Perhaps Percy would feel a sense of pride. Knowing that his story has inspired others to create their own versions shows that his adventures have had an impact. He might also be a bit surprised at some of the wild ideas that fans come up with, but overall, it could be a positive experience for him.
Well, he might gain new perspectives on the events and characters in 'The Son of Neptune'. Maybe he'll find alternative versions of his own actions or the actions of his friends interesting. It could also make him reflect on how others view the story.
There's a fanfiction called 'Percy's Hidden Powers in Son of Neptune'. In this one, Percy discovers new powers that are unique to the events in 'Son of Neptune'. The author does a great job of tying it in with the existing mythology and the plot of the original story. It's full of action and some really cool fight scenes.
One possible plot idea could be Percy reading it and getting new insights into the story, which then helps him in his own adventures. For example, he might find a hidden clue in the fanfiction that relates to his real - life challenges.
There could be some on Archive of Our Own as well. It has a vast collection of fanfictions. You need to be a bit more specific in your search though. Maybe add some tags like the genre you prefer, whether it's action - packed or more of a character - study type where Percy reads 'The Son of Neptune'.
It could also strengthen his bond with his friends. Realizing that others are interested in their story and are creating their own versions of their relationships could make Percy feel closer to his friends. He might even share some of the interesting fanfiction ideas with them and have a good laugh together.
He could become more self - aware. If the fanfic portrays him in a certain way, he might start to think about whether he really is like that. For example, if the fanfic shows him as being more heroic than he thinks he is, it could boost his confidence.
One idea could be Percy forming an unexpected alliance with a minor Roman god. In the fanfiction, this god could have a unique power that helps Percy in his quests. For example, a god of illusions who can create decoys to mislead Percy's enemies.
A character like a demigod with the power to control time could be really interesting. This character could be from a minor god's lineage. They could use their power to help Percy in battle, for example, by freezing time for the enemies while Percy attacks.
The popularity comes from the love for the original Percy Jackson series. Fans want more of the story. 'Son of Neptune' has a rich world and great characters. Fanfictions allow people to explore different scenarios and relationships that they wished were in the original book.