It could also be a plot device to create a new and different story arc. The author might want to show a post - destruction world where the characters have to rebuild and reevaluate everything. Percy's destruction of the camp could be the catalyst for a whole new set of adventures and character developments.
One possible reason could be a dark turn in his character. Maybe he's been corrupted by some external force like a powerful and evil magic. Another reason might be a misunderstanding. For example, he believes the camp has betrayed him in some way, so he lashes out in anger.
He might leave because of a personal conflict. Perhaps he has a falling - out with some of the other campers or with the camp leaders. Like if he disagrees with a new rule or policy that the camp has implemented which he thinks is unjust.
One reason could be that he doesn't like how the fanfiction writers change the storylines. For instance, they might create romantic relationships for him that he doesn't approve of. It's like his own story is being rewritten without his consent.
There could be new challenges waiting for him at the camp. Maybe a new prophecy that involves him and he has to quickly get back into the action of training and preparing. He might also find some changes in the camp, like new cabins or new campers who look up to him.
The betrayal of Percy by Camp Half - Blood in fanfiction can also be a way to show Percy's growth and resilience. He has to face the ones he considered family turning against him. This can lead to some really interesting character development arcs, where Percy has to re - evaluate his loyalties and find new allies or even learn to rely more on his own strength.
In fanfiction, if Percy hurts Flash, it could be due to Flash's constant bullying. Percy, being a demigod, has powers and a short temper at times. Flash might push him too far, and Percy could accidentally use his powers, like controlling water to trip Flash or something. It would be a moment of self - defense for Percy, and it could lead to a lot of drama in the Camp Half - Blood setting, with other campers having to take sides or deal with the consequences of such an incident.
Maybe he hates it because it often misrepresents the real Camp Half - Blood or his friends. Fanfictions sometimes take wild liberties with the characters and settings, and Percy might not like how his world is being distorted.
One common theme is the struggle between power and morality. Percy often has to deal with Hades' power and the moral implications of interacting with him in the Camp Half - Blood. Another theme is friendship and loyalty. Despite Hades' reputation, Percy might show loyalty to him in some fanfics. And the theme of self - discovery is also there. Percy could learn more about himself through his experiences with Hades in the camp.
One reason could be that he feels a sense of being out of place. Maybe new campers have come in and he no longer feels as important or needed. He might also leave in search of a greater purpose. In some fanfictions, he could be on a quest to find something that he believes is crucial for the safety of the camp, but he has to leave the camp itself to do it.
One idea could be a story about Percy's sister who was hidden away and discovers her true identity when she arrives at Camp Half - Blood. Another could be a time - travel fanfic where Percy goes back to the early days of the camp and has to deal with different versions of the gods. Or perhaps a story where Percy and his friends have to face a new, unknown monster that is immune to water, which really challenges Percy's powers.
A fanfiction titled 'Percy and the Forbidden Realm' is also quite good. It takes Percy into a realm that is off - limits in the normal world of the series. He has to navigate through strange and dangerous landscapes while dealing with his own internal struggles. The author does a great job of building the atmosphere of this new realm and making Percy's journey both challenging and thought - provoking.