Well, it can enhance your creativity. When you read fanfiction about Percy Jackson and Harry Potter, you get exposed to various writing styles. Some fanfictions might take a really unique approach to the magic systems or the character development. And it's a great way to keep the love for these series alive. You can continue to be immersed in the worlds even after finishing the main books.
One benefit is that it allows for more exploration of the universes. Fanfiction often delves deeper into characters' backstories or creates new relationships that might not be explored in the original works. For example, in Percy Jackson fanfiction, you might find stories that focus on minor gods or new demigod characters. It also gives fans a chance to see different interpretations of the magical worlds, which can be really exciting.
Reading such fanfiction can also be a form of community. Fans who write and read these stories often form groups and discuss their favorite fictions. It helps in building a sense of belonging among fans. Additionally, it can introduce you to new ideas. Maybe a fanfiction writer has a completely different take on how Hogwarts should be run or what the Olympian gods are really like in modern times.