There might be a Xander - centered crossover fanfiction where he enters the 'Harry Potter' world. He could bring his knowledge of fighting the supernatural from his own world to Hogwarts. Maybe he'd help the students there deal with some dark magic threats that the teachers are having a hard time handling. This type of crossover can create really interesting storylines as Xander's different perspective and skills add a new dynamic to the wizarding world.
One popular Xander slash crossover fanfiction might be one that crosses over with 'Buffy the Vampire Slayer' and another supernatural show. It could explore a romantic relationship for Xander in a different, yet related, fictional universe.
You should also do some research on both universes. If you're crossing Xander with the 'Doctor Who' universe, know about the rules of time travel in Doctor Who and how Xander's normal life in his own world would be affected by it. Then, start creating a plot that involves Xander as the central character. Maybe he gets accidentally transported to the Doctor's world and has to find a way back while also helping the Doctor save a planet or something. Build up the story around his experiences, his reactions to the new world, and how he uses his own abilities to get through various challenges.
One popular theme is Hermione's academic achievements and how she uses her knowledge to overcome difficulties. For example, she might use her vast library of spells and potions knowledge to solve a crisis in Hogwarts. Another theme is her friendships, especially her relationship with Harry and Ron. Fanfictions often explore how she supports them and how they support her in return.
One popular Hermione - centered fanfiction is 'Hermione Granger and the Time - Turner of Doom'. It's a great story that focuses on Hermione's intelligence and her ability to solve complex problems within the wizarding world. Another one is 'Hermione's Hogwarts Adventure', which explores her experiences at Hogwarts in a new and exciting way, highlighting her friendships and her growth as a witch.
One popular female Xander fanfiction is 'The Adventures of Female Xander'. It takes Xander on a journey through a magical realm where she discovers new powers. Another one could be 'Female Xander's Quest for Identity', which delves deep into how being female changes Xander's self - perception and relationships.
Some popular Asura crossover fanfictions often involve crossovers with other well - known fantasy or action - adventure universes. For example, an Asura crossover with a popular anime universe like Naruto could be really interesting. The Asura's unique powers and characteristics would interact in unique ways with the ninjas and their jutsus in the Naruto world.
There are also Sylar crossovers with other shows like 'Smallville'. In this type of fanfiction, Sylar might end up in Smallville and have encounters with Clark Kent. His powers would be a contrast to Clark's, and the story could explore how a villain like Sylar would fare in a world with a different kind of hero.
One popular Nasuverse crossover fanfiction might be one that combines characters from 'Fate/stay night' with other well - known anime universes. For example, a crossover with 'Fullmetal Alchemist' could be really interesting. The different magic systems and character personalities would create a lot of unique interactions.
One popular OPM crossover fanfiction could be an OPM and One Piece crossover. In this type of fanfic, characters from OPM might find themselves in the world of One Piece, facing off against pirates and dealing with the mysteries of the Grand Line. Another could be an OPM and Naruto crossover, where Saitama's overpowered abilities contrast with the ninja world's complex jutsu system. There are also OPM and Dragon Ball crossovers, which often explore how Saitama's strength compares to the Saiyans' power levels.
One popular Trunks Crossover Fanfiction is 'Trunks in the DC Universe'. It explores what would happen if Trunks landed in the DC world and interacted with heroes like Superman and Batman. It's really exciting to see how his Saiyan powers would be perceived in that different universe.