One interesting plot could be that the Na'vi discover the wizarding world. They might be intrigued by magic and the Hogwarts castle. Maybe some Na'vi students could be sent to Hogwarts to learn magic, and they'd bring their own unique skills like their connection with nature and flying on their banshees. This would create a whole new dynamic in the Hogwarts classrooms and grounds.
In a crossover fanfiction, the Sorting Hat could end up on Pandora. The Na'vi are confused by this strange object. One of the Na'vi tries it on and it sorts the Na'vi into Hogwarts houses based on their characteristics. This could lead to some Na'vi being selected to study at Hogwarts, and they bring their own unique skills and knowledge of Pandora's magic, which causes quite a stir among the students and faculty at Hogwarts.
The wizards' magic could also have an impact on the Avatar world. Maybe the wizards could use their spell - casting abilities to help the Na'vi in some technological aspects. For instance, they could use magic to repair or improve some of the Na'vi's tools or weapons. At the same time, the Na'vi's magic, which is deeply rooted in their spiritual connection to Pandora, could teach the wizards new ways of looking at magic. The wizards, who often rely on written spells and magic wands, could learn from the Na'vi's more instinctive and nature - connected magic.
One intriguing combination would be Hermione and Neytiri. Hermione's thirst for knowledge and Neytiri's connection to Pandora's nature could lead to some great interactions. Hermione could learn from Neytiri about the unique flora and fauna of Pandora, and Neytiri could be fascinated by Hermione's magic and her ability to study and understand complex things.
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.
One idea could be that the Avatar characters gain the ability to use magic when they enter the Harry Potter world. For example, Aang could use his airbending skills along with magic spells to fight against the Death Eaters. Another could be that Hogwarts students are sent to the Avatar world for a special exchange program, and they have to learn to bend elements instead of casting spells.
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, in some fanfiction, Harry could be reimagined as the Avatar. Fanfiction often takes characters from different universes and combines them in unique ways.
I think Sokka and Ron would make a great pair. Sokka has his unique sense of humor and strategic thinking, and Ron is loyal and has his own brand of humor. They could get into all sorts of comical and adventurous situations together. Also, Zuko and Draco Malfoy could be an interesting pair. Zuko has his redemption arc, and Draco could potentially learn from Zuko's journey to become a better person.