I think it's hard to say for sure. The RWBY kingdoms have the advantage of having a diverse range of combatants with different semblances. But America has things like nuclear weapons. If they were allowed to use them in this fictional battle, it could completely change the outcome. However, using such extreme weapons might also go against the rules of the fanfiction, so it's really up in the air.
The RWBY kingdoms. In the RWBY universe, they are used to dealing with various threats like Grimm. Their Huntsmen and Huntresses are highly trained warriors with superhuman abilities. America, while having a strong military, may not be prepared for the kinds of powers and tactics that the RWBY kingdoms use. Also, the kingdoms have Dust, which can be used in various ways for combat and other purposes.
One potential storyline could be a misunderstanding that leads to the conflict. Maybe America discovers the RWBY kingdoms and misinterprets their actions as a threat. Another could be a search for resources. If the RWBY kingdoms need something that only America has, or vice versa, it could start a battle. There could also be a storyline where a common enemy forces them to work together despite their initial differences.
It's really tough to say. Star Wars has the Force which gives characters some really powerful abilities like telekinesis and mind control. But RWBY characters have their Aura and Semblance which can also be very strong. However, if I had to choose, I'd say Star Wars characters might have an advantage just because the Force is such a game - changer. But it really depends on the specific characters chosen and how the fanfiction is written.
Ruby could definitely be a main character. She has a curious nature and would be very interested in exploring the new American - influenced elements in Remnant. Weiss might also be a main character as she comes from a wealthy and influential family, and she could play a role in how the new American - like concepts are received in the upper echelons of society. Blake could be involved as well, perhaps using her knowledge and experience to analyze how these new ideas might impact the Faunus community. And of course, Yang, with her bold and fearless personality, would be right in the middle of any action or change related to the American influence in Remnant.
He could be a mentor figure. Captain America has a wealth of combat experience and strong moral values. He could train the RWBY characters, especially in hand - to - hand combat and strategy. His presence would add a new dynamic to the Beacon Academy training sessions.
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.
Perhaps in the fanfic, Captain America's shield could be modified with Dust technology in the RWBY world. He might also have to adjust to the different fighting styles and powers of the RWBY characters. For example, learning about Aura and Semblances and how they can be used in combination with his own abilities in combat.
Toad and Blake could form an alliance. Toad is small but mighty, and Blake is stealthy. They could work together in reconnaissance missions. Toad could use his speed to quickly gather information, and Blake could use her cat - like senses and stealth to move around undetected and protect Toad if they are discovered.
Captain America might seem to have the upper hand in terms of raw physical power. However, Batman is known for his ability to analyze his opponents and find their weaknesses. He could potentially use his intellect to outmaneuver Captain America. On the other hand, Captain America's combat experience and unwavering determination can't be underestimated. So, it's a toss - up.
Ruby is often a popular choice. Her energetic and positive nature can bring a lot of life to a fanfiction. Plus, her scythe - wielding skills can be interestingly incorporated when dealing with gas - related battles or exploration scenarios.
Ruby and Church could form an alliance. Ruby is always eager to make new friends and fight for what's right. Church, despite his snarky attitude, has a good heart deep down. They could bond over their leadership roles in their respective teams and share their knowledge about combat and strategy.