There could be a fanfiction where Superman is accidentally transported to the Avengers' universe. At first, there might be some mistrust from the Avengers as they don't know him. But as they see his heroic deeds, they start to work together. For example, Superman could help Captain America in a fight against a super - powered foe by using his speed to quickly take out the enemy's support forces, while Captain America leads the main assault.
Well, in some fanfiction, Superman might teach the Avengers about his Kryptonian technology. This could lead to new inventions within the Avengers' world. Also, a crossover could involve Superman's nemesis, Lex Luthor, teaming up with one of the Avengers' villains, like Ultron. It would create a really complex and exciting plot with two brilliant minds causing chaos for both Superman and the Avengers.
One interesting crossover is when Superman's code of ethics clashes with the Avengers' more flexible approach. It creates a lot of drama and character development. For instance, in some stories, Superman has to decide whether to follow the Avengers' plan which might involve a bit of collateral damage, something he's not used to in his own world.
In some fanfictions, there might be a plot where the Avengers mistake Ben for a threat at first. But then they realize his good intentions when he helps them fight a common enemy. This adds an element of misunderstanding and then friendship, which is quite common and engaging in crossovers.
One interesting crossover could be the Flash from Arrowverse meeting Quicksilver from the Avengers. They could have a race to see who is truly the fastest. Another could be Green Arrow teaming up with Hawkeye for an archery - based mission where they share their different techniques and arrow - making skills.
A possible crossover could involve the technology of Kingsman, such as their fancy suits and gadgets, being integrated into the Avengers' gear. The Kingsman's bulletproof suits and high - tech umbrellas could give the Avengers an edge in combat. Also, the different cultures and protocols of the two groups would create some interesting clashes and comical moments as they try to work together.
Crossovers that involve the villains from both universes teaming up are also quite fascinating. For example, Loki from the Avengers and Orochimaru from Naruto joining forces. The heroes then have to come up with a strategy that takes into account the different powers and motives of these two very different villains. It's a great way to create high - stakes situations and see how the heroes from two different universes can work together to overcome a common foe.
The cultural clash is also a really interesting aspect. Kagome comes from a very different cultural background than the modern - day Avengers. So seeing how she reacts to things like Stark's flamboyant lifestyle or Captain America's old - fashioned values can make for some great reading. In some fanfictions, this clash leads to humorous situations as well as deep character growth for both Kagome and the Avengers.
In some fanfictions, the technology in Ben 10's world might be combined with Stark's technology in the Avengers. Maybe Ben's Omnitrix could be enhanced by Stark's knowledge, creating a more powerful device that helps them in a battle against an alien invasion. This would involve a lot of scientific discussions and teamwork between Ben and the Avengers, especially Tony Stark.
The crossover where Batman takes on the role of a strategist for the Avengers during a major battle against an alien invasion. His tactical mind helps the Avengers in a way they've never experienced before.
One interesting crossover could be the Avengers teaming up with the Miraculous heroes to fight a common super - powerful villain. For example, Thanos could be a threat to both the Marvel Universe and the world of Miraculous. The Avengers' brute strength combined with the Miraculous holders' unique powers would make for an epic battle.
One interesting crossover could be Stiles using his wits to outsmart Loki. Stiles is known for his intelligence in his own universe, and facing off against Loki's trickery would make for an exciting story. Maybe he could use his knowledge of the supernatural to help the Avengers deal with magical threats.