Harry Potter himself could be a potential Avatar of Death. Given his connection to Voldemort and all the death and sacrifice he has witnessed, he might develop some sort of connection to death in a more profound way. It would be a very dark and different take on his character, but it could also add a whole new layer of depth.
Another aspect could be the character development. If a character becomes an Avatar of Death, it would change their personality and motives completely. They might start seeing life and death in a very different way, perhaps even challenging the moral and ethical boundaries that are so important in the Harry Potter series. For instance, they could question the value of sacrificing oneself for the greater good when they have a new perspective on death.
Often, it might be that Harry has a series of encounters or quests that lead him to connect deeply with the concept of death and thus evolve into the avatar. This could involve facing deathly challenges, understanding the afterlife, or mastering forbidden spells related to death.
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.
The story could develop in many ways. Harry might use his connection to death to access the spirit world in the Avatar universe more easily than others. This could lead to him discovering secrets about the origin of bending or the history of the Avatar. He could also use his Gryffindor courage to stand up against any form of oppression in the Avatar world. His skills in magic, combined with his new - found knowledge of the Avatar world, could make him a powerful force for good or, if misused, a great danger. As he interacts with the different nations and characters, he'd slowly change the dynamics of the Avatar world, all while dealing with his own identity as the master of death.
The theme of adventure is also very prevalent. Characters embark on quests in the unfamiliar Avatar world, facing new challenges like the dangerous creatures there. They might also have to use their knowledge of magic in ways they never thought of before. And there's often a theme of self - discovery. As the characters adapt to the new world, they learn more about themselves and their own powers.
One common theme is the exploration of different magic systems. Since both universes have their own unique magic, fanfictions often play with how they can interact or be combined.
Yes, there are likely fanfictions out there with this concept. The 'Harry Potter' fandom is vast and creative, and many fans like to explore unique and alternative storylines. Some might imagine Harry having a special connection to the idea of 'Lord Death' in a fan - created narrative.
One way to combine them creatively is by having an Avatar character attend Hogwarts. Imagine an Airbender learning magic, using their airbending skills to enhance their spell - casting, like using air currents to direct a spell more accurately. Another idea could be a crossover where the Avatar world's spirits interact with the magical creatures in the Harry Potter universe. For example, a Patronus could be seen as a form of spirit energy, and perhaps there could be some kind of connection or interaction between them.
One unique element is the combination of magic systems. In 'Harry Potter the Last Avatar' fanfiction, we can see how spells from Harry Potter and bending from Avatar can co - exist. For example, a character might use the Avada Kedavra spell while another bends water to defend against it.