One idea could be a story where Naruto is transported to the Marvel Universe and teams up with Captain Marvel. They could face a common enemy like an alien invasion that threatens both the ninja world and Earth. Naruto's unique jutsu and Captain Marvel's superpowers would make for an interesting combination in battle.
Perhaps a story where an ancient evil from Naruto's world has a connection to a villain in the Marvel Universe. Naruto and Captain Marvel are brought together by a prophecy. They initially have trouble understanding each other due to their different cultures and ways of fighting, but they gradually learn to work together and defeat the combined threat.
One idea could be a story where Captain America and Captain Marvel team up to face a new cosmic threat that's headed towards Earth. They have to combine their unique skills, with Captain America's strategic mind and combat experience on the ground, and Captain Marvel's incredible cosmic powers in space battles.
One idea could be a story where Naruto is transported to the DC universe and teams up with Captain America. They could fight against a common enemy like Darkseid. Naruto's unique jutsu and Captain America's combat skills would make for an interesting combination.
One idea could be that Captain America is somehow transported to the RWBY universe. He could team up with Team RWBY to fight against the Grimm. His shield would be a unique weapon in that world, and his leadership and combat skills would be highly valuable.
One idea could be a crossover where Captain Cold somehow ends up in the wizarding world. Maybe he's on the run from the Flash and uses a magical artifact in Central City that zaps him into Hogwarts. He could initially be seen as a threat but then team up with Harry Potter to fight a common enemy, like a dark wizard who has acquired some sort of technology -mixing magic and science in a dangerous way.
A fanfiction could revolve around a spell gone wrong in the Harry Potter world that accidentally transports Ms Marvel there. She then has to navigate the wizarding world while also trying to find a way back home. Along the way, she teams up with Hermione to study the magic that brought her there and in the process, they learn from each other's worlds.
In a fanfiction of Harry Potter, Captain Marvel and lemon, it could be that lemon is a new spell or potion ingredient in the wizarding world. Captain Marvel somehow gets transported there. She's confused at first but quickly adapts. Harry Potter and his friends are intrigued by her powers. They all work together to create a new potion using the lemon ingredient that can give temporary superpowers to wizards. This leads to a series of adventures as they try to keep the potion's recipe safe from dark wizards.
One idea could be that Peter Parker and Captain Marvel are teamed up to face a powerful cosmic threat that's approaching Earth. They initially clash due to their different approaches - Peter is more street - level and cautious, while Captain Marvel is bold and used to dealing with large - scale threats in space. But as they get to know each other better, they start to combine their powers effectively, with Peter using his spider - sense to anticipate the enemy's moves and Captain Marvel delivering powerful blows.
One idea could be that Captain Marvel and Spiderman team up to fight a powerful alien threat that has invaded New York City. Spiderman uses his agility and web - slinging skills to distract the alien while Captain Marvel blasts it with her energy powers.
One idea could be that Captain Marvel and Black Widow are on a mission together to infiltrate a powerful and secretive organization. They have to rely on each other's unique skills, with Captain Marvel using her super strength and flight to get them in and out of tight spots, while Black Widow uses her espionage expertise to gather intel.
One idea could be a story where War Machine and Captain Marvel team up to face a new, powerful alien threat that neither could handle alone. They start off not getting along well due to their different combat styles and personalities. War Machine is more about military - style tactics and high - tech weaponry, while Captain Marvel has her cosmic powers. But as they battle the alien menace, they learn to respect each other's strengths and work together in harmony to save the Earth.