One possible consequence is that it could lead to a split in their group. If they are part of a team or a community, their animosity could cause others to take sides, creating factions.
It could also result in some intense confrontations. Maybe they end up having physical or verbal battles, which would add a lot of drama to the fanfic. And these battles could have far - reaching effects on the overall story, like changing the outcome of a mission or quest.
Another consequence could be a journey of self - discovery for both of them. Jason might realize that his hatred is unfounded or that he needs to control his emotions better. Percy, on the other hand, might learn to be more empathetic towards Jason's point of view. This could lead to character growth for both characters in the fanfic.
One consequence could be that it divides the fan community. Fans who like Jason might not appreciate Percy being portrayed as hating him, and vice versa. This could lead to arguments and a split in the fandom.
One consequence could be that he might face social isolation in certain situations. For example, in a party or gathering where alcohol is the main feature, Percy would be the odd one out, which could lead to him being excluded from certain social circles within the fanfiction.
One consequence could be a rift in the family. Their relationship might be so strained that it affects the whole family dynamic, causing tension during family gatherings or events.
One consequence could be that Naruto leaves the village. He might go on a journey alone, seeking a new purpose away from the place that has caused him so much pain. This would be a major change from his original story where he was so attached to the village.
He might avoid any events or communities related to magic fanfic. He won't be interested in reading or discussing them.
One reason could be jealousy. Maybe in the fanfic, Annabeth gets more attention or praise for her skills and Percy feels left out or overshadowed, which turns into hatred. Another possibility is that there's a rift caused by their different approaches to solving problems. If Annabeth's logical thinking clashes too much with Percy's more instinctive ways, it could lead to resentment.
One possible reason is that their personalities clash. Percy is often portrayed as a more outgoing and confident character, while Nico is more introverted and brooding. In a fanfic, this could lead to misunderstandings and animosity between them. For instance, Percy's bold actions might seem reckless to Nico, causing him to dislike Percy.
Perhaps they argue over a girl. They are both heroes and might have feelings for the same person. Jealousy and competition could spark an argument between them. Also, their loyalty to different camps, Camp Half - Blood and Camp Jupiter, could be a source of conflict. They might have different ideas on how to handle the relationship between the two camps, which would lead to arguments.
One consequence could be that Percy becomes more rebellious. He might not follow the gods' orders as readily as before, which could lead to all kinds of chaos in the world of the story.
His relationship with Jiraiya could be affected. Jiraiya has a strong connection with the toads, and if Naruto hates toads, it could create a rift between him and his mentor. This could lead to Naruto losing an important source of guidance and support in the fanfiction.