Ruby. She has that innocent and curious nature which would make her reactions in the SAO world really interesting. She could be fascinated by the virtual world and its different rules, and her positive attitude might be a source of hope for the other characters. Also, her scythe - using skills could be adapted in the SAO combat scenarios in unique ways.
I think Kirito from SAO would be really interesting in this context. If he were to enter the RWBY world, his experience in surviving a death - game could give him an edge in dealing with the Grimm. He could also share his sword - fighting skills with the RWBY characters. And seeing how he would interact with the different personalities in RWBY, like the headstrong Yang or the reserved Blake, would be really engaging to write about.
Weiss would be a great character to focus on. Her background in the Schnee family gives her a certain air of sophistication and pride. In the SAO world, she could struggle with the different social hierarchies or perhaps use her family's influence in some virtual - business - like scenarios. In RWBY, she's used to using Dust and her Glyphs in combat. In the SAO world, she could try to find equivalents or new ways to use her skills, and her journey of adaptation would be full of potential for character development.
Sinon from Ggo could also be very interesting. If she were to enter Sao, her sniper skills might translate in unexpected ways. She could be paired with characters from Sao and learn new combat techniques while also teaching them about the precision of long - range attacks.
Mercury from RWBY could be an interesting character to focus on. He has a rather morally ambiguous nature already. In a Darkwatch fanfiction, he could be tempted by the power of the Darkwatch's enemies, like the vampires or demons. His prosthetic legs could also be given some kind of dark upgrade, and we could see him struggle between his own self - interest and the greater good in this new and dangerous setting.
Yang from RWBY would be another interesting choice. Her fiery personality and powerful punches could bring a different kind of energy to the Halo Wars universe. She might get into some interesting battles with the Covenant, using her brute strength and her Semblance of absorbing damage to become even stronger in combat.
Ruby would be really interesting. Her optimism and determination in RWBY could be a great contrast to the often dark and foreboding nature of the Dark Tower universe. She could inspire the characters there with her can - do attitude and also learn a lot from the more cynical or world - weary characters in the Dark Tower world.
Ruby could be really interesting. Her naivete and pure - hearted nature would contrast with the often - cynical and war - torn world of the Clone Wars. She could inspire the clones and Jedi with her unwavering belief in doing good, and her scythe - wielding skills would be a unique addition to the battles.
Ruby would be really interesting. Her energetic and optimistic nature would contrast greatly with the often dark and power - hungry characters in the Overlord world. She could inspire some of the downtrodden minions with her belief in the good of people. Also, her scythe skills and speed would be a unique addition to the battles in the Overlord universe.
One idea could be a crossover of the combat styles. For example, the characters from RWBY could learn some new sword techniques from SAO and incorporate them into their own fighting. Another could be a scenario where the characters are trapped in a virtual world similar to SAO but with the Grimm from RWBY. They would have to fight the Grimm while also dealing with the rules of the virtual world.
I think Blake would also be a great focus. Her stealth and agility would translate well in the Monster Hunter world. Plus, her cat - like Faunus traits could give her an edge in certain situations, like tracking or sneaking up on monsters.
They might be really intrigued. Ruby would probably be excited about the new and different take on the SAO world. Weiss might be a bit critical at first, analyzing the writing style and how it adheres to the original concepts. Blake could be drawn in by the unique interpretations of the characters, while Yang would enjoy the action-packed parts and cheer on the characters during intense scenes.
Well, Ruby might be really excited. She loves new and interesting stories, and the SAO Abridged fanfiction could be full of action that would appeal to her sense of adventure. Weiss might be a bit more critical at first, but she could end up getting into it as she realizes the unique take on the SAO world. Blake would probably be interested in the characters' relationships and how they are portrayed in the fanfiction. Yang would likely enjoy the more intense and exciting parts, cheering on the characters during battles.