In some RWBY fanfiction, Ruby herself might be depicted as an even more powerful warrior. For example, she could have enhanced her silver - eyed warrior abilities to not only freeze Grimm but also control them to some extent. This would make her an extremely formidable force in the fan - created stories, as she already has great combat skills and leadership qualities in the original RWBY series.
Another contender for the most powerful warrior in RWBY fanfiction could be a character based on a fusion of different RWBY team members' abilities. Imagine a character with Weiss's glyphs, Blake's shadow clones, Yang's strength amplification on hits, and Ruby's speed. Such a character would have a very diverse and powerful set of skills, making them a top - tier warrior in the fanfiction world.
One of the popular OC warriors is often a character with a very powerful semblance like the ability to manipulate gravity. This makes them stand out in battles against the Grimm and also in interactions with RWBY characters.
I think Weiss might be the most powerful. Given her intelligence and magical abilities in RWBY, she could easily understand the complex mechanics of Pokemon training and battles. Also, she could potentially use her Glyphs in creative ways to enhance her Pokemon's performance in battles.
It's hard to say for sure, but Ruby Rose has the potential to be very powerful in a crossover. Her silver - eyed warrior powers are still somewhat of a mystery in RWBY, and if combined with the knowledge and abilities from Hellsing, she could become a force to be reckoned with. Also, her leadership skills and the fact that she is constantly growing in power throughout RWBY could give her an edge in a crossover scenario where she has to adapt to new threats like the vampires from Hellsing.
Akuma is extremely powerful in the Street Fighter universe with his dark powers. However, in an 'rwby street fighter fanfiction', Pyrrha Nikos might be able to give him a run for his money. Pyrrha is a skilled fighter with her polarity semblance. She could potentially manipulate Akuma's attacks and turn them back on him. Also, her combat skills are top - notch, which would make her a very powerful character in this crossover.
Another candidate could be Ruby with the Silver Eyes. If her power could be enhanced with DBZ - like Ki training, she might become the most powerful. But then there are also characters like Beerus who could potentially wipe out entire planets in both universes. So it's really a complex comparison.
I think Qrow could be really powerful in a RWBY x Naruto fanfusion. He has his own set of skills and if he were to learn some of the more powerful jutsu from Naruto, like the Rasengan or some of the more advanced sealing techniques. His experience as a Huntsman and his natural combat abilities would be enhanced greatly. And Weiss with her Glyphs and if she were to learn some chakra - based techniques could also be a very powerful combination.
It's hard to say. Naruto has his powerful ninjutsu like the Sage Mode and the Nine - Tails chakra. But Salem has her own dark magic and immortality. If Naruto can figure out a way to counter Salem's immortality, he could be very powerful against her. However, in the RWBY world, characters like Ruby with her silver eyes power also have the potential to be extremely strong. So it really depends on how the story is written.
It could be a character who combines the most powerful magic from Harry Potter, like the Killing Curse, with the strongest semblance in RWBY. For instance, if a character could use the Killing Curse and also had a semblance that allowed them to control time like Ruby's, they would be extremely powerful.
I think Qrow could be really powerful in this crossover. He has his own unique abilities in RWBY, and if he were to also master the Force, especially the more combat - oriented aspects like telekinesis to throw his weapon with more force or use the Force to enhance his reflexes, he'd be a force to be reckoned with. He also has a lot of experience in combat which would help him adapt to the new powers.
I think Naruto Uzumaki combined with Ruby Rose could be extremely powerful. Naruto has his vast chakra reserves and powerful jutsu like the Rasengan. Ruby has her super - speed and the ability to use her scythe, Crescent Rose, with great skill. Together, they could be a force to be reckoned with. Naruto could use his clones to distract enemies while Ruby zooms in for the kill.