Some fanfictions might explore a plot where Percy and Audrey are from different magical factions that are usually at odds. But they meet and gradually fall in love. They then have to deal with the opposition from their respective groups. They might also have a plot where they accidentally swap their magical powers for a short time. This leads to a series of comical and also enlightening situations as they learn to adapt to each other's powers.
The main characters are Percy and Audrey, of course. Percy is often depicted as a brave and powerful character with unique magical abilities. Audrey, on the other hand, might be portrayed as a strong - willed and intelligent character, perhaps with her own set of special skills or knowledge.
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.
A really cool plot could be that Gohan and Naruto get transported to an alternate dimension where they have to find a way back home. Along the way, they meet different versions of their friends and foes, and they have to work together to overcome the challenges of this strange new world. They might also discover some secrets about their own powers and the nature of their universes in the process.
One interesting plot could be Rocket and the raccoon going on an intergalactic adventure together, facing strange alien creatures and solving mysteries along the way.
There could also be a plot where Magnus and Max are from different dimensions or time periods and accidentally meet. At first, they don't understand each other because of the differences in their worlds. But as they start to communicate and learn about each other's cultures and powers, they find common ground. They might have to work together to find a way to get Max back to his own time or dimension, and in the process, they create memories and a relationship that changes both of them for the better.
One possible plot could be Thea and Barry teaming up to solve a mystery in both their cities. Maybe there's a meta - human causing trouble in Star City and also has some connection to Central City's problems.
One interesting plot could be Sonic and Maria teaming up to save a parallel universe. They use Sonic's speed and Maria's intelligence to overcome various obstacles.
One interesting plot could be that Harry and Pansy are forced to work together on a school project in Hogwarts. At first, they dislike each other due to their house differences. But as they spend more time together, they start to understand each other better and discover they have more in common than they thought. For example, they both have a love for magical creatures, though Pansy is a bit more hesitant to show it at first.