Perhaps it's due to some misunderstandings. In the world of fanfiction, there could have been situations where Artemis' actions were misinterpreted by Percy. For example, if she took a stance that seemed to oppose Percy's friends or his own goals in some way, that could fuel his hatred.
One possible reason could be differences in their divine natures. Percy is a son of Poseidon, a god associated with the sea and a more fluid, emotional element. Artemis is a virgin goddess of the hunt, very strict and unyielding in her ways. This contrast in their essences might lead to clashes and Percy's dislike.
Perhaps Percy hates it because it creates a lot of plot holes and inconsistencies in the world he knows. If there's a son of Artemis in fanfiction, it might mess up the way the gods' relationships and powers work in the original story.
One possible reason could be a misunderstanding. Maybe Percy accidentally disrupted one of Artemis's hunts or sacred rituals in the fanfic. Another reason might be that some prophecy or fate in the fanfic's made - up world has pitted them against each other. For example, if there's a prophecy that Percy's actions will somehow limit Artemis's power or freedom in the future.
One possible reason could be a misunderstanding. Maybe there was some miscommunication or false information spread that made Artemis think Percy had done something unforgivable. For example, if Percy was wrongly accused of harming one of Artemis' beloved creatures or desecrating her sacred places.
One possible reason could be jealousy. Maybe Percy gets more attention or recognition in their fictional world that makes Annabeth envious and thus appear to hate him.
One possible reason could be that Naruto, coming from his own world with its own power system, might view the gods in Percy Jackson's world as too powerful and controlling. He's used to relying on his own ninja skills and the power of friendship, and the idea of these all - powerful gods might seem unfair to him.
It might be due to the way their goals are presented in fanfiction. Naruto is often about protecting his village and friends. If Artemis's goals in the fanfic are in conflict with Naruto's, like if she's more focused on her own self - interest in the story, Naruto would hate her.
One possible reason could be that Percy has shown great courage and a pure heart. Artemis might see in him the potential to be a great ally in the fight against the forces of chaos. Maybe Percy has also done something to earn her respect, like saving one of her hunters or standing up for what's right in a situation that involved her domain.
One reason could be that Percy is loyal to Annabeth. In the original series, his relationship with Annabeth is strong, and he might not want to betray that for Artemis. Artemis is also a virgin goddess, which adds a layer of complexity to any potential relationship.
One possible reason could be a misunderstanding. Maybe Artemis misinterprets Percy's actions as being against her or her hunters. For example, if Percy accidentally endangers one of her hunters during a quest, Artemis might see it as a betrayal of her trust in him.
Well, perhaps in this fanfiction, Artemis betrays Percy for Orion due to a prophecy. There could be a prophecy that states that Orion and Artemis together will bring about some great change or prevent a huge disaster, and Artemis believes she has to choose Orion over Percy to fulfill it. Also, Orion might have some sort of leverage over Artemis that forces her to turn her back on Percy.