Well, perhaps a plot where Harry wakes up as a girl and discovers new magical abilities that are more commonly associated with female witches. She might then have to learn how to control and use these abilities while also coming to terms with her changed physical form. It could also involve a romantic sub - plot where characters who previously saw Harry as a boy now have different feelings towards her as a girl.
She might be an old friend of Harry's from his childhood in the Muggle world that he didn't know was a witch. She had been suppressing her magic for a long time and fainted when it finally burst out uncontrollably. Harry wakes her up and helps her understand and control her new - found powers.
Perhaps there are challenges from their friends and the wizarding community. Some might be shocked or disapproving of their union. This could lead to them having to defend their relationship and face various social pressures. Maybe they have to work together to prove that their marriage can work despite the unorthodox start.
One possible plot could be that the girl is a fellow student at Hogwarts who has fainted during a dangerous situation, like a duel gone wrong in a secret passage. Harry, being the heroic type, uses a spell to wake her up. Then they end up having to work together to get out of the passage before it closes or some other threat arrives.
Obviously, Harry would be the main character, just in a female form. Hermione would also be a very important character. She could be the one to help Harry understand and navigate the new experiences of being a girl in the wizarding world. Ron might also be there, and his reactions to Harry's transformation could add some interesting dynamics to the story.
One popular 'Harry wakes up married' fanfiction might involve him waking up married to Hermione. In this scenario, they could have been under the influence of a magical spell that made them get married without realizing it. Then they have to deal with the consequences, like telling their friends and trying to figure out if they actually have feelings for each other.
In some stories, a man wakes up as a woman and decides to go on a date. He learns about the different expectations and pressures women face in the dating world. He might notice how he is objectified more as a woman and how people focus more on his appearance rather than his personality at first glance.
One interesting plot could be that as a girl, Harry has to face different social expectations in the wizarding world. For example, in the original story, male and female characters might have different roles in some classes or traditions. As a reincarnated girl, she could break those stereotypes and show that gender doesn't limit one's magical abilities. Maybe she becomes more empathetic in this new form and uses it to her advantage in dealing with her friends and enemies alike.
One possible interesting plot could be how Harry, as a girl, navigates the male - dominated wizarding world. For example, she might face different challenges and prejudices in classes like Defense Against the Dark Arts where physical strength was often emphasized for boys. Another plot could be her relationships with other characters. Maybe Ron would initially be confused about his feelings towards a female Harry, and Hermione could become an even closer friend, sharing different kinds of girl - to - girl moments with her. Also, how she would deal with Voldemort as a girl might be unique. Would Voldemort underestimate her because she's a girl? These are all aspects that could make for an interesting fanfic plot.
Well, in the fanfic, Harry as a girl might have a different experience with the sorting hat. Instead of being sorted into Gryffindor easily like before, the sorting hat could consider her new personality traits due to the gender change. She might even end up in a different house, which would completely change her Hogwarts experience. And her interactions with the other houses' students would be very different too.
Well, perhaps they could start the day with a friendly chat over breakfast. Harry might share some of his wizarding world stories with Gabrielle, and she could be really fascinated by them.