Blake would likely be cautious. Given her past experiences, she doesn't trust easily. But she might also be interested in Harry's different perspective. Yang would be more open - minded, ready to welcome him as long as he doesn't pose a threat. The teachers, like Ozpin, would be more calculating. He'd want to figure out how Harry got there and what his intentions are.
He could bring new skills and knowledge. For example, his apparating ability could be useful in combat or for quick escapes in RWBY's dangerous situations. Also, his knowledge of magic could potentially be combined with the Dust - based technology in RWBY. He might start teaching some students about different forms of magic, which could change the way battles are fought at Beacon.
Ruby would probably be very suspicious at first. She knows Roman from his criminal activities and would find it hard to trust him right away. But being the kind - hearted person she is, she might give him a chance to prove himself.
The characters in Beacon Hills would be shocked at first. Scott might be a bit wary but also curious. He would want to know more about Harry's magic. Stiles, on the other hand, would be full of questions and would probably pester Harry to learn all about the wizarding world.
Some might be amused. Naruto characters have their own set of stories and adventures, and seeing the different and often wild ideas in RWBY fanfiction could be a source of entertainment for them.
In 'rwby watches earth fanfiction', Ruby would be wide - eyed and eager to explore every new thing. She'd be constantly asking questions about how things work. Weiss would be shocked by the lack of a Dust - based power system but would soon start to admire Earth's ingenuity. Blake would be drawn to the underground subcultures on Earth, like punk or goth cultures. Yang would be amazed by the variety of fighting styles on Earth, from martial arts to boxing. They all would have to come to terms with the fact that Earth is a very different place from Remnant.
For Harry Potter characters, reading fanfiction could be a strange experience. Ginny might be protective of how she and Harry are portrayed in romantic fanfictions. Neville could be surprised by the confidence some fanfictions give him. In RWBY, Blake might be a bit hesitant at first but then get into the more thought - provoking fanfictions. Pyrrha, if she were still alive, would likely be flattered by the positive portrayals in fanfiction. It would open up a whole new world of how they are perceived by their fans for all of these characters.
Some RWBY characters might be in awe. Ruby, with her love for all things cool and powerful, would probably be very excited to meet Harry and learn about his magic. Weiss, on the other hand, might be a bit more reserved and initially skeptical. Blake could be curious about where he came from and what his world is like. Yang might see him as a potential ally in fights against Grimm and be eager to test his strength.
They might be confused at first. RWBY has its own unique lore and concepts that are different from many anime. So anime characters may need time to understand things like Grimm and Huntsmen. For example, if Goku from Dragon Ball was watching, he'd probably be like 'What are these strange monsters?'.
Ruby would be all wide - eyed and full of enthusiasm. She'd be like a kid in a candy store, eager to share any cool ideas she found in the fanfiction with her team. For example, if there was a super - cool ninja weapon in the story, she'd start thinking about how Crescent Rose could be modified to have some of those features.
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.