Godzilla Earth is not a fanfic. It has its own official production and creative process, distinct from fan-created works. It's a legitimate entry in the Godzilla canon.
Well, they might be really confused at first. The cultures and settings in Earth fanfictions are so different from their own world in RWBY. For example, if the fanfiction involves modern technology like cars or cell phones, which don't exist in their world, they'd be super curious and might have a hard time understanding how these things work. They could also be shocked by different social norms or historical events that are unique to Earth.
They might be really confused at first. Earth music is so different from the music in their world. For example, the beats and rhythms could be completely new to them. They might also be intrigued by the lyrics, especially if they touch on themes that are relevant to their own experiences in RWBY, like friendship and fighting for what's right.
Ruby's bubbly and adventurous personality would make her eager to explore every aspect of the Earth fanfiction. She'd be the first to jump into the new stories and concepts. Weiss, with her more refined and sometimes haughty nature, might initially be dismissive but then become intrigued as she delved deeper. Blake, being the introspective type, would look for deeper meanings and connections in the fanfiction. Yang, with her bold and brash attitude, would be looking for the most exciting and action - packed parts right away.
I recommend Godzilla 2: King of Monsters to you. The plot is about aliens attacking and threatening Earth. At the same time, Godzilla fights with other giant monsters like Mosla, Ratton, and Kidora. In the end, Godzilla helps humans find little Godzilla and defeat the aliens with the other monsters. I hope you like this fairy's recommendation. Muah ~😗
For developing the plot, you could introduce a new, powerful enemy that neither Godzilla Earth nor the existing characters in the crossover world can defeat alone. So, they have to combine their strengths, like Godzilla Earth's raw power and the other characters' strategic thinking. As they fight together, they also face internal conflicts within their newfound alliance. Some may not trust Godzilla Earth completely, and this mistrust can create interesting sub - plots and character development. Eventually, through a series of events and battles, they overcome their differences and defeat the enemy. This could also lead to a changed world view for all the characters involved, and perhaps a new status quo for the fictional world.
One idea could be that Godzilla Earth teams up with a group of humans who have developed advanced technology to fight off an alien invasion. The humans initially fear Godzilla but soon realize they need his power.
Well, the Jedi might be quite intrigued by Earth's diverse cultures. They could be amazed at how different our beliefs and ways of life are compared to the galaxy far, far away.