Yang and Iron Man could have a friendly rivalry. Yang is all about brute strength and her fiery personality, while Iron Man relies on his technology. They could compete in a series of challenges, like a strength test for Yang and a tech - based obstacle course for Iron Man. And in the end, they realize they can learn from each other and become better allies in the fight against the bad guys.
Weiss and Iron Man could have an interesting dynamic. Weiss is from a wealthy family in RWBY, and Iron Man is a billionaire. They could bond over their knowledge of high - society and use their resources to fund new projects together. Maybe they create a new type of Dust - powered armor for the RWBY characters.
The RWBY characters could interact with Slender Man in various ways. For example, Ruby might be the first to sense something is wrong due to her keen senses. She could try to attack him directly but find that her attacks seem to pass through him. Weiss could use her glyphs to try and contain or at least slow him down. Blake might be more cautious, observing his behavior from a distance to figure out his motives. Yang, on the other hand, would probably charge in head - first, only to realize that brute force doesn't work against him.
Well, Iron Man would probably be really intrigued by the Gems' abilities. He might try to study them scientifically. Steven, on the other hand, would be in awe of Iron Man's high - tech suit. He'd likely ask a million questions about how it works. And Iron Man might be a bit impatient with Steven's naivete at first, but then grow to like his positive attitude.
Well, Yang could use her Ember Celica to blast away at Terminators. Her powerful punches combined with the shotgun blasts might be able to damage their metal exoskeletons. Weiss could use her Glyphs to try and immobilize the Terminators, creating barriers or traps to slow them down. Blake could use her shadow clones to confuse the Terminators and then strike from unexpected angles.
Ruby could use her speed to quickly move through the settings described in the fanfiction, like the spooky hallways of Freddy Fazbear's Pizza. Weiss might use her glyphs to deal with any threats from the animatronics if they were to come to life in the context of the fanfiction world. Blake could use her stealth to avoid the animatronics and explore the mysteries. Yang could use her strength to fight off any mechanical foes.
The RWBY characters could interact in multiple ways. Ruby would be the one to inspire hope in the Doom - like situations in the fanfiction. Weiss would use her strategic thinking to deal with the challenges. Blake, with her ability to adapt, would find ways to survive. Yang, being the powerhouse, would directly engage with the threats, much like she does in her own world against Grimm. They would all bring their unique Remnant - based skills and personalities to interact with the Doom concepts.
Well, if Spider - Man met Ruby, he'd probably be intrigued by her enthusiasm and her weapon, Crescent Rose. Ruby, in turn, would be in awe of Spider - Man's powers. They might start off a bit cautious around each other, but once they realize they're both fighting for good, they'd become friends quickly. Spider - Man could teach Ruby some new acrobatic moves, and Ruby could show Spider - Man how to better use his environment in combat like she does in the RWBY world.
The interaction would be really interesting. Spider - Man, being from a different world, would bring a new perspective to the RWBY characters. For instance, he could teach them about his concept of 'with great power comes great responsibility'. Weiss might be a bit snobbish at first towards Spider - Man, but as she sees his heroics, she would come to respect him. And Spider - Man would have to adapt to the different social hierarchies in the RWBY world. He might find the Faunus situation quite different from what he's used to in his own world and try to help promote equality in Remnant.
Well, Batman and Iron Man would probably have an interesting dynamic. They are both brilliant strategists and inventors. They might start off sizing each other up, comparing their gadgets and skills. Superman, on the other hand, would be a bit wary of Iron Man at first. He's used to being the most powerful one around, and Iron Man's brash personality and high - tech suit might seem a bit of a threat or at least something he needs to keep an eye on.
They would probably be the leader or the brains in a group. Other characters would look up to them for solutions to problems.
A simple way could be through a dimensional rift. A character from RWBY accidentally stumbles into the Worm universe or vice versa. Then they have to figure out how to get back while dealing with each other's worlds' problems.