In RWBY Warhammer 40K fanfiction, Weiss Schnee is quite popular. Her ice - based abilities and noble background can create some really unique storylines. For example, she could be part of an Imperial noble house, using her powers to defend it. Blake Belladonna is also a favored crossover character. Her stealth and agility, along with her Faunus heritage, can add a new dimension to the stories in the 40K setting, perhaps as a spy or infiltrator.
One of the most popular crossover characters is Qrow Branwen. His experience and combat skills, as well as his ability to transform into a bird, can bring a lot of intrigue to the Warhammer 40K fanfiction. He could be a lone operative, working in the shadows against the Chaos forces. Also, Pyrrha Nikos has her fans in these crossovers. Her combat prowess and self - sacrificing nature could make her a heroic figure in the often - dark 40K universe, maybe as a martyr in a battle against a powerful daemon.
Ruby Rose is often a popular crossover character. Her combat skills and leadership in RWBY make her a natural fit to be inserted into the Warhammer 40K universe. She could potentially lead a squad of Space Marines or be a key figure in a resistance against some of the darker forces. Another popular one is Yang Xiao Long. Her strength and brawler - like combat style can be really interesting when pitted against the various foes in 40K.