Qrow Branwen is another possibility. He's experienced and has seen a lot in his travels. He might be the first to recognize that Godzilla is not just a mindless monster. He could try to use his knowledge of the world and his connections to get the RWBY team to work with Godzilla rather than against it, seeing the potential benefits of having such a powerful ally.
Blake could also be a key character in this crossover. Her stealth and intelligence could come in handy. She might be the one to study Godzilla's movements and habits from the shadows, trying to find a way to either avoid it if it's a threat or work with it if it turns out to be an ally. She could also use her cat - like abilities to get closer to Godzilla without being detected easily.
Yang would be a likely character. She's bold and not one to back down from a challenge. She might see Godzilla as a huge opponent to test her strength against. Maybe she'd start off trying to punch it, only to realize that brute force alone won't work and then have to figure out a more strategic way to interact with it.
The Pokemon characters would likely be in awe or fear of Godzilla at first. Smaller Pokemon might hide behind their trainers or larger Pokemon companions. Trainers, being the more inquisitive ones, would try to assess Godzilla's intentions. Some brave trainers might approach Godzilla with caution, trying to communicate using their Pokemon's abilities like telepathy or by using signs. Godzilla, on the other hand, might not understand the Pokemon world's rules and customs at first and could accidentally cause destruction while just moving around.
Ruby would be a likely candidate. She is the leader of Team RWBY and has an open - minded nature. She would be able to see beyond Godzilla's initial appearance as a threat and might try to communicate with it. Yang, with her fearless attitude, could also be part of the alliance. She is not afraid to face powerful opponents and would be willing to fight alongside Godzilla if it means protecting the world. Blake, given her experience with different species and her ability to empathize, could also be part of the group that tries to form an alliance with Godzilla.
Naruto would probably be very curious about Godzilla. He might try to talk to it, even though Godzilla can't really communicate in the same way. He'd likely use his friendly and fearless attitude to approach Godzilla. Godzilla, on the other hand, might just see Naruto as a small, insignificant being at first. But as Naruto shows his determination and power, Godzilla might start to respect him in a way.
One idea could be that Godzilla arrives in the RWBY world due to a strange dimensional rift. The Huntsmen and Huntresses initially see it as a huge threat and try to fight it. But then they discover that Godzilla is actually there to fight a common enemy, like a new type of Grimm that is immune to normal attacks but vulnerable to Godzilla's atomic breath.
Natsu would be a likely candidate. He's always up for a challenge and not afraid to take on powerful opponents. He'd probably be the first to rush towards Godzilla, either to fight it or try to befriend it in his own Natsu - like way.
Ruby would probably be both scared and fascinated. She's always been curious about new things, and Godzilla is definitely something new. But she would also be worried about the destruction it could cause. Weiss might be more cautious and initially see Godzilla as a threat to the order in Remnant. Blake would likely be on guard, observing Godzilla's behavior to see if it's truly hostile or not.
Eren could be really interesting. Given his ability to transform into a Titan, he might be curious about Godzilla and try to understand his power. He could also see Godzilla as a rival in terms of power and might try to prove himself by interacting with Godzilla in some way.
Definitely Todoroki. His ice and fire powers could be used in different ways against Godzilla. He could try to freeze parts of Godzilla to immobilize it or use his fire to counter any heat - based attacks Godzilla might have. Also, Recovery Girl could be involved in an interesting way. After any battles with Godzilla, she would be needed to heal the injured heroes, and she might also come up with some unique medical strategies based on Godzilla's physiology if she could study it.
One interesting 'godzilla and rwby fanfic' could be 'Godzilla in Remnant'. In this fanfic, Godzilla somehow ends up in the world of RWBY. It creates a really unique dynamic as the characters from RWBY have to deal with this giant, otherworldly creature. The story plays with the idea of how RWBY's combat skills and semblances would fare against Godzilla's might.
One main theme is the clash of different powers. Godzilla has his atomic - based powers which are so different from the semblances and combat skills in RWBY. So, the fanfic often explores how these different power systems interact.