Well, in many Percy Jackson alternate universe fanfic, Leo Valdez is quite popular. People love to write about his inventions in different scenarios. Maybe he creates a super - powerful weapon that changes the balance of power between the demigods and the monsters. Grover also has his fans in these fics. He could be in a universe where he's the most powerful satyr ever and has to use his nature - related powers to save the world. And of course, Clarisse La Rue can be really interesting in alternate universes, like a Clarisse who teams up with her former enemies to fight a greater threat.
One of the most popular characters in Percy Jackson alternate universe fanfic is Thalia Grace. Her status as a powerful half - blood, and her connection to the Hunters of Artemis, gives a lot of room for creative storytelling. In some alternate universes, she might be the one to discover a new type of magic or a new realm. Jason Grace is also popular. He could be in a world where he has to choose between his Roman heritage and a new, unknown power source. And let's not forget about Piper McLean. In alternate fics, she could use her charm - speak in completely different and unexpected ways, like charming inanimate objects to do her bidding.
In alternate universe Percy Jackson fanfiction, Percy is obviously a top character. People love to put him in various situations, like a world where he's a pirate. But Annabeth is right up there too. Her relationship with Percy and her own skills make her a key figure. Grover also has his fans. In an alternate universe where he has more magical abilities or is a different kind of nature spirit, he can be really interesting. And then there's Luke. Even in alternate universes, his complex character and his fall from grace are often explored, making him a popular character to include.
In Percy Jackson parallel universe fanfiction, Thalia Grace is quite popular. Her being a daughter of Zeus and her tough - as - nails attitude make her a great character to explore in different universes. Leo Valdez is also well - liked. His mechanical skills and sense of humor can be a great addition to any parallel universe story. Additionally, Clarisse La Rue has her own fan following. Her brash and bold personality can be made even more interesting when placed in a parallel universe setting.
Jason Grace is a character that features a lot in fanfiction. His leadership skills and his connection to the Roman side of the demigod world are interesting aspects to write about. Fanfiction writers may explore his relationship with Percy, especially how they combine their different leadership styles when facing challenges together, and his struggle to adapt to the Greek demigod world after being brought to Camp Half - Blood.
Rey is often a popular character in Star Wars alternate universe fanfic. Writers like to explore different paths for her, such as her training under different Jedi masters or her relationship with other characters in new ways. Kylo Ren is also popular. Fanfic authors might write about his redemption in more complex scenarios than in the official story. And of course, Darth Vader. There are always fanfics that imagine what would have happened if he had survived and changed his ways, or if he had different relationships with other Sith or Jedi in the alternate universe.
Naruto himself is often reimagined. Writers like to explore different versions of him, such as a Naruto with a darker personality. Sasuke is also popular. In some AUs, he could be a more carefree character. And Kakashi is another one. Maybe a Kakashi who didn't have to endure so much trauma at a young age.
Scully is also highly popular. Her scientific mind and her relationship with Mulder, whether it's changed or intensified in the alternate universe, are always interesting aspects for fans to write about. Sometimes she might be even more of a skeptic or more open - minded depending on the fanfic's concept.
Hayato Gokudera is quite popular. In an alternate universe, he might be a lone samurai in a feudal Japan - like setting, or a tech - genius hacker in a cyberpunk world. Then there's Yamamoto. He could be a star athlete in a world where sports are the main focus instead of Mafia activities. His natural athleticism and positive attitude would make him a great character to develop in such a setting. Also, Hibari is often chosen. He could be the strict headmaster of a strict academy in an alternate educational - themed universe.
Severus Snape is a fan favorite in alternate universe stories. People are interested in seeing his character developed further, perhaps in a world where he didn't have such a complex relationship with Lily Potter. Harry Potter himself is, of course, a popular choice. Fanfic writers might create scenarios where Harry discovers his magic much earlier or has different adventures outside of Hogwarts that change his character development.
Nico di Angelo is another popular character in these fanfics. His control over the dead and shadow - traveling abilities offer a lot of room for creativity. Fanfic writers often give him new powers or expand on his existing ones, like making his control over the dead more powerful or adding new elements to his shadow - traveling. His brooding and mysterious nature also makes him an interesting character to write about in the context of powers.
Obviously Percy himself is very popular. Since it's a 'Percy Jackson Reacts' scenario, he's at the center of it all. Fans love to write about his reactions.