A 'Harry Potter cupboard fanfic' could be about many things. It might focus on Harry's time living in the cupboard under the stairs at the Dursleys'. It could explore his thoughts, feelings, and experiences during that difficult time in a more in - depth way than the original books. Maybe it details how he coped with the loneliness and neglect, and perhaps even some magical things that happened right there in the cupboard that were never mentioned in the official story.
There are quite a few fanfic stories out there that might involve Harry's cupboard. However, it's hard to say which ones are the most popular specifically about the cupboard. Some popular fanfic platforms like Fanfiction.net or Archive of Our Own might have some great ones. You can search using keywords like 'Harry Potter' and 'cupboard' to find them.
Hermione would probably be very interested in the modified cupboard. She might study how Harry used his magic to make the modifications and offer some suggestions to improve it, like adding a spell - based locking mechanism that only responds to certain magical phrases.
Well, perhaps in this fanfic, Harry Potter uses his magic to transform the cupboard into a magical portal. He could make it lead to different magical places he's always wanted to explore secretly, like a hidden library filled with ancient spells.
A really cool 'Harry Potter cupboard' fanfiction could revolve around Harry using magic to transform the cupboard into a magical sanctuary. He uses his skills to make it a place where he can practice magic in secret, away from the prying eyes of the Dursleys. He decorates it with floating candles and shelves filled with ancient wizarding texts he manages to find.
It could be a storage for ancient and dark artifacts. A group of dark wizards are after these artifacts stored in the cupboard, and Harry has to protect it. This could lead to an epic battle between Harry and the dark wizards right in his old home in Privet Drive.
A fanfiction could involve the cupboard being a time - travel device. Harry accidentally activates it and is sent back in time to when his parents were at Hogwarts. He gets to see them in their youth, and through his interactions, he changes some small events that have a big impact on his present life.
One interesting fanfiction could be about Harry finding a hidden magical object in the cupboard that changes his early years at the Dursleys. Maybe it's a charmed key that unlocks a portal to a mini - wizarding world where he can practice magic secretly and gain confidence before going to Hogwarts.
They're popular because it's a really iconic and relatable setting. The cupboard under the stairs represents Harry's oppression and isolation at the Dursleys. Fanfiction writers can explore his emotions and experiences during that time in great detail, which many readers find fascinating.
There's a chance that he'll meet some sort of magical creature that has made the cupboard its home. This could be a friendly creature that helps him get out or a more mischievous one that makes his situation even more difficult. He'll have to use his wits and magic skills to deal with it.