Well, perhaps in the fanfiction, Stiles as a girl discovers new aspects of her personality. She could find that she has a different sense of fashion or interests. Also, there might be a romantic sub - plot where she attracts different people than she did as a boy, which could lead to some interesting relationship dynamics.
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 this type of fanfiction, a likely plot is that Stiles - now a girl - has to navigate the world of high school all over again. As a girl, she may face different forms of bullying or acceptance. Maybe she joins a new clique or gets involved in activities that were previously off - limits to her as a boy. She could also use her new perspective to solve mysteries in a different way compared to when she was male.
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.
One possible plot could be that Stiles gets rejected by his long - time crush, Lydia. After the rejection, he might go into a bit of a self - discovery phase. He could start focusing more on his friendships and his own personal growth, realizing that he doesn't need someone else's approval to be happy.
There might be a jealous friend or acquaintance who feels that Stiles, as a girl, is getting too much attention. This person could then start spreading rumors or causing trouble for Stiles in an attempt to bring her down.
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.
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'.
One possible plot could be that Stiles is turned into a threat against his will, and Chris, in order to protect others, has no choice but to shoot him. Maybe Stiles is possessed by a dark force.
Scott would probably be very protective. He'd feel responsible for taking care of Stiles and making sure he doesn't get into too much trouble. Lydia might be initially shocked but then use her intelligence to try and figure out how to reverse the situation. And Derek, well, he'd probably be a bit annoyed at first but would also end up being one of Stiles' protectors.
One possible plot could be that Theo kidnaps Stiles to use him as a bargaining chip with the pack. Maybe Theo wants something from Scott, like the alpha power or a powerful artifact that the pack has in their possession, and he thinks Stiles is the key to getting it.