Professor McGonagall could be one of them. She is strict but fair and has a lot of knowledge about transfiguration which could be shared with Harry in a more personal way in this fanfiction.
One common theme is mentorship. Teachers often play the role of mentors to Harry in these fanfictions, guiding him in his magical studies and personal growth. Another theme is trust. The relationship between Harry and the teacher is built on trust, as Harry has to trust the teacher's knowledge and intentions. Also, the theme of discovery is present, as Harry discovers new things about magic and himself through the teacher.
One great Harry x Teachers fanfiction is 'A Teacher's Influence'. It explores the unique bond between Harry and a particular teacher in a very heartwarming way. The story delves into how the teacher's guidance helps Harry grow not just as a wizard but also as a person. Another one is 'Lessons Beyond the Classroom' which focuses on a different teacher - Harry relationship. It shows how their interactions outside of normal teaching scenarios shape Harry's understanding of magic and life in general.
One possible plotline could be Harry learning different magical skills from each teacher in the harem. For example, he might learn advanced potions from one teacher and complex defensive spells from another.
Professor Snape is often very popular in such fanfictions. His complex character in the original series gives a lot of room for creative interpretations in fan works. Writers can explore his relationship with Harry in different ways, like having him be more of a mentor figure in ways that were not fully explored in the books.
In Harry Potter fanfiction, some might consider Remus Lupin as a very competent teacher. He has a deep knowledge of Defense Against the Dark Arts and is able to connect with the students on a personal level. He understands their fears and is patient in teaching them complex magic.
A possible fanfiction could be about the interactions between Harry and his potions teachers outside of the classroom. For example, Harry might need extra help with a difficult potion and has to seek out his teacher after hours. This could lead to some interesting conversations and a deeper understanding between them, not just as student - teacher but as individuals with their own stories and struggles.
In Harry Potter teacher fanfiction, Professor Snape is a top pick. Writers like to play with his character, perhaps making him a hero in some alternate universe or exploring his relationship with Lily Potter in more depth. Professor Dumbledore is also quite popular. Fanfictions might explore his early days as a wizard or his secrets that were not fully revealed in the original books. Additionally, Professor Trelawney can be a popular choice. Writers can create stories where her supposed 'nonsense' prophecies actually come true in unexpected ways.
Maybe Hagrid could be one of the teachers. He's good with magical creatures, and he could teach about the ones that are relevant to flying. And McGonagall could teach transformation spells for flying machines.
Change and growth is also a significant theme. The 'lemon' experiences, whether it's a difficult situation or a personal revelation, can lead to the transformation of a teacher. They might start as a strict and unapproachable figure, but after going through some 'lemon - like' events, they become more empathetic and understanding. This shows how the fanfiction uses these elements to explore character development within the 'Harry Potter' framework.