In some Harry Potter and Max Steel fanfiction, there could be a situation where the characters from both worlds meet at a neutral place. They would have to learn to work together. The Hogwarts students could learn about teamwork from Max Steel and his friends. And Max Steel could learn about the importance of knowledge and wisdom from the wizards at Hogwarts. They could then use their combined skills to face a common enemy, like a powerful dark wizard who has also got hold of some advanced technology.
One interesting crossover could be the use of magic in the Max Steel world. For example, Harry Potter characters could bring their spells to help Max Steel in his battles against villains. Maybe they could use the 'Stupefy' spell to stun the bad guys that Max Steel usually has to fight physically.
The character interactions are also interesting. Imagine Harry's cautious and sometimes rule - following nature with Max Steel's more adventurous and risk - taking attitude. Their conversations and how they grow to understand each other can be a great part of the fanfiction. For example, Max might introduce Harry to some new ways of thinking outside the box of magic, and Harry could show Max the depth and complexity of the magical world.
One interesting Max Steel fanfiction could be about Max's new powers emerging in unexpected ways. For example, he might discover he can control a new type of energy that wasn't part of his original set of abilities. This could lead to him having to learn how to use it while also facing a new enemy who is attracted to this new power.
There's a fanfiction I heard of where Max Steel enters the Hogwarts world. In this story, Max has to adapt to the magical rules while also using his unique powers. It shows how he interacts with Harry and his friends, and how they all learn from each other's different abilities.
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.
One interesting crossover could be the use of spells. For example, a Charmed one might learn a spell from the Harry Potter world like the Patronus charm. It could be used in a new and different way in the Charmed universe, perhaps to fight a new type of demon that is vulnerable to positive magic like a Patronus.
One interesting crossover could be Superman visiting Hogwarts. He might be amazed by the magic there. Maybe he tries to learn some spells, but his superpowers interfere. For example, when he tries to use a levitation charm, his super strength makes the object fly out of control.