Sam Winchester and Bruce Banner would also make an interesting pair. Sam is the intelligent researcher in Supernatural, and Bruce is a brilliant scientist in the Avengers. They could collaborate on some scientific research, like trying to find a way to control the Hulk's power using the knowledge Sam has about the supernatural forces. It would be fascinating to see how their different areas of expertise blend together.
Another great crossover could be Dean Winchester and Captain America. Dean is a tough hunter, used to fighting all kinds of monsters. Captain America is a symbol of justice and heroism. If they meet, they could exchange their combat skills and values. Maybe Dean could teach Cap some of his street - smart fighting techniques, and Cap could inspire Dean with his selfless and patriotic spirit.
One interesting crossover could be a story where the Avengers are facing a threat that has a supernatural origin, and they seek the help of the TFW. Maybe the Avengers are dealing with a horde of demons that they can't defeat with their usual technology and powers, and Sam, Dean, and Castiel come to the rescue with their knowledge of the supernatural 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.
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.
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.
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.