There could be a mysterious new student in the fanfic. This new student might have some secrets of their own and befriend Percy. They could be from a different place or have some special powers or knowledge. Additionally, there might be some school janitors or cafeteria workers who play small but important roles in Percy's school experiences, like giving him some good advice or helping him out in a difficult situation.
Well, in a 'Percy Goes to School Fanfic', Percy might face some bully problems at school. Maybe there are some mean kids who pick on him because he's different.
Percy could meet the school bullies. And they might pick on him at first, but then be in for a big surprise when he shows his strength. Also, he might encounter some teachers who suspect there's something different about him. Maybe a science teacher who notices his quick reflexes during an experiment or a history teacher who is amazed by his knowledge of ancient mythology.
Well, Percy might face some academic challenges at Annabeth's school. Since he's used to his own demigod training, normal school subjects could be a bit tough for him at first. For example, he could struggle with math or history classes.
In the fanfic, when Percy goes to Annabeth's school, he could end up in trouble with the school authorities. Since he's not used to a normal school environment, his demigod abilities might cause some chaos. For example, if there's a pool at the school, he might accidentally show off his water - controlling powers. And he'll probably have to deal with normal school stuff like classes and bullies, which will be really interesting to see how he copes with it all.
A really interesting plot twist could be that the school has a secret passage or a hidden room that is somehow related to the demigod world. Percy and Annabeth accidentally discover it while exploring the school. Inside, they find ancient artifacts or prophecies that lead them on a new and dangerous adventure, which might involve traveling to a different dimension or time period.
There could be a school janitor who is actually an old demigod who retired from the hero business. He could give Percy some valuable advice based on his own experiences. And of course, Percy will surely meet Annabeth's classmates, some of whom could be friendly and some not so much, depending on how they react to the new boy in school.
A powerful sorcerer could be the main antagonist. He might be after Percy's powers or trying to use the school as a base to spread chaos. Maybe he wants to open a portal to the underworld right in the middle of the schoolyard.