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.
Another challenge would be keeping up with the ever - evolving dark arts. Harry has had his share of battles, but new threats are always emerging. He would need to constantly study and research to stay ahead, so that he can teach his students the most effective ways to defend themselves. Also, he has to balance his duties as a professor with his own personal life and possible future adventures.
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.
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.
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.
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.
Yes, in many fanfictions, Harry can be an excellent professor. He has his own unique experiences and knowledge, which he can share with his students. His adventures in the wizarding world give him a different perspective from traditional professors, making his classes interesting and inspiring.
He could be a very hands - on professor. Given his past of constantly being in dangerous situations, he would likely teach in a way that emphasizes practical skills. For example, he might teach Defense Against the Dark Arts by actually demonstrating how to fight off dark creatures.