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.
One possible fanfiction idea could be Harry Potter, after becoming the Master of Death, somehow gets transported to the Dragon Age world. He might use his knowledge of magic and his new - found mastery over death to change the course of events in the Dragon Age. For example, he could use the Deathly Hallows in ways that are unheard of in the Dragon Age, like using the Resurrection Stone to bring back important characters who died prematurely in the Dragon Age lore.
It could be an epic crossover. Harry, with his mastery over death, might bring some unique magic to the Avengers. Maybe he could use his skills to revive fallen heroes or protect the world in a different way than the Avengers are used to.
One possibility could be that Harry uses his mastery of death to communicate with the spirits in the Avatar world, similar to how he could interact with the dead in the Potterverse. He might gain new powers related to the elements, as his connection to death gives him a deeper understanding of the balance in nature, which is crucial in the Avatar world.
In a fanfiction, the Master of Death could be a sort of bridge between the two universes. The Avengers, with their superpowers, might be initially bewildered by magic. But with the help of Harry Potter and the power of the Master of Death, they could start to understand and use magic in unique ways. For example, Thor's hammer could be enchanted with new spells by the wizards. And the characters from Harry Potter could learn about teamwork from the Avengers.
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.
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).
It could work if the Infinity Stones and the Deathly Hallows had some sort of connection. Since Harry is the Master of Death, he might be sensitive to the power of the Stones. The Avengers are dealing with the Stones' power, and Harry could bring his knowledge of dealing with powerful magical artifacts from his world. He could teach the Avengers about the consequences of misusing powerful items and how to safeguard against the corrupting influence of such power.
Well, in such a fanfiction, Harry Potter being the Master of Death would have some really interesting interactions with the Avengers. Imagine Iron Man being intrigued by Harry's magic and trying to figure out how to incorporate it into his suits. Harry, on the other hand, might be a bit overwhelmed by the high - tech world of the Avengers at first but would soon find ways to use his magic in combat alongside the superheroes. The Hulk could be a bit of a wild card, and Harry might need to use some calming spells around him.
The fanfiction could show Harry using his skills as the Master of Death to resurrect certain key characters in the Avengers universe who have died. This would change the power dynamics and relationships within the team. He could also use his magic to teleport the Avengers to different locations quickly, which is something that could be very useful in their fight against powerful enemies. Also, his understanding of the Deathly Hallows could lead to some interesting plot twists where the Avengers have to help him protect these powerful artifacts from falling into the wrong hands.
One possible fanfiction could be where Harry, as the Master of Death, has a secret connection with Daphne. Maybe Daphne discovers Harry's true power and they form an alliance to fight the remaining dark forces in the wizarding world. They could go on adventures together, using Harry's new - found status to bring about a new era of peace and magic.