Another concept could be a story where Peter Parker is studying at a university in the DC universe. He befriends some of the younger DC heroes like Robin. Together, they discover a conspiracy within both universes. The villains from both sides are secretly working together to create a device that can merge the two universes into one, which would give them ultimate power. Spider - Man and Robin then have to gather a team of heroes from both universes to stop this plan.
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.
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.
A crossover with the Avengers is also great. Picture Spider - Man having to prove himself to the more established heroes like Iron Man and Captain America. He could bring his unique street - level hero skills to a big - scale Avengers mission.
Well, a cool Venom and Spider - Man crossover fanfiction idea might be that there's a strange alien invasion. But this time, the symbiotes are being controlled by an even greater evil. Venom, having his own sense of justice, decides to work with Spider - Man. They start off not trusting each other much, but as they face the challenges, they learn to rely on one another. Also, perhaps Spider - Man has to deal with some of Venom's more violent tendencies during the fight.
One idea could be a crossover between Spider - Man and an original character (OC) who has the power to manipulate time. The OC could accidentally disrupt the timeline in Spider - Man's world, leading to all sorts of chaos like villains getting released early or important events not happening as they should. This would force Spider - Man to team up with the OC to fix the timeline.
One idea could be that Spider - Man and Batman are both chasing the same villain who has some sort of technology that can disrupt Gotham and New York. Spider - Man's agility and Batman's detective skills would make for an interesting combination as they try to track down the bad guy. Maybe they start off not trusting each other, but as they face challenges together, they learn to work as a team.
Another interesting concept is that Spider - Man gets cursed by a witch. As a result, his spider - sense becomes a supernatural sense that not only warns him of physical danger but also of impending magical threats. He then has to find a way to break the curse while still protecting the city from various supernatural menaces.
One idea could be a crossover with the X - Men. Spider - Man could team up with Wolverine to take on a common enemy like Magneto. Wolverine's tough and no - nonsense attitude would contrast well with Spider - Man's quippy nature.
One idea could be that Naruto is somehow transported to New York City and meets Spider - Man. They team up to fight a common enemy like a group of ninjas who have also been brought to the city by some sort of magic or science experiment gone wrong. Another plot could be that Spider - Man gets some of Naruto's powers and has to learn how to control them while still dealing with his normal life in the city. Maybe the symbiote from Spider - Man's story could combine with some of Naruto's chakra and create a whole new kind of threat that they have to face together.
One idea could be that Deadpool and Spider - Man team up to take on a new supervillain who has the ability to manipulate time. Spider - Man uses his quick thinking and acrobatic skills, while Deadpool's unorthodox fighting style and regeneration ability keep them in the fight.
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.