Well, Peter Parker might be really curious about Ladybug's powers. He'd probably ask her a lot of questions about how her Miraculous works. Ladybug, on the other hand, would be interested in Spider - Man's scientific gadgets. They could exchange knowledge and techniques.
The characters could have some cultural exchanges too. Peter, being from New York, could introduce Ladybug to the fast - paced city life there. Ladybug could show Peter the charm and beauty of Paris. In terms of fighting crime, they might initially have some clashes in their approaches. Spider - Man is more used to solo fighting and using his own strength and gadgets, while Ladybug is used to working with her partner, Cat Noir. But over time, they would learn to work together effectively.
Imagine Spider - Man trying to teach Ladybug some of his acrobatic moves. He could show her how to swing between buildings in a more efficient way. Ladybug could then teach Spider - Man how to use her yo - yo more effectively in combat. Their personalities are also different. Peter is often more brooding and self - reflective, while Ladybug is more positive and determined. This difference in personalities could lead to some interesting character development as they interact.
Spiderman would likely be initially cautious when meeting Ladybug. He's used to operating on his own in New York, and suddenly meeting a hero from Paris with a very different power set would be a bit of a shock. He might be impressed by her ability to create objects with her yo - yo and use them in combat.
In fanfiction, the Miraculous Ladybug characters could interact with the UN in multiple ways. First, they could be invited to give a presentation on the nature of akumas and how they've been combating them. Then, they might be part of a task force created by the UN to deal with a global akuma - like threat. Ladybug would use her leadership skills, while Chat Noir would bring his charm and combat skills. They would also interact with UN staff, learning about international laws and regulations regarding superhero activities. And perhaps they would even help in training other heroes from around the world who are brought together by the UN.
Ladybug might be in awe of Captain America's leadership and sense of justice. She could learn a lot from him about leading a team. Meanwhile, Cat Noir would probably be intrigued by Iron Man's high - tech gadgets and try to get his hands on some. He might even joke around with Thor, comparing their 'cat - like' reflexes.
Anna, being outgoing and adventurous, would probably get along great with Chat Noir. They could have a lot of fun banter and adventures together. When it comes to Elsa and Hawk Moth, Elsa's coldness (in personality as well as power) would be a contrast to Hawk Moth's manipulative and power - hungry nature. She would be very resistant to his attempts to use her for his evil plans.
Ladybug's power of creation with the Lucky Charm could be enhanced by Spiderman's scientific knowledge. He might be able to analyze the Lucky Charm and figure out new ways to use it. For example, if the Lucky Charm is a simple object like a key, Spiderman could use his knowledge to turn it into a tool to unlock a special device that helps them in their fight.
They might start off as rivals. Bridgette, being a positive and helpful character, could see Felix as a bit of a troublemaker at first. But as the story progresses, they find common ground in their understanding of the Miraculous world and start to work together.
Ladybug could use her agility and strategic thinking to work with Pokemon in battles. For example, she could direct a Pikachu's electric attacks against an enemy. Chat Noir might bond with a feline - like Pokemon like Meowth and they could combine their cat - like skills. Alya could be a Pokemon journalist in the fanfiction, reporting on new Pokemon sightings in Paris which are actually related to the Miraculous powers.
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.
With Nino, Adrien has a great friendship. Chloe might see Nino as just another one of Adrien's 'lesser' friends. In fanfiction, Nino could try to get Adrien to see Chloe's true nature, but Adrien is too trusting and gives Chloe the benefit of the doubt.