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.
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.
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.
One idea could be that Spider - Man gets accidentally transported to the DC universe. He teams up with Batman to take on a new villain that is a combination of their rogues' galleries. For example, a villain who has the powers of Electro and can also control minds like Brainiac.
One idea could be that Spider - Man gets accidentally transported to the DC universe. He teams up with Batman to take on a common enemy like the Joker who has somehow gotten his hands on some Oscorp tech. They combine their detective skills and combat abilities to stop the chaos.
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.
Perhaps in the fanfiction, Spider - Man's sense of humor clashes with the more serious tone of the DC heroes at first. But then they realize they can learn from each other. For example, Superman could teach Spider - Man how to better control his strength, while Spider - Man shows the DC heroes how to have a more light - hearted approach in the face of danger. And they all come together to fight a common enemy like Darkseid who has somehow managed to get his hands on some of Spider - Man's tech.
Iron Man is a great character to pair with Spider - Man. Tony Stark can act as a mentor to Peter Parker, providing him with new and advanced tech for his suit. They also have a fun dynamic, with Stark's sarcasm and Spider - Man's youthful exuberance.
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.
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.