Well, they could go on an amazing adventure together. Percy could use his water - controlling powers and Star could use her magic wand. Maybe they'd fight some mythical creatures that are a mix of the Greek mythology ones Percy knows and the magical ones from Star's dimension.
They might start off being a bit suspicious of each other. Percy would wonder about Star's out - there appearance and magic, and Star would be curious about Percy's sword and his claims about Greek gods. But eventually, they'd start to work together and become friends.
In this fanfiction concept, imagine Savitar being from a different dimension and accidentally stumbling into the Percy Jackson universe. He doesn't understand the rules at first. The demigods are initially scared of him because of his speed and strange powers. But Annabeth, being the smart one, figures out a way to communicate with him. Through their interactions, Savitar starts to question his own motives and actions, leading to a character arc where he may even end up helping the demigods against a greater threat.
Percy would likely be very critical of their lifestyle. He comes from a world where family is important and they support each other in the face of danger. The Dursleys, on the other hand, seem to shun anything out of the ordinary and are unkind to Harry. Percy might try to show them a different way of living, with more love and acceptance, though they probably wouldn't listen.
In this fanfiction, perhaps they would team up to fight a common enemy. Star Butterfly's unique magical powers combined with Naruto's strength as a ninja would make for an interesting battle. They could be in a world that has elements of both their universes, and they'd have to figure out how to work together. For example, Naruto could use his speed and stealth to get close to the enemy while Star Butterfly uses her magic to distract or weaken the foe from a distance.
A typical scenario could be Percy seeking Poseidon's help. For example, if Percy is in a tough battle against a powerful enemy, he turns to his father. Another is Poseidon coming to Percy to give him a task, like protecting a certain sacred place in the ocean.
Well, they might start comparing their heroic deeds. Percy could talk about his adventures with the Greek gods and monsters in the modern world, like fighting the Minotaur in a New York museum. Theseus would probably share his own tales of slaying the Minotaur in the labyrinth long ago. They could also end up teaming up to face a new threat that emerges in the fanfiction world, perhaps a powerful new monster created by an angry god.
Well, it could be really cool. Percy's water powers and his demigod skills might clash or collaborate with the Avengers' superpowers. For example, he could use his water - controlling abilities to help Thor with his lightning strikes, making them even more powerful. Maybe he and Captain America would bond over their sense of duty and leadership. It would be an epic crossover full of action and adventure.
The story in the fanfiction could start with Percy getting lost and somehow ending up in the world of the Unwanteds. At first, he might be confused and on guard. But as he starts to understand the Unwanteds and their situation, he decides to help. He could use his ability to communicate with sea creatures to get information or assistance. The Unwanteds could be amazed by Percy's powers and his connection to the gods. They might ask him to train them in combat or survival skills. And in return, the Unwanteds could share their unique magical arts with Percy, which could give him an edge in future battles in his own world.
In a fanfiction where Percy Jackson meets Chaos, Chaos might see Percy as a key figure in a much larger plan. Percy, being a demigod with a strong sense of justice and a history of saving the world, could be chosen by Chaos to bring balance to a part of the universe that's on the verge of chaos (in a more general sense). This could lead to Percy having to team up with strange and powerful allies, and facing enemies that he never even knew existed. It would be a wild ride for him, full of new challenges and self - discovery.