One idea could be Wolverine getting transported to the DC universe and teaming up with Batman. They could combine their detective skills to solve a mystery that involves both mutants and metahumans. For example, a new villain is creating chaos in Gotham by using some sort of technology that affects Wolverine's healing factor in strange ways.
A really cool plot could be a crossover where Wolverine and Wonder Woman meet. Their different fighting styles and moral codes could create some interesting dynamics. They might start off at odds but then realize they need to work together to stop an ancient evil that is threatening both their worlds. This could involve exploring different mythologies from the Marvel and DC universes.
Another plot could be Wolverine being mistaken for a metahuman in the DC world. He then has to deal with the Justice League's initial suspicion while also trying to find a way back to his own universe. Maybe he gets involved in a fight against a powerful foe like Darkseid, and his adamantium claws prove to be a valuable asset in the battle.
One idea could be a Wolverine and Batman crossover. Wolverine could find himself in Gotham City and team up with Batman to take on a common enemy like Ra's al Ghul who is interested in Wolverine's healing factor. They would have to combine their skills, with Wolverine's brute strength and healing and Batman's detective skills and gadgets.
A great plot could be Wolverine being forced to team up with the Avengers to stop a powerful mutant - hating villain. Wolverine's healing factor and combat skills would be a huge asset, but his distrust of non - mutants could create internal conflict within the team. Maybe Wolverine has a past encounter with the villain that the Avengers don't know about, and this knowledge could be crucial to their victory.
A cool plot could be that Wolverine's past comes back to haunt him during an Avengers mission. His time in Weapon X could be related to the new threat the Avengers are facing. So, the Avengers have to help him deal with his demons while also fighting the enemy. Or perhaps Wolverine discovers a connection between a mutant he knew and an Avenger, which leads to a mystery they have to solve together.
Another plot could involve Gohan being mistaken for a new metahuman in the DC universe. As he tries to find his way back home, he gets caught up in a conflict between the Justice League and a group of supervillains. His Saiyan powers could be the key to resolving the situation.
One idea could be Goku ending up in the DC universe and having a friendly spar with Superman. Their different power sources and fighting styles would make for an exciting encounter. Maybe Goku learns about Kryptonite and how it affects Superman, which gives him a new perspective on weaknesses.
One idea could be the Boys teaming up with a DC hero like Superman, but then realizing his 'good guy' image might be a facade too. Another could be Homelander facing off against Batman in a battle of wits and power.
One idea could be that Naruto and his friends are transported to the DC Universe. Naruto's chakra could be seen as a form of magic in the DC world. He might team up with Superman to stop a powerful villain who is after both kryptonite and Naruto's chakra. Another plot could involve Batman being intrigued by Naruto's ninja skills and trying to incorporate some of them into his own combat style.
A cool plot for dc super heroes crossover fanfiction could involve Wonder Woman and Aquaman. Maybe there's a threat that endangers both Themyscira and Atlantis. They must combine their unique skills, like Wonder Woman's combat abilities and Aquaman's control over the sea, to save their respective homes. Also, a Martian Manhunter and Cyborg crossover could be interesting. The Martian Manhunter's shape - shifting and telepathy, along with Cyborg's technological prowess, could be used to stop a cyber - psychic threat.
Maybe a crossover with the Justice League. The DC Superhero Girls look up to the League, and in this fanfiction, they could be called upon to help when the League is incapacitated by a powerful magic spell. It would be a chance for the girls to prove themselves on a bigger stage.
One idea could be that Naruto, with his Mokuton abilities, gets transported to the DC universe. He might team up with Green Arrow in Star City. Since Naruto can create and control plants, he could help Green Arrow by using the Mokuton to create natural barriers during battles or to track enemies by sensing their movements through the plants. Another plot could involve Naruto meeting Poison Ivy. They could have an interesting dynamic as both have a connection to plants. Naruto might try to convince her to use her powers for good instead of causing chaos.