The technology from the Transformers universe would likely have a huge impact on Remnant. The RWBY characters would be amazed by the Autobots' ability to transform and their powerful weapons. The Autobots, in turn, might be intrigued by the concept of Aura and Semblances.
There could be a cultural exchange as well. The Autobots and Decepticons have their own complex cultures and hierarchies. The RWBY characters could learn from their sense of loyalty and honor (in the case of the Autobots) or their cunning and resourcefulness (in the case of the Decepticons). At the same time, the Transformers could be influenced by the RWBY characters' strong bonds of friendship and their determination to protect their world.
The crossover fanfiction could also change the power dynamics. With Iron Man's intelligence and resources added to the Transformers' side, they could become a more formidable force against the Decepticons. And in the Marvel universe, the existence of the Transformers could shift the balance of power among the superheroes, as they would have to deal with these new, powerful entities.
Megatron, if he were to interact with Bumblebee in a crossover, it would be full of conflict. Megatron might underestimate Bumblebee at first but then be surprised by his tenacity. He could try to manipulate Bumblebee into turning against the Autobots, using his charm and power to sway him, but Bumblebee would resist.
The logical Spock from Star Trek might be fascinated by the Transformers' mechanical nature and try to analyze them. Captain Kirk, on the other hand, would likely be more bold and adventurous in his interactions, perhaps even challenging the Autobots or Decepticons. Optimus Prime would probably see the Star Trek crew as potential allies in the fight for peace and justice, and he would approach them with respect. Megatron, of course, would see them as either threats or potential tools for his own evil plans.
The characters from Fast and Furious would likely be in awe of the Transformers at first. Dom, for example, would probably be initially hesitant but quickly see the potential of teaming up with them. He might try to learn some of their combat moves to use in his own fighting style. Meanwhile, the Autobots like Optimus Prime would be respectful of the humans' skills and courage. Bumblebee could form a special bond with one of the younger members of the Fast and Furious crew, perhaps sharing his love for speed in a unique way.
The Sailor Guardians would likely be initially cautious around the Transformers. Sailor Venus might be the first to approach them, being the more outgoing one. She could try to communicate and find out their intentions. Optimus Prime, on the other hand, would probably be very diplomatic, trying to assure the Sailor Scouts that they mean no harm. The more impulsive Sailor Scouts like Sailor Jupiter might be a bit quicker to jump into action if she feels threatened, while the Autobots like Ratchet would be there to try and defuse the situation.
The Jaeger pilots would likely be in awe of the Transformers at first. They're used to big machines, but the Transformers are something else entirely. The Autobots would probably be friendly and helpful, trying to work with the humans. Optimus Prime could act as a sort of mentor to the pilots, teaching them about honor and sacrifice. The Decepticons, on the other hand, would see the Jaegers as a threat or something to be used for their own gain.
Ruby would probably be very excited to meet Geralt. She might ask him a million questions about his adventures and his weapons. Geralt, on the other hand, would be more reserved but would respect Ruby's enthusiasm. Blake might be a bit cautious around the Witcher at first, but would soon be interested in his knowledge of different creatures. Yang would be eager to spar with Geralt to test her strength. And Weiss would be curious about the Witcher's magic and how it compares to her own Glyphs.
The characters would likely have an initial period of confusion. The Warframe Tenno, being used to their own high - tech battles, might be startled by the more 'primitive' but still effective weapons of RWBY. Meanwhile, the RWBY characters could be in awe of the Warframes' advanced abilities. For example, when a Warframe uses teleportation, the RWBY team would be both amazed and a bit suspicious. Eventually, they would start to work together, with the Warframes teaching the RWBY characters about advanced combat tactics and the RWBY characters showing the Warframes the ins and outs of their world.
For the Ghost Rider universe, it could introduce advanced technology. Imagine Ghost Rider using a Transformer's weapon against his demonic foes. It would change the power dynamics in his battles.
In a crossover, the RWBY characters would have to adapt to Doflamingo's powers. Yang's hot - tempered nature might lead her to engage in a direct fight with Doflamingo, which could be both dangerous and exciting. Weiss would use her intelligence and her family's resources to try to find a weakness in Doflamingo. Ruby, with her innocent yet determined personality, would try to find a way to redeem Doflamingo if possible, but if not, she'd be fully committed to taking him down.