It might start by showing Naruto's first encounter with the gods. Maybe he witnesses an act of godly power that he finds disturbing or unjust. This initial reaction could set the stage for his growing hatred.
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.
Probably Poseidon, as he is Percy's father and has a vested interest in his son's well - being. Zeus might also be protective in some cases, despite their past differences, as Percy is a hero who often saves the world which benefits Zeus's realm as well.
Well, without reading the specific fanfiction, it's hard to say exactly who Percy is. But generally, in a 'champion of the gods' scenario, Percy would be a central figure. He might be a hero with unique powers, like being able to control certain elements or having superhuman strength. He could be a character who has to face various challenges and tasks on behalf of the gods, kind of like a chosen one in a fantasy story.
Well, it could be that Percy has had some really bad experiences in his life that made him bitter towards everyone. Maybe he was betrayed by friends in the past, so now he just can't bring himself to trust or like anyone.
One thing that could be done is simply respect his opinion. Don't try to force him to read or like poker fanfiction. If others like it, they can enjoy it among themselves without involving Percy.
If someone really wants Percy to at least tolerate it, they could try to find beer fanfiction that is more tastefully done or that has a different take on the concept. Maybe some fanfiction that uses beer in a more symbolic or light - hearted way rather than in a way that might be off - putting to Percy.
Zeus is a possibility. As the king of the gods, he might see Percy's potential and adopt him to have an ally among the demigods. Another could be Poseidon, since Percy is already his son in the original story. It would be an interesting twist to have Poseidon formally adopt Percy in a more divine way.
The gods might show their protection in various ways. For example, they could directly intervene in battles Percy is in, using their divine powers to shield him from harm. They might also send him signs or omens to guide him away from danger.
Zeus is often one of the main gods showing possessiveness. He sees Percy as a powerful asset or a potential threat, so he wants to keep Percy in check. Poseidon, as Percy's father, also shows possessiveness in a different way. He wants to protect Percy but also use his powers for his own purposes sometimes.