Obviously, Harry himself would be one of the main teachers. He could teach Defense Against the Dark Arts. Hermione would also be a great teacher. She could teach Transfiguration as she was excellent at it. Ron might teach something like Care of Magical Creatures. He has a lot of experience with magical creatures from their adventures.
Well, it could include advanced magic like time - turning spells. After all, Harry has had his own experiences with time - travel, so he might want to teach students how to use it safely. Also, there could be a course on magical creature care, especially for those dangerous ones like the Thestrals, which he's quite familiar with.
He could meet a brilliant but eccentric teacher. This teacher might be an expert in a very rare branch of magic that Harry has never heard of before. The teacher could take Harry under their wing and teach him things that Dumbledore or the other Hogwarts teachers never did.
Well, one possibility is that Harry Potter builds the school in a hidden location, away from the prying eyes of the Ministry of Magic. He might create a curriculum that focuses on both traditional magic and new, unique areas of study that he discovered during his adventures.
Obviously, Harry Potter himself would be one of the main teachers. He could teach Defense Against the Dark Arts, given his vast experience in that area. Hermione would be a great fit for teaching Transfiguration or History of Magic, as she has a deep knowledge of both.
Well, he might make new friends. In a new school, Harry would be exposed to different students and personalities. He could meet a group of outcasts who are actually really powerful in magic but are shunned for some reason. They might form a secret club together to practice unique spells.
Perhaps he barters with magical beings. He could offer his services in solving magical problems for them in exchange for rare building resources. For example, he might help a group of centaurs with a prophecy issue and in return, they give him enchanted wood or special stones. He may also get help from his friends who have access to different resources. Hermione might provide some rare books with building spells, and Ron could get some things from his family's old collection.
One possible plot could be that Harry Potter decides to open his own school to teach a new generation of witches and wizards in a more inclusive and modern way. He might incorporate Muggle - friendly elements into the curriculum, like teaching about Muggle technology from a magical perspective. He could also focus on teaching students how to use magic for good in the real - world situations that the wizarding world now faces, such as dealing with dark magic that is becoming more complex and hidden.
In fanfiction, Harry Potter might create his own magic through intense study of ancient and forgotten magical texts. He could discover long - lost incantations and then modify them to suit his needs. Also, his unique connection to Voldemort could play a role. By understanding the dark magic within Voldemort and combining it with the positive magic he's learned, he could create a new form of magic that balances both light and dark elements.
In Harry Potter fanfiction, a character being 'his own man' might mean that he has the independence to make his own choices, regardless of the expectations of others. For example, a character might not follow the typical path set by the original story, like a Slytherin who decides to oppose the pure - blood supremacist views of his family.