The plot could also involve Ed using her new - found female identity to her advantage in some situations. For example, in a world where people might underestimate a girl in alchemy, she could surprise them with her skills. Or she could use her femininity to gain access to certain places or information that were previously unavailable to her as a boy. This could create all sorts of interesting twists and turns in the story as she navigates the world of alchemy with this secret identity.
One idea could be that as a girl secretly, Ed Elric might face different challenges in the male - dominated alchemist world. Maybe she has to hide her true identity while trying to achieve her alchemical goals.
One idea could be that Ed has to keep her true gender a secret while on her alchemic adventures to avoid discrimination in a male - dominated alchemic world. Another could be that she forms unique relationships with other characters who might suspect or eventually discover her secret.
Alphonse could be a major supporting character. Since he is Ed's brother, he would be in a unique position to either help her keep the secret or accidentally almost expose it. Winry could also be important. She might be someone Ed could confide in or struggle to keep the secret from, especially if their relationship takes on new dimensions due to Ed's secret gender.
The plot could start with some small hints that Luffy is a girl, like when she has to deal with certain situations that are more related to female physiology in private. As the story progresses, her secret might be gradually revealed to some of her closer crewmates.
Perhaps a jealous rival. This person might be a male who is threatened by Ed's success or popularity. When they discover Ed is a girl, they could use this secret to try and drive her out of the group or community she's in. They might spread rumors or create problems for her.
The plot could involve Gaara trying to hide her gender while still being a powerful shinobi. Maybe she has to constantly worry about being discovered during battles or in interactions with other ninja. For instance, she might have to come up with excuses for not sharing certain spaces with male ninja.
Well, perhaps the plot could involve Bilbo hiding her true gender identity in a world where being a girl might bring unexpected challenges or opportunities. Maybe she has to keep it a secret to be able to go on adventures like the male hobbits do. She could be constantly worried about being discovered while also having to deal with her own self - discovery and acceptance of her femininity.
In a 'lelouch is secretly a girl' fanfic, the plot could involve Lelouch's struggle with her identity. She may have been raised as a boy for strategic reasons. As she grows older, she starts to question her own identity. Meanwhile, her actions in the political and military arenas are constantly under scrutiny. When her secret is on the verge of being exposed, she has to make difficult decisions about who she really is and what she stands for. This could lead to a re - evaluation of all her relationships and her place in the world she has been fighting in.
The plot could involve Levi's past. Maybe she was forced to hide her gender to survive in a harsh environment. In the fanfic, she could gradually form a close bond with a particular character who starts to suspect something is different about her. This could lead to a conflict between her desire to keep the secret and her growing feelings for this character.
One possible plot could be that Edward, now as a girl, has to deal with the different reactions of his friends. For example, Alphonse might be a bit confused at first but quickly adapts and becomes very protective. Edward could also face new challenges in his alchemical studies as some traditional alchemy is male - dominated. And he might have to struggle with his own self - identity, trying to figure out if he still has the same goals and values as before the transformation.