One possibility is that the relationships between the characters are altered. Weiss might find that in this parallel universe, she has a closer bond with someone she was not as close to in her own universe, like Blake. They would have to adapt to these new relationship dynamics while also trying to figure out how to get back to their own universe if that's their goal.
Weiss's Glyphs might work in a completely different way. For instance, instead of using them mainly for ice and summoning, they could be more focused on other elements like fire or electricity in the parallel universe. This would force her to relearn how to use her powers effectively.
A prevalent theme is also the re - imagining of the power structure. In an evil parallel universe, the Dust and semblance powers might be used for evil purposes. For instance, Ruby's speed semblance could be used to quickly carry out heinous acts. Also, the theme of a corrupted Beacon Academy often comes up, where it becomes a breeding ground for evil instead of a place to train heroes.
One idea could be that in the parallel universe, the characters have different semblances. For example, Ruby could have a semblance that allows her to manipulate time instead of speed. Another idea is that the kingdoms have different relationships. Maybe Atlas and Vale are bitter enemies instead of allies. Also, the Grimm could be more intelligent and have the ability to form complex societies.
Sure. One popular 'rwby evil parallel universe fanfic' might be 'Dark Reflections'. It twists the characters' personalities in really unexpected ways. The heroes we know become anti - heroes or even villains, which is quite fascinating.
In the 'evil rwby parallel universe fanfic', it could be that there is no Beacon Academy as we know it. Instead, there is a place where they train people to be evil enforcers. The relationships between the characters are also twisted. For example, Weiss might be in a power struggle with Ruby, constantly trying to undermine her to gain more control within their evil group. The world itself could be a darker version, with different kingdoms that are all in a state of constant war and strife.
The characters could also have different relationships with the Grimm. Instead of fighting them, they could be using the Grimm as tools. They might have some sort of ability to control or communicate with the Grimm. Their backstories would need to be adjusted accordingly. For example, Ruby might have had a traumatic experience that led her to turn evil, like losing someone she loved and blaming the world for it, which then made her decide to take over and reshape it in a more cruel way.
Coco Adel could be a really interesting character to focus on in a RWBY Parallel Universe fanfic. Imagine if her love for fashion was not just a hobby but a crucial part of her combat strategy. In the parallel universe, she could design battle outfits that have special abilities. Also, Yatsuhashi Daichi could have a more prominent role. His semblance could be more refined, allowing him to create much larger and more complex barriers that play a vital role in protecting a new, important location in the parallel RWBY world.
In this fanfic, they might encounter alternate versions of themselves. For example, Harry could meet a version of himself who is a dark wizard instead of a hero. Teddy, with his shape - shifting ability, could have a hard time adjusting to the new universe where the rules of magic might be different. They may also find new magical creatures that don't exist in their original universe and have to figure out how to interact with them.
He might find himself in a world with different versions of his friends and enemies. For example, Sasuke could be a peaceful farmer instead of a vengeful ninja. Naruto would probably be confused at first but then use his skills and positive attitude to adapt and try to make things better in that new universe.
He might encounter different versions of his friends and enemies. For example, Sasuke could be a completely different person, perhaps a peaceful scholar instead of a vengeful ninja. Naruto would be confused at first but then adapt to this new world and try to find a way back to his own universe while also making new friends and facing new challenges in this parallel one.