One idea could be a Venom crossover with Spider - Man in an alternate universe where they have to team up against a common enemy like Carnage. Another could be a Venom and Deadpool crossover, with their crazy personalities clashing and then somehow working together. Maybe a Venom crossover with the X - Men, where Venom's alien nature causes some interesting reactions among the mutants.
One idea could be Venom bonding with Hulk. Imagine the power boost and the chaos they could cause together. Another is Venom facing off against Thor. The contrast between Thor's godly powers and Venom's alien abilities would make for an exciting battle. Also, Venom could team up with Black Widow and use his stealth and her combat skills for some undercover missions.
Perhaps Venom could cross over with the Guardians of the Galaxy. Venom's dark and edgy nature would contrast well with the Guardians' more light - hearted and space - faring adventures. They could be forced to work together to stop a powerful alien threat that is drawn to Venom's symbiote powers.
Another interesting plot could be that a mad scientist creates a device that can separate Venom from his host. However, the separation goes wrong and the symbiote energy starts to spread across the city, infecting people. Spider - Man and Venom must work together to find a way to contain the energy and save the city.
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 an OC who is a scientist trying to find a cure for the Venom symbiote's negative effects. This OC could have a complex relationship with Venom, initially seeing it as a subject to study but later developing a bond. Another idea is an OC that is a street - level hero who teams up with Venom to fight crime in a seedy part of the city. They might have different methods but find common ground in protecting the innocent.
Another interesting concept is an OC who is a scientist researching Venom's origin. They accidentally get infected and use their new powers to help the Avengers in a unique way. For example, they could have enhanced senses that allow them to detect threats before the Avengers even know they're there. They also have to struggle with the dark side of the Venom symbiote while trying to be a hero.
One idea could be that Venom somehow gets transported to the Harry Potter universe. Maybe it attaches itself to a Hogwarts student who then has to deal with its alien powers and instincts while also trying to keep it a secret from the teachers and other students. For example, if it attached to Neville, it could give him a newfound confidence and strength, but also cause chaos as he tries to control it.
Well, a cool plot could be that there's a scientific experiment gone wrong that fuses Venom and Spider - Man's powers in an unexpected way. They have to figure out how to control these new combined abilities while also dealing with villains who want to steal their power source. Or perhaps Venom gets amnesia and Spider - Man has to convince him that they were once enemies but now need to work together. There could also be a story where Venom's offspring has a different relationship with Spider - Man, like it's more of an anti - hero sidekick.
One idea could be that Peter tries to find a way to coexist with Venom without losing his own mind. He could use Venom's powers for good in a new and unique way, like being able to heal people with Venom's symbiotic abilities. Another plot could be Venom getting separated into multiple parts and Peter has to track them all down before they cause chaos. Maybe one part of Venom attaches to a villain and gives them enhanced powers that Peter has to face.
One idea could be Venom and Spider - Man teaming up against a new, more powerful symbiote that threatens the city. They have to put aside their differences and use their combined powers to defeat it.