Perhaps Harry becomes a professor of Transfiguration. He could introduce new spells and techniques he learned during his adventures. Since he was so good at it during his school days, he would be able to pass on his knowledge and also inspire students to be creative with their transfigurations. He might even have a special project where students try to transfigure something really complex, like a whole building, which he guides them through step by step.
In this fanfiction, Harry could be a professor of Muggle Studies. He has a unique perspective as he grew up in the Muggle world. He could teach students about Muggle technology, culture, and how Muggles live without magic. He might organize field trips to Muggle places, like a museum or a cinema, to give students a hands - on experience of the Muggle world. This would not only expand their knowledge but also promote better understanding between the wizarding and Muggle worlds.
One possible plot could be that Harry, after all his adventures, decides to return to Hogwarts to share his knowledge. He starts as an assistant professor, perhaps in Defense Against the Dark Arts. He uses his real - life experiences to make the classes exciting and relevant. His students look up to him, and he has to deal with some of the traditional Hogwarts politics among the staff.
Ron could also be there. Maybe he's the keeper of the Gryffindor Quidditch team still, but also helps out with some practical magic lessons. He could teach students about the magical creatures he encountered during his travels, like how to handle a Hippogriff properly. He and Harry would often joke around in the staff room, reminiscing about their school days.
Harry could also be a great Quidditch coach. He was an excellent Quidditch player himself. He would be able to train students in the skills of flying, teamwork, and strategy. He could pass on his love for the sport and perhaps even lead the school team to many victories. He would know how to spot potential in young players and help them develop their talents.
Perhaps Harry would try to make the DADA classroom a more inclusive and safe space. He had faced so much discrimination and danger himself when he was a student. So he would ensure that no student, whether they are Muggle - born or pure - blood, would feel left out or threatened in his class. He could also use his Gryffindor courage to inspire students to stand up against any form of dark arts or bullying.
Well, he might bring some major changes to Hogwarts. For example, he could reform the school rules to be more fair for all students, especially those from different houses. He might also use his new position to better protect the school from dark forces. Maybe he would start new magical studies programs that were previously overlooked.
Naruto might be a great professor for a class on the study of magical creatures. His curiosity and ability to befriend all kinds of beings in his own world could translate well. He could teach students how to approach magical creatures with respect and understanding, just as he did with the giant toads and other beasts in his ninja journey.
One possible plot is that as the heir of Hogwarts, Harry has some special powers or abilities that he gradually uncovers. He might be able to communicate with the very essence of the school, like the walls and the grounds, and they guide him in his fight against the forces of evil. For example, the castle could show him hidden passages to outwit Voldemort's minions. Also, other characters might react differently to him once they learn of his new status. Some might be jealous, while others would look to him for leadership.
Well, if Percy Jackson were a professor at Hogwarts, there would be a lot of chaos. He'd probably teach a water - based magic class, using his skills with water. He might get into trouble with the other professors for his unorthodox methods. For example, instead of using wands for some spells, he'd use his powers over water. His students would be in for a wild ride as he'd take them on adventures around the Hogwarts grounds, using the lakes and fountains for practical lessons.
Hermione would surely be there. She might be a fellow professor, teaching a subject like Transfiguration or Ancient Runes. She could be Harry's confidante and help him with academic matters at Hogwarts. Also, Ron could make an appearance, perhaps as a visiting lecturer from time to time, sharing his knowledge of wizarding chess and other aspects of wizard culture.
The story could start with Harry having a near - death experience where a Dementor's kiss was almost upon him. Instead of being terrified, he becomes oddly fascinated. He begins to research their origin, their connection to Azkaban, and their role in the wizarding world. As he does this, he discovers some ancient magic related to Dementors that no one else knew. This knowledge could either lead him down a dark path or help him to change the way Dementors are perceived in the wizarding community.