The characters would likely start off being cautious of each other. For example, the Ninja from Ninjago, who are used to their own ways of fighting and protecting their world, might be a bit wary of the Monkie Kid and his friends with their different powers. But as they face challenges together, like fighting a common enemy, they would start to respect each other's skills. The more talkative characters from both sides would probably be the ones to break the ice and start sharing stories about their respective worlds.
One possible plot could be that the Monkie Kid characters accidentally end up in the Ninjago realm. They meet the Ninja and at first there are misunderstandings as they don't know each other's powers and motives. But then they realize they have a common enemy, like an ancient evil that threatens both their worlds. So they team up, with the Monkie Kid using his magic staff and the Ninja using their elemental powers to fight this great evil.
The characters would likely have a mix of admiration and friendly rivalry. For example, the cool and collected protagonist of Persona 5 might be intrigued by the more laid - back nature of the Persona 4 protagonist. Meanwhile, the Persona 3 protagonist, with his more somber and serious demeanor, could initially seem a bit intimidating to the others. But as they get to know each other, they would start to bond over their shared experiences of fighting Shadows and protecting their worlds.
The 1987 Turtles would probably be very curious about the more serious and intense 2003 Turtles. They might crack jokes at first to ease the tension, while the 2003 Turtles could be a bit annoyed by their silliness. But as they face challenges together, they'd start to respect each other. For example, when fighting Foot Soldiers, the 1987 Turtles' acrobatic and fun - loving fighting style could complement the 2003 Turtles' more strategic and brutal combat.
It could be Zane from Ninjago and Trixie from Slugterra. Zane is very logical and has a lot of knowledge about technology and combat strategies. Trixie is smart and resourceful in the world of Slugterra. They might cross paths while investigating some strange occurrences that seem to be related to the crossover. Their initial meeting would probably involve a lot of questions and mutual curiosity as they try to figure out where the other is from and what they are doing in this new, combined situation.
First, choose the other franchise or concept you want to cross over with. Then, think about how the characters from both will interact. For example, if it's a crossover with a superhero universe, consider how Monkie Kid's powers compare to the superheroes' and how they'd work together or against each other.
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.
The Naruto characters are used to a world of ninjastic and chakra - based powers. When they meet the Claymore characters, who have a different set of powers based on their yoma - human nature, there would be initial confusion. For example, Naruto might be very curious about the Claymore swords and how they are used. The Claymore characters, like Clare, would be cautious about Naruto's exuberant personality and his powerful chakra. But eventually, they could learn from each other. Naruto could teach them about teamwork in a different way than they are used to in the Claymore world, and the Claymores could show Naruto how to be more stealthy and precise like they are when hunting yoma.
Sasuke from Naruto might initially be distrustful of Lucifer. He's used to dealing with his own world's threats and Lucifer's devilish appearance and powers would make him cautious. But if they find a common goal, like protecting someone or something, Sasuke could grudgingly work with him. Naruto, on the other hand, would be more open - minded and try to befriend Lucifer right away.
Sakura from Naruto and Masane from Witchblade could have an interesting interaction. Sakura, being a strong - willed and skilled medical ninja, might be intrigued by Masane's connection to the Witchblade. She could try to study it from a medical perspective. And Masane could teach Sakura some new combat moves that are more brutal and less refined than the ninja techniques Sakura is used to.
Well, Naruto, being the friendly and curious character he is, would probably be very interested in the Gargoyles. He'd likely approach them with excitement and ask a million questions. The Gargoyles, on the other hand, might be a bit more reserved at first. But once they see Naruto's good intentions, they'd start to open up. For example, Naruto might be fascinated by the Gargoyles' ability to turn to stone during the day and would want to learn if there's any chakra involved in that.