules. So, in the fanfic, the family or those around them might give more attention to the brother. Also, it could be that there's some sort of prophecy or family legacy associated with the brother that overshadows Naruto, causing the neglect.
Perhaps there has been a misunderstanding. Maybe Harry did something that was misinterpreted by his mates, leading to their neglect.
One possible reason could be jealousy. Maybe his brother has some special abilities or gets more attention that Naruto feels he should have. For example, if his brother is really good at a certain jutsu and is always praised for it while Naruto struggles, that could lead to resentment.
It could be a misunderstanding. Perhaps Naruto was involved in an incident where his actions were misinterpreted by his brother. For example, Naruto might have accidentally caused harm to someone his brother cared about while trying to do something good, and his brother didn't get the full story and started to hate him as a result.
In fanfiction, Naruto could be disowned by his father because of secrets. Suppose his father had some dark secrets in his past that Naruto unknowingly got involved with. His father might disown Naruto to keep those secrets buried. Or perhaps Naruto's father was under the influence of some dark magic or mind - control that made him act against his normal feelings for Naruto. It could also be a case of a prophecy that led his father to believe Naruto was a threat to the village in the future, even if there was no real evidence yet.
Well, perhaps in the fanfiction world, Naruto's parents discover some kind of 'dark power' within him that they fear might be uncontrollable. They think that banishing him is the only way to keep the village safe from this potential threat. This could be a power that is different from the Nine - Tails' chakra and seems extremely dangerous to them.
One reason could be that other characters might be more popular among fanfiction writers. For example, if there are more glamorous or complex characters in the same universe, they might overshadow Percy. Another reason could be that the storylines involving Percy are not as easy to explore in fanfiction. Maybe his character arc in the original work is so straightforward that it doesn't offer much room for creative reinterpretation.
One reason could be that his siblings have some special abilities or talents that overshadow Naruto. In the ninja world, those with unique powers often get more attention. So, if his siblings possess something extraordinary, Naruto might be pushed to the side.
One possible reason could be that the clan fears his power. In some fanfictions, Naruto's growing strength and his potential to disrupt the clan's traditional power structure might lead to his exile. They may see him as a threat to their established ways.
In some fanfictions, Naruto might be hated by his friends due to a misunderstanding. For example, if there's a false rumor spread about him being a traitor. Another reason could be his sudden increase in power that makes his friends jealous. Maybe he accidentally harms one of them during a training session and they hold a grudge.