Another plot could be Percy getting lost in a magical forest that changes its layout constantly. He teams up with some magical creatures that live there, like a talking fox and a flying squirrel. Together they try to find the exit of the forest and along the way, Percy discovers secrets about his own powers.
One interesting plot could be Percy encountering a long - lost civilization. Maybe he stumbles upon a hidden tribe that has unique powers and a different way of life. He has to learn their ways to survive and also figure out how their existence relates to the world he knows.
Some fanfictions might also include new characters created specifically for the story. For example, a mysterious wizard who helps Percy understand the magic of a particular region he is in. This wizard could have his own motives and secrets that add more depth to the story.
One interesting plot could be Percy finding himself in a world where the Greek gods have different forms or powers. For example, Zeus could be a benevolent king instead of the often angry god we know. Percy would have to navigate this new world, figure out how to use his own powers in relation to these changed deities, and perhaps find a way back home. Another plot could involve Percy being sent to a world that is a blend of different mythologies, like Greek and Norse. He'd have to deal with new creatures and gods from both mythologies, which would be a real challenge.
One interesting plot could be Percy and his friends going on a quest in a new, undiscovered part of their magical world. Maybe they encounter a rare and powerful magical creature that they have to either befriend or defeat to complete their mission.
One interesting plot could be Percy having to prove himself to Poseidon in a new and unexpected way. For example, he might have to solve a mystery that is directly related to Poseidon's power over the sea but in a realm that is unfamiliar to both of them, like an underwater civilization that has been lost for centuries.
One possible interesting plot could be Percy's struggle with immortality. He might face the loneliness of outliving his friends and loved ones. Another could be how he uses his immortality to protect the world in new and different ways, perhaps by being able to take more risks without the fear of death.
One interesting plot could be Percy having to deal with new mythological threats while trying to balance his college studies. For example, a group of rogue satyrs causing chaos on campus. Another plot might involve Percy and his friends forming a secret society in college to protect the mortal world from hidden magical dangers. And sometimes, there are plots where Percy has a love interest who is also involved in the world of Greek mythology and they face challenges together in the college setting.
One interesting plot could be Percy and his friends going on a quest in a new, unknown realm. Maybe a place that's not part of the regular Greek mythology but still related in some way.
A great plot might involve Percy and Calypso going on a quest to save a group of demigods. Along the way, they face various monsters and challenges, and their relationship deepens as they rely on each other. They could also discover some hidden secrets about the gods during this quest.
Perhaps a plot where Percy forms an unlikely alliance with some of the more neutral or even hostile creatures in Tartarus. He could use his charm and wits to convince them to help him in his struggle against the greater evils of that place. In this way, he learns more about the complex hierarchy and politics within Tartarus.
One interesting plot could be Phoebe joining Percy on a quest. Maybe she has some unique powers that help them overcome the challenges they face, like being able to communicate with certain mythical creatures that Percy can't. This could add a new dynamic to the typical Percy Jackson quest.