I think Spider - Man and Flash would be an exciting pair. Flash's super speed and Spider - Man's spider - sense could create some really cool action scenes. They could have a friendly competition while also teaming up to stop a villain who is using speed - related technology to rob banks all over both universes.
Definitely Spider - Man and Harley Quinn. Their personalities are so different. Spider - Man's quippy and responsible nature against Harley's chaotic and unpredictable self would make for some really fun and interesting interactions.
Spider - Man and Green Lantern would be really interesting. Spider - Man's quick thinking and acrobatic skills combined with Green Lantern's power of creating constructs could lead to some amazing fight scenes and problem - solving moments.
Spiderman and Batman would be really interesting. They are both intelligent and resourceful. Batman has his gadgets and detective skills, while Spiderman has his super - strength and web - slinging. They could learn a lot from each other.
Wonder Woman is another great choice. Her strong moral code and powerful abilities would be an interesting counterpoint to Deadpool. He might be in awe of her at first, and then start trying to crack jokes and get on her nerves, but they could also form an unlikely friendship as they fight together against a common enemy.
Saitama and Batman would be really interesting. Batman is a normal human with no superpowers but incredible skills and intelligence. Saitama is the opposite, having unlimited power but a rather simple - minded approach. Their interaction would be full of contrasts, like Batman trying to analyze Saitama while Saitama is just looking for a good fight or a cheap sale at the supermarket.
Gohan and Wonder Woman would be an interesting pair. Wonder Woman's combat skills and her connection to the gods could be a great match for Gohan's Saiyan powers. They could learn from each other's fighting styles and cultures.
I think Spider - Man and Harley Quinn could be a really interesting pair. Harley's chaotic nature and unpredictable behavior would mix well with Spider - Man's sense of responsibility. They could start off as unlikely allies, with Harley initially trying to play tricks on Spider - Man but then realizing they have a common enemy and working together in a really unique way.
Peter Parker and Lex Luthor could be a fascinating duo in a different way. Luthor might initially try to use Spider - Man's powers for his own gain, but Spider - Man outsmarts him. This could lead to a complex relationship where Luthor is constantly trying to manipulate Spider - Man, but Spider - Man is always one step ahead, all while they are in the middle of a bigger conflict involving other heroes and villains from both universes.
I think Spider - Man and Flash would make for a really fun pair. They both have a sense of speed in different ways. Flash has his super - speed, while Spider - Man can move quickly through the city with his webs. They could have races, and Flash could probably teach Spider - Man how to move even faster. Also, their personalities are quite friendly, so they would likely get along well and have some humorous exchanges in the fanfiction.
I think Naruto and Green Arrow would be an interesting pair. Naruto's brash and energetic nature would contrast with Green Arrow's more serious and calculated demeanor. They could learn from each other's combat styles. Naruto could show Green Arrow some acrobatic moves inspired by his ninja training, and Green Arrow could teach Naruto how to be more precise with long - range attacks using his arrows.
I think Naruto and Batman would be an interesting pair. Naruto is all about his big - hearted, energetic ninja ways, while Batman is the brooding, strategic detective. They could learn a lot from each other. Naruto could teach Batman about the importance of believing in oneself and having unwavering determination, and Batman could teach Naruto about strategic planning and using the environment to his advantage.