Well, in such a fanfiction, a possible plot is that Naruto, now a girl, discovers new aspects of her chakra control. Since female bodies might have different energy flows, she could explore new jutsu or ways of using her existing skills. Also, there could be a romantic plot where some of the male characters start to see her in a different light, which would create a whole new dynamic in the story.
One interesting plot could be Naruto, as a girl, having to deal with the different expectations of the ninja world towards females. For example, she might face challenges in being taken seriously in combat training at first. Another plot could involve Naruto's friends' reactions. Some might be really confused, while others could quickly accept and support 'her'.
Well, perhaps there could be a plot where Percy, as a girl, has to form new relationships. She might have a different dynamic with her male friends now that she's a girl. And there could be a story arc about her coming to terms with her new identity. Maybe she discovers new aspects of herself that were hidden when she was a boy. Also, it could be interesting if she uses her new form to her advantage in some situations, like fooling her enemies who are used to dealing with the male Percy.
Another plot could involve Harry's friends' reactions. Some might be very accepting and helpful, while others could be confused or even act differently towards 'her'. This could lead to some interesting character development and story arcs for both Harry and his friends.
In some 'izuku gets turned into a girl fanfiction', a great plot is her struggle with self - identity. She has been a boy all her life and suddenly being a girl is a huge change. She might question her place in the hero world, whether she can still be as strong and respected. And the story could explore how she overcomes this internal conflict, perhaps with the help of her friends. At the same time, her appearance change could also lead to some comical situations, like when her old friends first see her new form and their shocked reactions.
Well, one interesting plot could be that all his friends have to take care of him. They might struggle to train him as they did before because he's just a baby. Another could be that his enemies don't recognize him at first and underestimate the baby Naruto, but then he still shows some of his ninja skills in a very cute and unexpected way.
One possible plot could be Stiles' struggle to adapt to his new female body. He might have to deal with different social expectations and how his friends react to his new appearance. Another plot could involve Stiles trying to find a way to turn back into his male self while facing various challenges along the way.
In some 'naruto turned into a girl fanfic', a cool plot is that she might have to disguise herself as a boy again at times. This could lead to some really funny and tense situations. Also, she could form new relationships with female characters in a different way. For instance, she might bond more closely with Sakura over 'girl - talk' type of things while still having the bond of being a ninja together.
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.
In some fanfictions, a possible plot could be that Stiles, as a kid, has a different perspective on the supernatural world around him. He might not be as afraid as he was when he was older. For example, he could befriend a supernatural creature that the older Stiles would have been more cautious about. This new friendship could lead to new alliances for the pack. Also, his family's reaction to his sudden transformation could be explored. His dad might be really confused and worried, while his friends are trying to keep it a secret from the wrong people in town.
Another plot could involve Naruto's relationships. As a female, her friendships with characters like Sakura and Ino might change. They could bond over more 'female - centric' things while still being ninjas. Also, her relationship with Sasuke could take on a different dynamic. Maybe there would be more of a romantic tension from the start, and she would have to navigate those feelings while still trying to bring Sasuke back to the village.
One interesting plot could be that the other Avengers have to take care of baby Peter. They struggle with things like changing diapers and feeding him, all while trying to figure out how to turn him back. It would be really funny to see tough heroes like Thor or Iron Man being clueless about baby care.