One idea could be to explore Percy's life in exile and how he copes with being away from his friends and the world he knew. Maybe he discovers new powers or forms unexpected alliances. Another could be that he's exiled to a realm filled with ancient and forgotten creatures, and he has to find a way to survive and potentially return home.
Well, you could have Percy exiled to a modern city where he has to hide his demigod identity completely. He might start having strange dreams about his past and future, which could lead him on a quest to find a way to reverse his exile. Also, perhaps he meets other exiled demigods and they team up to create a new safe haven for themselves.
One idea could be Percy being exiled to a forgotten part of the mythological world, like a lost island where ancient and dangerous creatures lurk. He has to learn their ways to survive and find a way back to his friends.
One interesting plotline could be Percy trying to find a way to return home while facing new and unexpected challenges in his exile. He might encounter strange creatures or make new allies.
One idea could be a fanfiction where Percy and his friends go on a new quest in a modern, urban setting. Instead of the usual mythological locations, they have to deal with monsters hiding in big cities. Another idea is a story that focuses on the relationships between the characters in a more in - depth way, like exploring the friendship between Percy and Grover during their off - quest times. And a third idea could be a time - travel fanfiction, where Percy gets sent back to the time of the ancient Greek heroes and has to interact with them while still holding onto his modern values.
One idea could be to explore Percy's life after he has fully mastered his powers. Maybe he goes on a quest to find a long - lost relative who also has demigod powers. Another could be a story where Percy and his friends have to deal with a new type of monster that is immune to their usual weapons and they have to find a creative way to defeat it.
Perhaps in the fanfiction, Percy could experience a mental collapse. This could be due to all the pressure and trauma he has faced over the years. His friends might have to find a way to bring him back from this dark place, and in the process, we could see deeper relationships develop among them. For example, Annabeth could use her knowledge and their shared history to reach Percy on a different level.
Another concept could be that a powerful ancient evil is affecting both the Percy Jackson universe and Arendelle. Elsa and Percy are the only ones who can sense it at first. They must team up, traveling between their two worlds, to find the source of the evil. Along the way, they learn about each other's powers and cultures, and their combined powers are the key to defeating the evil.
One idea could be a crossover where Harry and Percy meet in a magical realm that combines the wizarding world and the world of Greek gods. They could team up to fight a common enemy, like a dark wizard who has also angered the gods.
One idea could be a fanfiction where a character gets a tattoo of Percy's sword, Riptide. The tattoo could have magical properties in the story, like glowing when danger is near. Another idea is a tattoo of the Camp Half - Blood logo. It could be a symbol of pride for a demigod character in the fanfic, and maybe it was given to them as a mark of their belonging to the camp.
Another interesting concept is a story where Percy Jackson is somehow transported to the Marvel universe. He could use his water - controlling powers in unique ways there. Maybe he'd join forces with Namor, the Sub - Mariner, and they'd have an underwater adventure together, facing off against some underwater threat that only their combined powers could handle.
In Ambrosia Percy Jackson fanfiction, one interesting idea could be new uses of ambrosia. For example, it might be used to heal not just physical wounds but also emotional traumas. Some fanfictions may explore how different characters react to ambrosia in unique ways. Like a new demigod who has never tasted it before might have a very different experience compared to Percy.