The plot could involve Kirito, now a girl, exploring new aspects of her identity within the fanfic's world. Maybe she starts to see the virtual world from a different perspective, noticing details that she overlooked before. She could also form a unique bond with female characters in the story, sharing experiences that were not possible when she was male. And she may have to deal with discrimination or over - protection from other characters due to her new gender.
Some characters might be very surprised at first. For example, Asuna could be initially shocked but then become very protective of Kirito as a girl. Klein might make some teasing remarks but still be a good friend. And the villains might see her as an easier target or a new kind of threat depending on how they view female characters in general.
Well, one interesting aspect could be the new character dynamics. If Kirito is a girl, her relationships with other characters like Asuna might change in unique ways. For example, the way they interact and support each other could have a different flavor, perhaps more of a sisterly bond or a different kind of friendship.
The relationships will be different. In the original, Kirito had certain romantic and platonic relationships. If he's a girl, those relationships will transform. For example, his friendship with Klein might become more protective if Kirito is a girl, or his relationship with Asuna could be more complex, like dealing with different social norms about female - male relationships.
Next, consider how Link will react to becoming a girl. Will he be confused, angry, or curious? His emotions and internal struggle can be a big part of the fanfic. You can also think about how the other characters in the Zelda universe will react to his new form. Some might be accepting, while others could be more hostile or confused.
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 possible aspect to consider in this fanfic could be the implications on Penny's relationships. Since she becomes a real girl, her interactions with Ruby and the others might change. For example, she could experience more complex emotions and form deeper bonds. Also, the way she views herself and her purpose in the RWBY world would likely shift. She might start to question her place among the humans and Huntsmen more deeply.
In a 'sonic becomes a girl fanfic', the story could start with some kind of magical or scientific accident that turns Sonic into a girl. She then has to navigate her world with a new body. She may discover new abilities or limitations. Perhaps she teams up with female characters in the Sonic universe more often now and they form a strong girl - power group to take on the bad guys. There could also be a focus on how Sonic adjusts to her new appearance and how it affects her relationships with characters like Knuckles, who may have a different dynamic with her now.
In a 'sans becomes a girl fanfic', perhaps Sans - now a girl - decides to use this new form to her advantage. She could try to infiltrate a group that was previously only male - dominated in the Underground. This would lead to a whole series of adventures as she tries to keep her true identity a secret while achieving her goals.
Well, it could be about Ash waking up one day as a girl and having to deal with all the changes in his, now her, life. Maybe she has to adjust to new social dynamics, different reactions from friends and rivals, and also how to handle Pokémon battles in a different body.