In the 'Percy goes to another universe fanfiction', there are numerous possibilities. Percy could be transported to a universe where the concept of demigods doesn't exist at all. He would be a complete stranger with his powers. The environment might be so different, like the water could have different properties. He would have to figure out how to get back to his own universe while also dealing with the new challenges and mysteries that this strange universe presents. It could be a journey of self - discovery as he realizes how much his own identity is tied to his home universe.
In this fanfiction, Percy might encounter different versions of his friends. For example, Annabeth could be a powerful sorceress instead of a strategist. He could also face new and strange monsters that are unique to that universe.
In fanfiction, if Percy Jackson goes to the Naruto universe, he'd probably be really confused at first. The chakra system would be so different from his demigod powers. But he could learn about it. And his ability to control water could be seen as a really unique jutsu. He might even be mistaken for a very powerful water - style ninja at first. He could also introduce the idea of Greek gods to the Naruto characters, which would be a really wild concept for them.
He might encounter new and strange creatures. In many fanfictions, Percy could meet unique magical beings that don't exist in his own world. For example, he could come across sentient plants that can communicate or floating islands with their own mini - ecosystems.
He might meet alternate versions of his family members. Maybe a Percy from another universe whose mother is a powerful queen instead of a mortal.
In this fanfiction, Harry might encounter new magical creatures unique to that country. He could learn different kinds of magic that are practiced there. For example, if he goes to a country in Asia in the wizarding world, he may discover spells related to nature spirits which are not common in his homeland.
Well, in the new timeline, Harry could find that Voldemort has already won. This would mean he has to figure out a way to either change the past to prevent this future or find a way to defeat Voldemort in this new, much more difficult situation. It would be a huge challenge for him.
Well, she might face new challenges. In a different school, the curriculum could be completely different. Maybe she'll have to learn new spells or magical theories that are unique to that institution. She could also meet new friends or rivals. There might be a different social hierarchy compared to Hogwarts, and she'll have to find her place in it.
Well, she might get into all sorts of adventures. Maybe she'd team up with the Rebels. Since Arcee is a skilled fighter in her own universe, she could bring some unique combat skills to the Star Wars galaxy. She could help in battles against the Empire, perhaps using her speed and agility to outmaneuver stormtroopers.
In the alternate universe, Harry could meet different versions of his friends and enemies. His relationship with them would be very different. For instance, Hermione might be a Death Eater or Ron could be a powerful dark wizard. It would be a huge shock for Harry to deal with these new identities of people he thought he knew well.
In the 'Percy goes to Hogwarts alone fanfiction', it's possible that Percy will discover new aspects of himself. Since he's alone, he has to rely solely on his own wits and skills. He could stumble upon some hidden secrets of Hogwarts that others haven't found. Also, he may have some unique encounters with the Hogwarts professors who take notice of his solitary situation and offer him special guidance or tasks.
In fanfiction, if Percy Jackson goes to highschool, he might face challenges like hiding his demigod powers from his classmates. He could also encounter new mythical creatures that are drawn to the school environment.