A fanfiction idea could be that the members of Iron Maiden are secretly wizards from the Harry Potter world who have been living in the Muggle world all this time. They get called back to Hogwarts when a threat emerges that is connected to the Avengers' enemies. They use their music as spells and team up with the Avengers to fight the combined threat. For example, their guitar riffs could be like magic bolts that can stun enemies.
Here's an idea: in a future where the Avengers have saved the world many times, they are looking for new sources of inspiration. They discover the magic of the Harry Potter world through Iron Maiden's music. It turns out that Iron Maiden has been influenced by a wizard who was once a big fan of their music and shared some of the wizarding world's secrets with them. The Avengers then travel to Hogwarts to learn about magic and how it can be used to enhance their powers. Together with Harry Potter and his friends, they face a new threat that combines dark magic and advanced weaponry.
Perhaps there is a magical artifact in the Harry Potter world that is also of great interest to the Avengers' villains. Iron Maiden discovers this through one of their songs which has some cryptic lyrics about it. They then team up with Harry Potter and his friends to protect the artifact from the villains. The Avengers also get involved when they realize the villains' plan could have global consequences. Iron Maiden's music plays a role in both worlds, being able to disrupt the villains' technology in the Avengers' world and enhance magic in the Harry Potter world.
One way to combine them could be to create a multiverse - type story. Imagine Iron Maiden being a band that exists in both the Marvel Universe of the Avengers and the wizarding world of Harry Potter. The Avengers could be on a mission that somehow leads them to Hogwarts. Maybe they need to find a magical object that is hidden there to defeat a powerful enemy. And Iron Maiden's music could be the key to unlocking some hidden magic or power within the school. It would be a wild and creative crossover.
A different plot could be that Iron Maiden is on a world tour when they accidentally stumble upon an alien technology that the Avengers are also after. This technology is the key to stopping an impending alien invasion. The two groups then have to work together, with Iron Maiden bringing their creative thinking and the Avengers their combat skills, to figure out how to use the technology and save the world.
One idea could be that Voldemort teams up with a villain from the Avengers universe, like Loki. This would force the heroes from both worlds to join forces. The Avengers could use their high - tech weapons and superpowers, while the Harry Potter characters would bring their magic to the fight.
Perhaps the wizards from Harry Potter could teach the Avengers some magic. For example, Harry could show them how to use the Patronus charm for protection. In return, the Avengers could introduce the wizards to their high - tech gadgets. Iron Man could be especially interested in the magical properties of things like the Elder Wand. And then there could be a big battle where the combined powers of magic and technology are used to fight off a new, powerful enemy.
Maybe the Time Stone from the Avengers universe gets accidentally sent to the Harry Potter world. This causes chaos as different characters try to use it for their own purposes. Harry and his friends might think it could be used to defeat Voldemort once and for all, while the Avengers are desperate to get it back to prevent time - related disasters in their own universe. Hermione would be very intrigued by the science behind the Time Stone and try to study it, which could lead to some interesting interactions with the science - minded Avengers like Bruce Banner.
Maybe the Infinity Stones are scattered across the Harry Potter universe. The Avengers have to team up with Harry Potter and his friends to retrieve them. During this adventure, a love triangle or rather a harem - like situation develops. For example, Harry Potter could find himself in the middle of a relationship with Pepper Potts and Ginny Weasley. They would all need to work together to stop a new dark force that is attracted to the power of the Stones.
One idea could be that Voldemort teams up with Loki. They both have a thirst for power and chaos. The Avengers and the wizards from Harry Potter's world would have to put aside their differences to fight this new, powerful alliance. Maybe the Time Stone could be involved, with Doctor Strange and Hermione trying to figure out how to use it to prevent the villains from achieving their goals.
Maybe there's a crossover where the Infinity Stones are somehow related to powerful magical artifacts in the Harry Potter world. The Avengers and the Hogwarts students could team up to keep these powerful items out of the wrong hands. This would involve characters like Captain America learning about the wizarding world's history and culture.
Well, an interesting plot could be where Fem Harry Potter's magic is seen as a new form of power in the Avengers' world. She could be recruited by SHIELD to help train the Avengers in new combat techniques using magic. Then there's the idea of a villain from the Harry Potter world teaming up with a Marvel villain, and Fem Harry and the Avengers have to put aside their differences to stop them. Also, what if Fem Harry Potter was an Avenger from the start? How would her presence change the events that already happened in the Marvel movies?
One idea could be to have the Avengers transported into the Harry Potter world. They could use their powers and skills to help in the fight against Voldemort. For example, Thor could use his lightning powers against the Death Eaters, and Iron Man could provide technological support to Hogwarts' defenses.