Sasuke and Black Widow. Both are complex characters with a dark past. They could bond over their experiences of loss and redemption. Black Widow might be able to teach Sasuke some new combat techniques, while Sasuke could show her some of his ninjutsu skills. It would be interesting to see them on a stealth mission together.
Eggsy and Iron Man would make a great pair. Eggsy is a bit more rough - around - the - edges and from a different background, while Tony Stark is a genius billionaire. They could bounce off each other with their different perspectives. Eggsy might be in awe of Stark's technology at first, but then start to contribute his own unique ideas, and Stark could be amused and intrigued by Eggsy's street - smart solutions to problems.
I think Loki and Mal would make a very interesting pairing. Loki is known for his trickery and Mal has her own devious side. They could either be at odds, constantly trying to out - scheme each other, or they could team up for some self - serving purpose. Their combined cunning could lead to some very unpredictable and exciting storylines.
Supergirl and Black Widow would be a great pairing too. Black Widow could teach Supergirl some stealth and espionage skills, while Supergirl could show Black Widow the power of flight and super - strength. They could also bond over their experiences of being different in their respective worlds.
Another great pairing would be Superman and Captain America. Superman is an alien with god - like powers, while Captain America is a human with peak physical and moral strength. Cap could teach Superman about the value of human tenacity and leadership on a more down - to - earth level. And Superman could show Cap what true superhuman power looks like. They could work together to inspire the rest of the Avengers and any other heroes they encounter in a battle.
Mr. Incredible and Hulk. Just think about it. They both have incredible strength, but they also have different personalities. Mr. Incredible is more family - oriented and used to working in a team with his family. Hulk is more of a lone force, but when they team up, their combined strength could be unstoppable. They could have a great dynamic, like Mr. Incredible trying to calm Hulk down when he gets too angry or Hulk teaching Mr. Incredible some new ways to use his strength in a more brute - force manner.
Optimus Prime and Captain America would be really interesting. They are both natural leaders, with a strong sense of justice. Optimus is a noble leader of the Autobots, and Captain America is the moral compass of the Avengers. They could share their leadership experiences and strategies.
For an Arrow - Avengers crossover fanfiction, some really interesting character pairings could emerge. For instance, Malcolm Merlyn and Loki. Malcolm is a master manipulator and Loki is the God of Mischief. They could either team up to cause chaos or be in a constant battle of wits. Also, Cisco Ramon from The Flash (since he often crosses over with Arrow) and Bruce Banner. Cisco could be fascinated by Banner's scientific knowledge and Banner could be interested in Cisco's work on the multiverse. And of course, Quentin Lance and Nick Fury. Quentin, as a police detective, and Nick Fury, as the head of S.H.I.E.L.D., could share their insights on how to keep their respective cities and the world safe.
Black Widow and a sneaky, intelligent minion from the Overlord world would be cool. Black Widow could use her spy skills to outwit the minion, or they could end up working together for some strange reason. Maybe the minion has some information she needs to save the Avengers who are trapped in the Overlord world.
I think Naruto and Iron Man would be really interesting. Naruto's naive yet determined nature would contrast with Iron Man's sarcastic and high - tech personality. They could learn a lot from each other, like Naruto learning about advanced technology and Iron Man learning about the power of will and chakra.
Definitely Ben Tennyson and Iron Man. Tony Stark's high - tech gadgets and intelligence would pair well with Ben's Omnitrix. They could exchange knowledge about technology and come up with some really cool inventions together. Also, Iron Man could probably upgrade the Omnitrix in some way.