Well, in these fanfictions, we might see characters like Hermione using her intelligence to figure out the science behind the superpowers in Marvel. She could befriend Bruce Banner and they could exchange knowledge. And Harry could learn some combat skills from Captain America, which would be really cool as he combines his wizarding skills with physical combat abilities.
One interesting aspect could be the magic of Harry Potter combined with the superpowers in Marvel. For example, imagine Harry using his Patronus charm while fighting alongside Iron Man. The Patronus could act as a distraction or even a form of defense against some of the villains in the Marvel universe.
One interesting crossover could be the use of magic from 'Harry Potter' in the Marvel universe. For example, a wizard from Hogwarts might find themselves in New York City and use spells to interact with the superheroes there. Maybe they could use a levitation charm to help Iron Man when his suit malfunctions in mid - air.
One interesting crossover could be the use of magic from Harry Potter in the battles of the Avengers. For example, Hermione's intelligence and knowledge of spells could help the Avengers come up with new strategies. Another aspect could be the idea of an immortal character from the Potterverse interacting with the Avengers. Maybe a powerful wizard or witch becomes an ally of the Avengers and uses their magic to enhance the team's capabilities.
In a fanfiction of this kind, we might see the Hogwarts houses incorporated into Star Trek. The Sorting Hat could be brought into the Star Trek universe and sort the crew members. Spock might be a Ravenclaw for his intelligence, while Kirk could be a Gryffindor. Also, the idea of the Deathly Hallows in the Star Trek world is fascinating. The Elder Wand could be a powerful weapon against the Klingons or other enemies.
One interesting crossover could be Harry using his magic in the world of the Justice League. For example, he could use spells like 'Accio' to retrieve important items during a Justice League mission. Maybe he'd team up with Superman and use magic to enhance Superman's powers in a unique way.
One interesting crossover could be the use of magic in the Marvel universe. For example, a fanfic might have Doctor Strange encounter a Hogwarts student who has accidentally traveled to the Marvel universe and they team up to fight a common threat. Another could be a scenario where the Avengers visit Hogwarts to learn about magic for a special mission. Maybe Thor is fascinated by the magic there and tries to learn some spells.
Well, in some fanfiction, we might see Anna and Kristoff visiting Hogwarts. They could be amazed by the moving staircases and magical creatures. In reverse, Harry, Ron and Hermione could end up in Arendelle. Hermione might be intrigued by the way Elsa controls her ice powers and try to find a scientific or magical explanation for it. Also, the Dementors from Harry Potter could be compared to the dark forces in Frozen 2, like the mist that Elsa has to face.
One interesting crossover could be the use of magic in the Avengers world. For example, Hermione could use her knowledge of spells to help the Avengers solve a problem that technology couldn't. Maybe she could use a spell to break through an impenetrable force field created by an enemy. Another aspect could be the Avengers characters learning magic. Tony Stark might be fascinated by the concept of magic and try to incorporate it into his technology. Or Thor could share his knowledge of Asgardian magic with the Hogwarts students.
One interesting crossover could be a scenario where Hermione uses her magic to help Elsa control her powers better. Maybe she creates a spell that can soothe Elsa when she's about to lose control.
In some fanfiction, Maleficent might team up with a dark wizard from the Harry Potter universe. They could combine their powers to try and take over both the wizarding world and the fairy - tale land where Maleficent comes from. This would create a complex power struggle with the heroes having to find new ways to combat them.
One interesting crossover could be the characters from Harry Potter visiting Narnia. For example, Harry, Ron, and Hermione might find themselves in Narnia through some magical accident. They could then interact with the talking animals and magical beings there, like how they interact with the magical creatures in their own wizarding world. Maybe they would help the Narnians in a battle, using their unique Hogwarts - taught magic.