For me, a crossover with Black Widow would be fascinating. She could teach Spider - Man some espionage skills. And Spider - Man's natural charm could add a bit of humor to their interactions as they go on a mission together, perhaps to take down a secret organization.
A crossover with Captain America could be great too. Spider - Man, with his youth and modern - day sensibilities, could learn a lot from Cap's old - fashioned values. They could fight side by side against Hydra agents or other villains, and Spider - Man could show Cap some new tricks when it comes to acrobatics in combat.
One idea could be a crossover with the X - Men. Spider - Man could team up with Wolverine. Their different fighting styles would make for some amazing action scenes. Wolverine's brute strength and healing factor combined with Spider - Man's agility and web - slinging abilities would be a great combination.
The Avengers are very popular. Characters like Captain America and Thor are often paired with Spider - Man. Their different powers and personalities create interesting dynamics. For example, Captain America's leadership and old - fashioned values contrast with Spider - Man's youthful and sometimes impulsive nature.
A Spider Man and Nebula fanfiction could be really interesting. Maybe it could be about Spider Man getting accidentally transported to the Guardians of the Galaxy's universe and teaming up with Nebula. They could use their unique skills to fight a common enemy, like a powerful alien warlord who wants to destroy both their home planets.
There could be a situation where a Transformer's technology gets mixed with Oscorp's experiments. This creates a new kind of threat that Spider - Man has to face. The Transformers get involved because it's their technology that's been misused. Together, they figure out a way to reverse the effects and defeat the new hybrid - like villains.
Black Cat could be in the harem as well. She has a flirty and complex relationship with Spider - Man. Then there are other characters like Felicia Hardy who might be included. Her cat - burglar persona and her feelings for Spider - Man could make for an exciting addition to the group of characters in the fanfiction.
Spider - Man himself, Peter Parker, is obviously one of the most popular. He is the central character, and fans love to read about his adventures, his struggles with his powers, and his attempts to balance his normal life with his superhero identity.
I really like Yu Narukami from Persona 4 in the crossover. He brings his calm and collected leadership from his own game. His ability to analyze situations and keep the group together is really cool when he's interacting with the Persona 5 characters.
Well, if Spider - Man met Ruby, he'd probably be intrigued by her enthusiasm and her weapon, Crescent Rose. Ruby, in turn, would be in awe of Spider - Man's powers. They might start off a bit cautious around each other, but once they realize they're both fighting for good, they'd become friends quickly. Spider - Man could teach Ruby some new acrobatic moves, and Ruby could show Spider - Man how to better use his environment in combat like she does in the RWBY world.
The interaction would be really interesting. Spider - Man, being from a different world, would bring a new perspective to the RWBY characters. For instance, he could teach them about his concept of 'with great power comes great responsibility'. Weiss might be a bit snobbish at first towards Spider - Man, but as she sees his heroics, she would come to respect him. And Spider - Man would have to adapt to the different social hierarchies in the RWBY world. He might find the Faunus situation quite different from what he's used to in his own world and try to help promote equality in Remnant.
For Spider - Man, you can show his growth in dealing with a more morally ambiguous ally like Venom. He could start off being very cautious and distrustful, but as they face challenges together, he begins to understand Venom's perspective more. For Venom, you could develop his character by exploring his internal struggle between his violent symbiote nature and his human side's sense of right and wrong. Maybe he starts to become more heroic under Spider - Man's influence.