Yang could also be a top contender. Her strength and fighting spirit in RWBY would make her a formidable Pokemon trainer. She would be fearless in battles, and her ability to take hits and keep fighting could inspire her Pokemon to do the same.
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.
Ruby would be really interesting. Her speed and enthusiasm would make her stand out in the For Honor battles. She'd be eager to learn all the new combat moves and would probably be the first to charge into a fight, her scythe whirling in the For Honor arenas.
I think Yang would be great. Her fiery personality and powerful punches would be a force to be reckoned with in the Battlefield setting. She could be the one charging into enemy lines, taking out multiple foes at once, and really showing off her combat skills in this new and different kind of battlefield.
I think Yang would be the most interesting. Her hot - headed and powerful personality would fit well in the Doom setting. She'd be charging into battles with the demons, using her Ember Celica to blast them away. And her ability to get stronger when she's angry could be a great asset in the high - intensity combat of Doom.
I think Weiss could be the most interesting. Her strict upbringing and refined combat style from RWBY would contrast greatly with the rough - and - tumble nature of the Halo universe. She might struggle at first to adapt but then use her intelligence and Glyph - based powers to come up with some really cool strategies against the Halo enemies.
Ruby would be a likely candidate. She is the leader of the RWBY team in their own universe, and she has a natural ability to inspire others. Her quick thinking and combat skills would also be valuable in the Battlefield 1 setting. She could quickly assess the situation on the battlefield and make decisions on where to move the team and what objectives to pursue.
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.