Sure. One great Twilight alternate universe fanfiction is 'Life and Death' by Stephenie Meyer herself. It's an interesting take where the genders of the main characters are swapped. Another one could be those on FanFiction.net that explore different relationships and storylines for the Twilight characters outside of the original plot.
Some Twilight alternate universe fanfiction delves into time - travel concepts. For example, there are stories where Bella travels back in time and has to deal with the consequences of changing the past. This not only changes her relationship with Edward but also the entire vampire - werewolf - human dynamic in Forks. These types of fanfictions are really creative and offer a lot of new and exciting plotlines.
Well, a very common theme is power dynamics. In the alternate universes, the power balance between the vampires, werewolves, and humans can be completely different. For instance, there could be a world where humans have developed a way to control vampires. Another theme that often shows up is the exploration of different timelines. This can lead to different outcomes for the characters. It might be that Bella never moves to Forks in one timeline, which then changes everything we know about the story. There are also fanfictions that focus on the moral aspects of being a vampire or werewolf in a new and different context.
In an alternate universe, their relationship could start as a friendship based on mutual respect. Felix might admire Bella's courage in the face of danger, and Bella could be intrigued by Felix's strength and loyalty to the Volturi. This friendship could gradually turn into a deeper emotional connection as they face various challenges together.
In some twilight alternate ending fanfiction, Jacob might end up with Bella. This could happen if Edward decides to leave for good, perhaps to protect Bella from the vampire world in a different way. Jacob, being the ever - present protector, steps in and Bella realizes she has deeper feelings for him.
Some fanfictions in the Avengers alternate universe explore the idea of the Avengers being part of a post - apocalyptic world. In this setting, they might have to fight against new and more dangerous threats that emerged from the ruins. Maybe there are mutated creatures or a new breed of supervillains. Also, an alternate universe could feature a younger version of the Avengers, like teen versions, and their journey of growing into heroes while dealing with the typical teenage problems along with the super - hero stuff.
One interesting concept could be if the characters had different careers. For example, instead of being in a glee club, they could be professional dancers in a big city dance troupe. Another concept might be a world where the glee club is a secret society with special powers related to music.
In RWBY alternate universe fanfiction, a cool idea is that the characters switch roles. Yang could be the shy, bookish type while Weiss is the brash, party - loving one. Also, the Dust element could be completely different. Instead of being a resource mined from the earth, it could be something that is created through magic. Additionally, an interesting concept is an AU where the characters are in a modern, non - combat setting, like a high school drama where they still have their unique personalities but deal with normal teenage problems.
One idea could be an alternate universe where Sam and Dean are vampires instead of hunters. They'd have to deal with the moral implications of feeding while still trying to protect humans from other supernatural threats. Another could be a world where the angels won the apocalypse and rule over humanity with an iron fist, and Sam and Dean are part of a resistance movement. Or perhaps an AU where the supernatural world is known to the public, and Sam and Dean are like famous superheroes in that world.
One interesting concept could be a Naruto AU where the ninja world is a modern, high - tech society. Instead of using traditional ninja tools, they use advanced weapons and gadgets. Another could be an AU where the main characters have different elemental affinities than in the original story, which would change their combat styles and relationships.
Well, you could have a Pokemon alternate universe fanfiction where the types of Pokemon are completely different. For example, instead of Fire, Water, and Grass, there could be types like Light, Dark, and Spirit. The story could revolve around a trainer who discovers this new type system and has to learn all over again how to battle and catch Pokemon. It could also be an AU where all Pokemon are sentient and can talk freely, which would change the whole dynamic of the Pokemon - trainer relationship.
One interesting plotline could be where the Starks never lose their power in the North. Instead of Ned Stark's execution, he manages to outwit his enemies and unites the North even more firmly against the Lannisters. This would change the entire power dynamic in Westeros as the North would be a much stronger force from the start.