Blake's ability to create clones might have some new twists. In the parallel universe, her clones could have different abilities or limitations. They might be more tangible or have the ability to communicate with her in a new way. And Yang's strength could be measured differently. There could be new power - up mechanisms or restrictions that she has to deal with in this new world.
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.
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.
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.
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.
Sasuke's Sharingan would be a very powerful ability in the RWBY world. He could use it to predict the movements of Grimm or enemies in combat, much like how it works in the Naruto universe. His fire - based jutsu like Fireball Jutsu could be a unique form of attack against the Grimm.
Hulk's powers would likely be affected by the ki energy in the Dragon Ball Z universe. His gamma - based strength might be enhanced by ki, making him even stronger. Also, his ability to heal and regenerate could potentially be influenced by senzu beans or the natural healing properties of ki.
His invisibility power would be extremely useful for stealth missions in RWBY. He could easily sneak up on Grimm or gather intelligence without being detected.
Atreus's power of Norse magic and his proficiency with the bow could work in interesting ways with Percy's powers. Imagine a scene where they are facing a powerful enemy. Atreus uses his magic to create illusions to distract the foe, while Percy uses his water - based powers to create a smokescreen. Then, Atreus shoots his arrows through the smokescreen, guided by Percy's ability to sense the enemy's location through the water vapor. Their powers could also clash at times. For instance, if Percy accidentally creates a flood in an area where Atreus is trying to use his earth - based Norse magic, they would have to quickly figure out how to balance their powers.
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 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.