Well, it could be really strange. Maybe he'd be super confused by the whole Groundhog Day - like repetition in the fanfic world. He might try to use his magic to break free from the odd cycle or situation he's in.
Well, it could be a side - effect of a powerful time - turning charm. In the wizarding world, time - related magic is extremely complex. If Harry was involved in an experiment or was caught in the crossfire of a time - magic battle, it might have led to him getting stuck in Groundhog Day. Also, it could be a plot by Voldemort or his followers. They might have found a way to trap Harry in this loop to stop him from fulfilling his destiny. They could have used some dark magic combined with a knowledge of Muggle concepts like Groundhog Day to create this strange situation.
Well, Hermione would be the first to take action. She'd be using her extensive knowledge of magic to try and find a solution. She might even come up with some complex spells or potions to try and break the loop. Ron would be a bit more laid - back, but still worried. He'd be there for Harry, listening to him talk about his experiences in the loop each time. Luna would have some really interesting and out - of - the - box ideas. She might suggest things like looking for invisible time - bending creatures or using her own unique brand of magic to disrupt the loop. His friends would all come together, each bringing their own strengths, to try and get Harry out of this strange situation.
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.
I'm not aware of any such fanfic. Fanfiction often contains a wide variety of strange and inappropriate concepts, but this one seems rather extreme and goes against the nature of the original Harry Potter story in terms of the characters' relationships.
As a girl, Harry might be more cautious in some situations. In the original story, Harry was often quite bold and impulsive. But now, she might think twice before jumping into dangerous situations. Also, her relationships will shape her differently. She may be more nurturing towards her friends, and this could change the group dynamic. For instance, instead of leading the charge all the time, she could be more of a behind - the - scenes organizer, using her new - found femininity to bring the group together in different ways.
In a fanfic where Harry Potter gets a lawyer, it could lead to some really interesting plot developments. Maybe the lawyer helps him deal with the legal mess left by the Ministry of Magic's previous actions against him. For example, clearing his name regarding the false accusations of being a dark wizard or dealing with property rights issues related to his family's estate at Godric's Hollow.
It's inappropriate because it takes a beloved and well - established fictional world and character and twists it into something completely untrue to its essence. Harry Potter is about magic and heroism, not such adult - themed and out - of - place ideas.