It can be considered normal. People often get interested in fanfiction for various reasons. In this case, Percy's brother might like Annabeth fanfiction because he admires her character traits in the original story. The fanfiction could offer new perspectives on her, or it might be that he simply enjoys the writing style of the particular fanfictions he reads.
It could mean that Percy, as a character or a person named Percy, has an interest in the fictional stories created by fans about Annabeth. Maybe he enjoys the different interpretations of Annabeth's character, relationships, or adventures in these fan - made stories.
It could bring them closer. Percy might find it endearing that Annabeth likes fanfiction about them, and it could lead to more open conversations between them about how they are perceived by fans.
One possibility is that it reveals her creative side. Fanfiction can be very creative, and by liking it, she may be drawn to the unique ideas and storylines that fans come up with. It could also suggest that she's a bit of a fangirl herself, not just in the context of the original story but also in the world of fan - created content about her and Percy.
One reason could be that he enjoys the creativity of the fanfiction writers. They might come up with interesting storylines involving Annabeth that he finds really engaging. For example, they could create new adventures for her or explore her relationships in more depth. Also, if he likes the world of Percy and Annabeth, the fanfiction gives him more of that world to explore. He can immerse himself in different scenarios with Annabeth as the central figure, which is exciting for him.
Maybe they were just having a casual conversation about their interests in different fictional works related to their group. Since Percy is an important character in their story, Annabeth might have discovered some really well - written Percy fanfiction that she couldn't help but share her liking for with Thalia.
Maybe he likes it because he has a deep connection with Annabeth in the original story and the fanfic allows him to see different interpretations of their relationship.
In a large number of Percy and Annabeth fanfictions, they are indeed presented as soulmates. Their shared adventures, the way they understand each other without many words, and the deep loyalty they have for one another all contribute to this perception. Fanfiction authors often build on their existing relationship from the original works and enhance it to the level of soulmates. They might show it through things like Percy being able to sense Annabeth's distress from afar, or Annabeth always knowing exactly what Percy needs in difficult situations. This soulmate - like relationship makes for very engaging and heart - warming stories in the fanfiction realm.
It could be that Annabeth has a misunderstanding about Percy. She might think he's a threat to her position or status at the camp, so she bullies him to try and keep him in check.
It could be Chiron, the centaur. He's always keeping an eye on the campers and would likely be concerned if he caught them up to something. He might give them a stern talking - to and some extra chores as punishment.