Perhaps in this fanfiction, Inuyasha is cursed by a powerful demon to become a girl. He has to find a way to break the curse while dealing with the new - found social and physical differences. For example, he may have to learn how to dress and act in a way that is expected of a female in his society. This could lead to some comical situations as well as some deep self - discovery moments.
Inuyasha might decide to become a girl in fanfiction to escape the expectations and responsibilities placed on him as a male. As a girl, he could start a new life. He might join a group of female characters and learn about their ways of life. This could include learning about female - only magic or skills. The story could show his journey of self - reinvention and how he overcomes the prejudices and difficulties he faces in his new identity.
Another aspect could be her relationships. As a girl, her friendship with Alyss might develop in a more complex way. They could bond over being female in a male - dominated world, like sharing their experiences of having to work harder to be taken seriously. Also, her relationship with Halt could be interesting. Halt might be even more protective, but also have higher expectations for her to break gender barriers in the ranger world.
One plot idea could be that Inuyasha, as a girl, has to deal with different reactions from the other characters. For example, Miroku might be more hesitant to touch her inappropriately as he used to do sometimes with Inuyasha in his male form. Kagome could be both confused and intrigued, and they might have to re - evaluate their relationship. Another idea is that Inuyasha in female form has different powers or a different way of using her existing powers, which leads to new adventures and challenges in fighting demons.
One idea could be that Sonic, through some magical or scientific accident, is transformed into a baby girl. In the fanfiction, his friends might initially be very confused. For example, Tails could be trying to figure out how to reverse the process while also taking care of Sonic in his new form. Sonic, as a baby girl, could have different abilities or limitations. Maybe she can't run as fast as before but discovers new powers related to cuteness or charm that help the gang in unexpected ways.
One idea could be that Harry discovers a hidden part of the wizarding world where there are 'monster girls'. Maybe he stumbles upon a secret club at Hogwarts. Through his interactions with them, he learns about their unique cultures and magic. This could lead to him wanting to be more involved with their world, perhaps even using his skills to help them with problems they face.
Well, if Inuyasha was a girl, the dynamics of her interactions with other characters would likely change. Her motivations and actions might be driven by different emotions and perspectives.
One idea could be that Sephiroth somehow gets transported to the feudal era of Inuyasha. He might initially be seen as a great threat due to his power. But as the story progresses, he could form an unlikely alliance with Inuyasha and his group against a common enemy, like a powerful demon that is even more menacing than any they've faced before.
A fanfic could explore how Hiccup's transformation into a girl affects his friendships. Astrid might react in a complex way. At first, she could be jealous or confused, but then they could form a stronger bond. Also, Hiccup's father, Stoick, might have a hard time adjusting to his son becoming a daughter, which could add a lot of emotional depth to the story.
In the fanfic, Link could be magically changed into a girl due to a wish made by an innocent character. Link then has to find a way to reverse the transformation while still dealing with the challenges of the world. He might face discrimination or different expectations from others in his new form, which could add depth to the story.
One idea could be a crossover where Naruto and Hinata somehow end up in the world of Inuyasha. Maybe they are on a mission and a strange portal sucks them in. Once there, they meet Inuyasha and his gang. Hinata could befriend Kagome due to their similar kind - hearted natures. Naruto, on the other hand, might get into some friendly sparring with Inuyasha over differences in their fighting styles.