Well, in some of these fanfictions, Harry might introduce new magical courses at Hogwarts. For example, he could start a course on ancient magical beasts that are not well - known. This would add a whole new dimension to the students' learning experience.
One plot could be that Harry as headmaster focuses on improving the relations between different houses. He might organize more inter - house activities like a grand magical tournament where students from all houses have to team up. This would break the traditional rivalries and create a more united Hogwarts.
In certain fanfictions, Harry as headmaster might face a threat from an old dark magic that has been dormant for ages. He then has to use his unique experiences and knowledge to not only protect the school but also find a way to permanently vanquish this new threat. He might seek help from old friends and even some former enemies turned allies.
Perhaps a plot where the headmaster has to deal with a dark threat that is specifically targeting the school in a very different way than Voldemort did. This could involve some ancient magic being misused, and the headmaster has to use his or her wisdom and power to counter it while also protecting the students.
Well, in some 'Harry is headmaster fanfic', there could be plots where Harry reforms the Hogwarts curriculum. He might introduce new magical subjects that were previously overlooked, like advanced Muggle Studies to improve the understanding between the wizarding and Muggle worlds.
One interesting plot could be Harry dealing with the politics within Hogwarts as headmaster. He might have to face challenges from traditionalist teachers who oppose his more progressive ideas. For example, he could try to introduce new magical subjects that focus on Muggle - wizard relations, which would stir up a lot of debate among the staff and students.
Well, perhaps a plotline where Harry has to deal with a new dark threat that is targeting Hogwarts specifically. As headmaster, he would use his knowledge of the Dark Arts and his friends' expertise to protect the school. He could also start new traditions at Hogwarts to boost the morale of students and staff alike.
One idea could be a fanfiction where the headmaster has to deal with a new, mysterious dark magic that is affecting the students' dreams. Another could be about a headmaster from a different wizarding school coming to Hogwarts for an exchange program and the chaos that ensues. Or perhaps a story where the headmaster discovers a long - lost spell in the Hogwarts library and has to decide what to do with it.
A popular choice could be a character like Sirius Black. If he had survived, he could have become headmaster with his rebellious yet caring nature. He would bring a different kind of leadership to Hogwarts, one that is more in tune with the students' desires for change and adventure.
A great plot could be that Harry decides to open Hogwarts to students from all over the world in a more inclusive way. However, this causes some cultural clashes among the students and staff. He has to find a way to make everyone feel welcome and at the same time maintain the school's traditions. Also, there could be a plot where a mysterious prophecy about Hogwarts is revealed, and Harry as headmaster has to figure out how to prevent its doom.
In my opinion, Dumbledore would still be a great headmaster in fanfiction. His wisdom and experience are invaluable. He always had a deep understanding of the students and was able to guide them through difficult times. He also had a great sense of humor and was very approachable despite his great power.
Another challenge would be handling the different houses. Each house has its own identity and sometimes rivalries can get out of hand. A new headmaster would need to find ways to promote unity among the houses, like through new inter - house competitions or joint projects.
One popular 'Harry is headmaster' fanfiction could be 'Harry Potter: The Headmaster's Era'. In this, Harry might bring new teaching methods and a fresh perspective to Hogwarts. Another could be 'Harry's Headmastership: A New Dawn' which perhaps focuses on his relationships with the students and staff as he takes on the role. There could also be a fanfiction that delves into how Harry overcomes the challenges of being headmaster while still dealing with his own past traumas.