One idea could be that the Deathly Hallows from Harry Potter have some sort of connection to the powers of the God of Death in the Avengers universe. Maybe the Elder Wand could be a weapon that has the power to control the souls like the Infinity Stones do in the Avengers. The Invisibility Cloak could be used by a character from the Avengers to sneak around in a world filled with magic, similar to how Harry used it at Hogwarts.
A crossover could function through a portal or some sort of magical event that links the two worlds. For instance, the Tesseract in the Avengers universe could malfunction and open a portal to the Harry Potter world. Then, the Avengers find themselves in a world full of magic and wizards. They soon learn about the God of Death and realize that they need to work with the wizards like Harry, Hermione, and Ron to stop this ultimate force. The Avengers' powers would be a new and strange thing in the Harry Potter world, and the wizards' magic would be equally fascinating to the Avengers.
In some fanfictions, Harry Potter might be depicted as having a connection to the concept of the God of Death. Fanfic authors often take creative liberties and might weave such extraordinary ideas into their stories. However, this is not part of the original canon of the Harry Potter series.
One possibility could be that Harry uses his mastery over death to bring back some fallen Avengers. He might use his knowledge of powerful magic to enhance the Avengers' abilities. For example, he could place protective spells on them similar to the ones used in Hogwarts.
Well, it could be really wild. Maybe Harry Potter would use his magic in the world of the Avengers. He might teach Doctor Strange some new spells or have a magical duel with Thor. It would be a crazy mix of two very different universes.
The Death God can be a villain. It might seek to disrupt the natural order of life and death in the wizarding world, causing chaos. For example, it could start bringing back dark wizards from the dead to serve it.
The concept could work by having Harry bring the magic of the wizarding world into the Avengers' realm. His knowledge of potions could be used to create elixirs that give the Avengers new abilities. He could also use his wand to control the elements, like Thor does with his hammer, but in a more magical way. This would make him a valuable and almost god - like addition to the team.
The characters' interactions could be really complex. Hermione would be eager to study the Avengers and their powers from a scientific and magical perspective. She might try to find parallels between magic spells and the Avengers' abilities. Captain America would respect the values of the wizarding world like loyalty and courage which are similar to his own. The Master of Death could play a role in bringing out the best in both groups. He could encourage Harry Potter to be more bold in his actions like the Avengers, and also teach the Avengers about the subtleties of magic. For instance, how a simple spell can have a profound impact on the world around them.
They can be blended by having crossovers of characters. Imagine Harry Potter characters being resurrected in the Avengers universe. Harry could use his magic skills to help the Avengers in their battles. Or an Avenger could be sent to the Harry Potter world after a near - death experience and learn about their magic and how it relates to life after death. They could then bring back that knowledge to their own universe and apply it in a different way, like using it to bring back a fallen teammate in a more magical way rather than just through science - based means.
The team dynamics would change significantly. Harry has a very different background from the Avengers. He grew up in a magical world, and his values are shaped by that. He might introduce a more ethical approach to using power. For example, the Avengers sometimes use brute force, but Harry might advocate for more subtle magical solutions. He could also form unique friendships. Maybe he and Thor would bond over their experiences with powerful artifacts (the Deathly Hallows and Mjolnir).