One interesting crossover could be having Midoriya from MHA gain Spider - Man's powers. He could use his One For All quirk in combination with the web - slinging ability. Picture him swinging between the skyscrapers of Musutafu while also using his super strength in combat. Another idea is Peter Parker attending UA High. He'd bring his scientific knowledge and web - shooting skills, and would probably befriend characters like Izuku and Bakugo. He could also learn some new combat moves from the hero students there.
Well, a crossover could also focus on the technology aspect. In the Spider - Man world, there's a lot of advanced tech like his web - shooters. In MHA, there are various support items. So, a fanfic could explore how the two worlds' technologies are combined. For example, Mei Hatsume could work on improving Spider - Man's web - shooters or Peter could introduce some of his tech to the support course students at UA. This would lead to some really interesting inventions and upgrades for both universes.
The 'team - up' trope is always popular. Whether it's Spider - Man teaming up with Deku and his friends to take on a powerful villain, or the MHA heroes joining Spider - Man to fight a threat in New York. Also, the 'mentor - mentee' trope can work well. Spider - Man could mentor a young hero in MHA, teaching them about responsibility and using their powers effectively.
One interesting crossover is 'When Worlds Collide'. In this fanfiction, the universes of Iron Man and Spider - Man somehow get merged. This leads to some really unique situations, like Spider - Man having to deal with Iron Man's high - tech world in a whole new way. Another is 'The Tech - Web Alliance'. Here, they form an alliance to fight a villain who is using both high - tech and some sort of web - related powers. It's a really cool concept that combines their two skill sets.
His spider - sense would be a very useful power in the MHA universe. Given that many battles in MHA involve sudden attacks and surprises, Spider - Man's ability to sense danger before it happens would give him an edge. He could use this to warn his MHA allies and prevent ambushes. Also, his super strength would make him a formidable force against the powerful villains in the MHA world. He could hold his own against even the strongest quirks, like All - Might's strength - based quirk.
One interesting crossover could be Naruto's chakra system being studied by Spider - Man 2099's advanced scientific mind. Maybe he could find a way to use chakra - like energy in his web - slinging or combat. Another could be Naruto teaching Spider - Man 2099 some of his ninja skills, like stealth or hand - to - hand combat techniques. And a really wild one could be a fusion of their powers, where Spider - Man 2099 has some of Naruto's nine - tailed fox power in his enhanced form.
One interesting crossover could be where Spider - Man finds himself in the Twilight world. Maybe he has to deal with the vampires and werewolves while trying to keep his identity a secret. He could use his web - slinging skills to navigate the forests of Forks.
In some fanfictions, Ultron might team up with one of Spider - Man's villains, like the Green Goblin. They could create a plan to take over New York. Spider - Man would then have to face this powerful alliance. He might seek help from other superheroes he's associated with, like Iron Man or Daredevil, to combat this new threat.
A great crossover idea could be a team - up between Spider - Man and Deku. They could learn from each other's sense of responsibility. Spider - Man has been dealing with the weight of his powers for a long time, and Deku is constantly growing into his role as a hero. They could share their experiences and fight a common villain that threatens both their worlds.
Perhaps in the fanfiction, some of the Fairy Tail characters could gain Spider - Man - like powers. Natsu, for instance, could have the ability to shoot fire - webs from his hands. This would not only add a new dimension to his fighting style but also create some really cool and unique battle scenes where he combines his fire - based attacks with web - like maneuvers.
One interesting crossover could be Spider - Man using his agility to outmaneuver the Hulk during a battle in a fanfiction. His webs could be used to slow down the Hulk's rampage.
In a Power Rangers and Spider - Man fanfiction crossover, perhaps the Green Ranger has a special connection to Spider - Man. The Green Ranger's power coin gets corrupted by some sort of dark magic from another dimension. Spider - Man, with his scientific knowledge, helps the Power Rangers figure out how to cleanse the power coin. In the process, they have to battle evil versions of the Power Rangers that are being controlled by the dark magic. The Rangers and Spider - Man use their unique abilities, like the Rangers' morphing and combat skills and Spider - Man's spider - sense and web - slinging, to overcome this threat.