Well, you could have a story where the Hulk is in a forest that has been infected by the Creepypasta entity known as the Rake. The Hulk's anger could be triggered not just by the Rake attacking, but also by the overall eerie and menacing atmosphere. Or perhaps Iron Man finds himself in a digital world full of Creepypasta - inspired glitches and horrors, like the ones from BEN Drowned. He has to use his technology to fight off these digital terrors while also trying to find a way back to the real world.
One idea could be to have Spider - Man encounter the Slenderman. Picture Spider - Man swinging through the city and suddenly coming across the tall, faceless figure in an alley. Another could be Loki causing chaos in a Creepypasta - like town, using his magic to create creepy illusions. Maybe the Avengers have to deal with Jeff the Killer, who somehow gets superpowers and becomes an even more dangerous threat.
One idea could be a crossover between Slenderman and Jeff the Killer. They could team up to terrorize a small town in a way that combines their unique horror elements. For example, Slenderman could use his mind - controlling abilities to create chaos while Jeff the Killer goes on his bloody rampage.
One idea could be a crossover between the X - Men and the Avengers. Imagine Wolverine teaming up with Captain America in a battle against a common enemy like Ultron. Another could be a Spider - Man and Doctor Strange crossover, where Spider - Man's quick thinking and agility combine with Doctor Strange's magic to solve a multiverse - level threat.
One idea could be a dementor - like Creepypasta character that haunts Hogwarts. It could drain the happiness not just of students but also start affecting the very magic of the school. Another could be a character from Creepypasta getting lost in the Forbidden Forest and encountering magical creatures in a much more menacing way than the usual. Maybe a Creepypasta villain who tries to steal the Philosopher's Stone for some dark and twisted reason related to their own strange world.
One idea could be a story where the dementors from Harry Potter cross over into the Creepypasta world. They could start spreading their despair in the already creepy and dangerous Creepypasta settings, making it even more nightmarish. Another could be a crossover where a Harry Potter character like Hermione accidentally enters a Creepypasta realm and has to use her magic and wits to survive among the various Creepypasta entities.
One idea could be crossing Slenderman with Jeff the Killer. Maybe they team up to haunt a small town, and the story could focus on the survivors' attempts to figure out their motives and weaknesses. It would be a great way to combine two iconic Creepypasta characters.
A crossover with Doctor Strange could be really cool. Maybe they have to deal with a magical threat that is spreading across different dimensions. Captain Marvel's strength and Doctor Strange's magic would create an interesting dynamic as they try to figure out how to stop it.
How about a story where the Avengers are pitted against Dio? The Avengers would have to deal with Dio's time - stopping ability with their own powers. Iron Man could try to create a device to counteract Dio's time stop, while Captain America uses his strategic skills to lead the fight against Dio's minions.
One idea could be that Batman finds himself in the Marvel universe due to a strange multiverse rift. He teams up with Iron Man to stop a tech - based villain who is stealing advanced technology from both their worlds. Another could be Batman and Spider - Man working together in Gotham. Spider - Man's acrobatics and sense would be a great addition to Batman's detective skills.
A cool dc marvel crossover fanfiction might involve Batman and Iron Man. Picture Batman being intrigued by Iron Man's high - tech gadgets and the two of them collaborating to create an even more advanced piece of technology to defeat a new breed of super - criminals that are using alien and advanced Earth - based tech.
A great concept for Marvel Avengers crossover fanfiction is to have the Avengers cross paths with the Fantastic Four. The two teams could collaborate on a scientific project that goes awry, creating a new threat that only their combined powers can defeat. Another possibility is a crossover with the Eternals. Since the Eternals have been on Earth for a long time but hidden, their discovery by the Avengers could lead to a complex relationship. They might initially be at odds, but then realize they need to work together to stop a greater evil that is awakening on Earth. Also, an Avengers crossover with Blade would be interesting. Blade could seek the Avengers' help in fighting a new breed of vampires that are more powerful than ever and have ties to some dark magic that the Avengers have to figure out.