Hermione Granger could also be a main character. Her intelligence would be very useful in any situation in The Hogs Head. Maybe she's researching some rare magical texts that can only be found in the vicinity of the pub or she's using her logical thinking to solve mysteries related to the place.
One interesting storyline could be about the secret meetings that take place in The Hogs Head. Maybe characters are plotting against the dark forces in a more covert way compared to what we see in the original books. It could add a new layer of mystery and danger to the wizarding world.
One great fanfic could be about the Head of Gryffindor dealing with a difficult student. Maybe the student has been caught cheating on an exam. The Head of Gryffindor, in this fic, might have to decide between strict punishment and a more lenient approach to help the student learn from their mistake.
One great 'Harry Potter Head of House fanfic' could be one where McGonagall has to deal with a new kind of magical threat within Hogwarts. It might show her using her wisdom and strictness to protect the students. Another could focus on Snape as the Head of Slytherin, delving deeper into his complex character and how he manages the Slytherin students with his own brand of tough love.
Character relationships play a huge part in a great 'Harry Potter Head of House fanfic'. If it's about a Head of House interacting with their students, it should show a range of emotions and reactions. For instance, a strict Head like Umbridge (if she were in a different fanfic scenario as a Head) would create a very tense and interesting dynamic. The setting should also be well - described. We need to feel like we're really in Hogwarts, whether it's in the common rooms or the classrooms. The fanfic should also add something new to the 'Harry Potter' universe, like a new magical creature or spell that the Head of House discovers or uses.
Obviously, the Head Boy himself is a very popular character. He is often depicted as strong - willed, intelligent, and with a sense of justice. Harry Potter might also be a popular character as he could interact with the Head Boy in various ways, like giving advice or getting involved in some adventures together.
One interesting 'Harry Potter head injury fanfic' could be about Harry getting a head injury during a Quidditch match. Maybe he has some strange visions afterwards that lead him to discover a hidden mystery in Hogwarts. Another could involve Hermione getting a head injury while in the library due to a falling bookcase, and then she starts to have a different perspective on magic theory. There could also be a fanfic where Ron gets a head injury from a stray spell in the Gryffindor common room and it makes him temporarily forget all about food, which is quite a strange situation for him.
Well, one interesting plot could be the Head Boy having to deal with a new dark magic threat within the school that the teachers are unaware of. He has to secretly gather allies among the students to fight it.
A plot could be the Head of Gryffindor having to deal with a rivalry between Gryffindor and Slytherin that gets out of hand. They would need to find a way to calm the students down and promote unity among the houses.
Well, Harry as Head Boy would be in a position of more responsibility. Dumbledore would probably treat him with a new level of respect. He might start to involve Harry in more decision - making processes regarding the safety and future of Hogwarts. Harry, in turn, would look up to Dumbledore even more, seeing him as not just a mentor but also as a colleague in a way. They could have more in - depth discussions about the wizarding world's politics and how Hogwarts fits into it all.