A more dramatic plot could be that Jason and Percy are both framed for a crime they didn't commit within the demigod world. They are forced to go on the run together, hunted by both camps. As they are on the run, they discover a conspiracy that goes much deeper than they thought. They must rely on their wits and each other's friendship to clear their names and expose the real culprits behind the frame - up.
One idea could be Jason and Percy having to team up for a special quest that no one else can handle. Maybe they have to retrieve a powerful artifact hidden deep in a dangerous realm. They start off not getting along well because of their different leadership styles, but as the quest progresses, they learn to respect each other and combine their powers in unique ways to overcome obstacles.
One interesting fanfiction could be about Jason and Percy teaming up for a super - difficult quest. They might use their unique powers in tandem, like Percy's water - related abilities and Jason's control over the wind. It could involve them facing a new, powerful monster that neither has encountered before.
A plot where the demigods have to team up with their mortal enemies, like some of the monsters, in order to face a greater threat that endangers both their worlds. This could lead to some really interesting character dynamics and moral dilemmas.
A great fanfiction idea is to have the heroes of Olympus time - travel. They could go back to the time of the ancient Greek heroes and interact with them. Maybe Percy meets Theseus and they have to compete in some sort of challenge. Or the story could focus on a character like Nico di Angelo and his journey to discover more about his powers in a place that is off - limits to most demigods, like the Underworld's deepest secrets. There could also be a fanfic where the demigods have to deal with a curse that affects their powers in strange ways.
One idea could be exploring the backstories of minor characters in more depth. For example, you could write about the early life of a demigod who was only briefly mentioned in the original series. Another idea is to create alternate endings to the main story arcs, like what if the heroes had made different choices during a crucial battle? You could also focus on the relationships between the characters in a different light, perhaps showing a friendship that was hinted at but not fully developed.
One idea could be a new prophecy that involves the demigods having to travel to an unknown realm to retrieve a powerful artifact before the Titans use it to destroy the world. Another could be a fanfic where the demigods form an alliance with some previously thought - of - as - enemies, like certain monsters who also don't want total chaos. Or perhaps a story where a demigod discovers a hidden power within themselves that has the potential to change the balance of power between the gods and the Titans.
One idea could be that the heroes travel back in time to the founding of Camp Half - Blood and have to deal with the very first demigods. They might face challenges like different rules and more primitive living conditions. Another could be going back to a time when the gods were at war with each other more openly and getting caught in the middle of it. Maybe they travel forward in time and see a future where the demigod world has completely changed, like new alliances between different pantheons.
One way to find great authors of Jason and Percy fanfiction is to ask in fan communities. Some fans might recommend an author who has a really creative spin on the relationship between the two. Maybe there's an author who writes a lot about their backstories, or one who creates alternate universes where Jason and Percy have different roles or abilities, which can be really exciting to read.
One idea could be Percy having to face a new, unknown monster that is immune to water. He'd have to rely on his other skills and the help of his friends in a completely different way.
Perhaps a story where Jason and Piper have a falling out over something, like a misunderstanding about Piper's past. But then they work through their issues and come out stronger in their relationship, learning more about each other and themselves in the process.
In a Percy Jackson Warrior of Olympus fanfiction, a great plot could involve Percy being sent into the future of the demigod world. He sees the consequences of the current actions of the gods and demigods. For example, he discovers that a war between the different pantheons has led to the destruction of many demigod camps. So, he has to go back in time and try to change the events that lead to this future. This would involve him having to convince not only his friends but also the gods to change their ways, which would be no easy feat as the gods are often stubborn. He might also meet some of his descendants in the future, and they could help him understand what exactly went wrong.