Well, a really interesting plot could be that Sirius, as a girl, discovers new magical abilities or a different connection to magic. Since she has changed physically, perhaps there are also changes in her magical essence. This could lead her on a journey to understand this new aspect of herself. She might also get involved in a love triangle that was not possible before. For instance, she could be pursued by a male character who was previously just a friend and also have feelings for another female character, creating a complex web of relationships.
A plot could revolve around Sirius's transformation into a girl affecting her family dynamics. The Black family might have an even more extreme reaction than they did before. She could be forced to deal with new family pressures or, on the flip side, find unexpected support from some family members. In the magical community at large, she might also become an unexpected symbol for gender - fluidity or transformation magic, leading to both positive and negative attention.
One plot idea could be Sirius, as a girl, having to navigate the wizarding world's gender - based expectations. For example, she might face different treatment in Hogwarts classes or from other students. Another could be her relationship with her friends, like how James and Remus react to this change. Maybe they initially struggle to adjust but then come to accept her fully. Also, her interactions with the female characters could be explored, such as forming new friendships or rivalries with girls in her year.
A possible plot is that Shirou as a girl gets caught up in a romantic sub - plot that was not possible before. For example, she might be the object of affection for a character who previously only saw her as a friend when she was male. Also, she could struggle with her identity, trying to hold on to the values she had as Shirou while adapting to her new physical form. This internal conflict could drive the story forward.
One idea could be Izaya, as a girl, using her charm to manipulate situations in a different way than before. She might be underestimated at first because of her new female form, but then shock everyone with her still - sharp intellect.
One plot idea could be that Ben turns into a girl and has to deal with the different social expectations. For example, his friends might treat him/her differently at first. Another could be that the Omnitrix malfunctions further and only allows female forms, so Ben has to learn to master these new forms in battle. Maybe there could also be a story where Ben as a girl gets caught up in a situation where only a girl can save the day, like infiltrating an all - female villain group.
One plot idea could be that Thor, as a girl, has to navigate the male - dominated Asgardian society in a new way. She might face different expectations and challenges, like having to prove herself in combat even more so because of her new form. Another could be that Thor's relationships change. For example, his friends might be a bit confused at first but then learn to accept and support this new version of him. And perhaps she discovers new powers or a different connection to magic that was hidden before.
A really interesting plot could be that Draco's transformation into a girl is part of a bigger magical mystery. She starts to notice strange things happening around Hogwarts that seem related to her change. As she tries to figure out what's going on, she teams up with unlikely allies from different houses. Along the way, she also has to deal with the prejudice and confusion from some of the wizarding community who don't understand or accept her new identity.
One idea could be that as a girl, Timmy experiences the world from a different perspective. For example, he might have to deal with the way girls are treated in school, like different expectations in sports or academics. Maybe he discovers that girls have a different kind of friendship dynamic and has to navigate that. Another plot could be that he has to find a way to turn back into a boy and in the process, learns a lot about himself and the differences between the two genders.
One idea could be that as a girl, Voldemort has to deal with the sudden change in how people perceive her. Wizards who were once afraid of the male Voldemort now underestimate her, which she uses to her advantage to secretly gather power again. Another plot could involve her exploring new emotions that come with the female form, like a different kind of vulnerability, which she initially hates but then learns to use in a manipulative way.
One idea could be that as a girl, Midoriya has to face different social challenges within the hero academy. For example, she might encounter more discrimination in a male - dominated field. Another could be that her relationships with her male friends, like Bakugo, change in unexpected ways. Maybe Bakugo is more protective or more competitive in a different sense.
One idea could be Sasuke, as a girl, having to deal with different social interactions in the ninja world. For example, she might face new forms of discrimination or unexpected kindness. Another plot could involve her love life. Maybe Naruto has a different reaction to her now that she's a girl, and it could lead to a whole new dynamic in their relationship. Also, Sasuke as a girl could struggle with her identity and how it affects her goals of revenge and restoring her clan's honor.
Well, a possible plot could be Arthas, now a girl, embarking on a journey to find a way to reverse the transformation. Along the way, she teams up with other adventurers. She has to constantly battle her own insecurities as well as external threats. Maybe she discovers that this transformation is part of a larger, more mysterious magical plot that she has to unravel.