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.
One common theme is the redemption of Severus Snape. Many fanfictions explore his character in a more sympathetic light, showing his inner turmoil and the reasons behind his actions. Another theme could be the rivalry between different potions teachers or their relationships with other Hogwarts faculty.
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.
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 some fanfiction, the pot brownies could be part of a prank by the Weasley twins. They create these special brownies and leave them in places where they know certain Slytherins will find them. The Slytherins then start acting out of character, like Draco Malfoy suddenly being nice to Hagrid. This causes a stir in the school and the twins have to figure out how to reverse the effects before they get into too much trouble.
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.
In fanfiction, 'pot brownies' can be a creative way to introduce a new type of magic or mischief. It could be a magical item that has different effects on wizards and witches. For example, it might enhance their existing magical powers in unexpected ways.
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.
Flitwick might be quite intrigued. He loves magic in all its forms and fanfiction would show him new and different ways magic could be used in the Harry Potter world. He'd be interested in the creative spells and concepts that the fans come up with.