One possible plot development is that Harry's friends initially don't recognize him when he's mistaken for a girl. This could lead to some really funny misunderstandings. They might start flirting with him, thinking he's a new girl in school. And Harry has to find a way to reveal his true identity without causing too much chaos among his friends.
One interesting plot could be how Harry, now as a girl, has to deal with the different social dynamics in Hogwarts. For example, she might face different expectations from teachers and peers. Maybe she forms new friendships with female characters in a way that Harry as a boy never did before.
One interesting plot could be Harry having to deal with the different social expectations placed on girls. For example, in the wizarding world, there might be different rules or attitudes towards female students in Hogwarts. He might struggle with how to act in a way that is considered 'appropriate' for a girl while still maintaining his own identity.
Well, a possible plot development is her struggle with identity. Since she has the memories of Harry but is now a girl, she may have an internal conflict. She might wonder if she should still follow the same path as Harry did in the original story. Also, in terms of magic, she could discover new ways of using magic that were perhaps not explored by Harry because of the different way she experiences the magical world as a female. For instance, she could have a special connection with certain female - centric magical creatures or spells that are more attuned to her new gender. And her presence as a girl could inspire other female characters in the wizarding world to be more assertive and strive for more equality in magic education and other aspects.
One interesting plot development could be Severus having to adjust his teaching style at Hogwarts. Since he has adopted Harry, he can't be as harsh as he used to be towards him in class. This would create a new dynamic between them at school. Also, Severus might have to deal with the other teachers' reactions to this new situation.
Well, Harry may show a great deal of adaptability. Since he's used to dealing with strange and difficult situations in the wizarding world, he could quickly start to think of ways to handle being mistaken for a girl. He might start to observe how girls in the fanfic act and try to imitate them to some extent, while also trying to find a way to let his real identity be known when the time is right. He could also use his sense of humor to get through some of the more awkward moments.
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.
In some 'naruto is banished fanfic', one interesting plot could be Naruto finding a new hidden village that accepts him wholeheartedly. He might then train with unique jutsus there and form new alliances.
There could be a new friendship formed between characters that wasn't in the original. Maybe a character overcomes a major fear or achieves a personal goal.
One plot idea could be that in a magical realm where different fictional universes collide, Harry's appearance or some magical mishap makes others think he is Loki. Maybe the characters from the Thor/Loki universe initially treat him as Loki and he has to figure out how to convince them otherwise while also dealing with the chaos that ensues. For example, he could be caught in the middle of a power struggle between Thor and those who believe he is Loki up to no good.
Well, perhaps one interesting development could be Harry exploring the new powers and responsibilities that come with being a lord. He might use his new status to reform the wizarding world in ways he couldn't before as just a student.