Well, in the Percy Jackson books, there's no mention of Percy Jackson Goode reading Percy fanfiction. Fanfiction is more of an outside - the - official - story thing created by fans. It's not really part of the main plot or something the characters would typically be involved in. So, it's very likely that he doesn't read it.
One common theme is the struggle to fit in. Percy is a demigod in a normal high school, so he has to hide his true identity while also trying to be like the other students. Another theme is friendship. He often forms new friendships at Goode and has to navigate how those relationships work with his demigod life.
It's possible that they have an adventure related to a school project gone wrong. For example, if they are doing a project on Greek mythology and accidentally summon a minor deity or a mythical creature. Then they have to figure out how to send it back without causing chaos in the school and also keep it a secret from the regular students.
If Percy Jackson Goode read Percy fanfiction, he might first be a bit shocked at how fans have taken his story and spun it in different directions. He could find some versions where he's portrayed in a completely different light than he sees himself. However, he might also gain some new perspectives on his own adventures and relationships, seeing how fans view them from the outside. It could also make him more aware of his popularity among fans and the impact his story has had on them.
In this fanfiction, Percy might face new challenges at Goode. Maybe there are new monsters lurking around, or he could be dealing with old enemies who have a new plan. Also, his relationships with his friends at Goode could develop further, like his friendships might get deeper or he could even find a new love interest.
He could interact with his old friends at Goode, like Rachel. She has a special connection to the demigod world, and their relationship could be further explored. Also, there might be new teachers or students that Percy meets. Maybe a new student who is actually a demigod in hiding too, and they start to figure out each other's secrets.
The fanfiction could start with Percy reluctantly taking on a teaching job at Goode. He tries to keep his demigod identity a secret at first. But then strange things start happening at the school, like students having prophetic dreams or unexplained disappearances. Percy realizes he has to use his knowledge and powers to solve these mysteries and also teach his students about the hidden world of gods and monsters. He might even bring in some of his friends from Camp Half - Blood to help out.
In the 'Percy Jackson returns to Goode' fanfiction, it could be that Percy has to face some challenges related to his dual identity. On one hand, he is a normal student at Goode, on the other, he is a demigod. This could lead to some interesting situations where he has to balance between the two worlds. For example, he might have to hide his demigod skills during a school competition but still manage to win in a rather unexpected way. Also, there could be new characters introduced, perhaps a new demigod who also attends Goode and Percy has to team up with them to face a common threat.
Well, it could be about their adventures in Goode High. Maybe they're facing some new mythical creatures that are lurking around the school. They might be trying to keep their demigod identities a secret while also dealing with normal high school stuff like exams and making friends.