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.
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.
The interaction could be complex. The United Nations representatives in the fanfiction might try to coordinate efforts between different Countryhumans and the FBI. The FBI agents, on the other hand, would be used to a more direct approach. Some Countryhumans might be eager to cooperate with the FBI to show their loyalty to international law, while others might resist the United Nations' attempts at regulation. For example, a powerful Countryhuman might see the FBI's presence as an infringement on their sovereignty, but the United Nations would try to smooth things over and convince them to work together for the greater good.
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.
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.
One possible plot could be that Ladybug and Chat Noir are invited to the United Nations as representatives of Paris. They give a speech about the importance of unity in the face of akuma attacks. Meanwhile, Hawk Moth tries to send an akuma to the UN building but Ladybug and Chat Noir, with the help of new international superhero friends they make at the UN, manage to stop it.
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.
The wizard characters might initially be very cautious. For example, Hermione would likely be the one to do a lot of research on Muggle UN representatives and how to best communicate with them. She would probably try to find common ground in terms of goals like world peace and protection of all beings, magical or not.
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.