Well, identity is a common theme too. In 'female Muzan fanfic', the exploration of what it means to be Muzan as a female in a world that is mostly dominated by male demons. There's also the theme of survival. How does a female Muzan survive in a world full of threats? Some fanfics might show her using her wits and power to outsmart her enemies and stay on top.
One common theme is the exploration of femininity in a typically male - dominated character. Since Muzan is male in the original, making her female in fanfiction allows for a different take on power and how a female demon might rule.
One great 'female Muzan fanfic' could be 'The Female Muzan's Ascent'. It explores a unique take on the character, showing her in different scenarios and with different relationships. Another one might be 'Female Muzan: A New Perspective' which delves into her backstory in an interesting way.
Transformation is another popular theme. It could be the reader - insert changing muzan, or the other way around. Maybe the reader - insert is transformed into a being like muzan, or muzan starts to change his ways due to the influence of the reader - insert. These themes add depth and intrigue to the muzan x reader fanfiction.
Yes, there are quite a few. Some focus on an alternate universe where they have to team up for some strange reason. For example, in one fanfic, they have to face a new common enemy that is even more powerful than Muzan. Tanjiro has to put aside his hatred for a while to deal with this new threat.
Many 'female saitama fanfic' deal with the theme of adaptation. If Saitama is female, she may have to adapt to different expectations from society. There are also fanfics that focus on the theme of breaking stereotypes. A female Saitama can break the traditional image of a hero being male. This can be seen in fanfics where she shows that her gender doesn't limit her strength and abilities at all.
One common theme is the exploration of gender roles. Since Harry is female in these fanfics, it often shows how she navigates a world that was originally written with a male protagonist. Another theme is relationships, like how her friendships with Ron and Hermione might be different as a girl.
One common theme is empowerment. Since she is a female character in a game world often dominated by male characters, many fanfics focus on her showing strength and intelligence. For example, she might outwit male opponents in strategic battles.
Common themes in Inuyasha female fanfic are transformation. Female characters like Kagome may transform in terms of their abilities, beliefs or personalities. Another is the theme of heritage. How their family backgrounds and legacies affect them, like Sango's connection to her demon - slaying clan. And of course, there's the theme of adventure. The female characters often go on their own adventures, separate from the male characters, exploring new parts of the Inuyasha world and facing unique challenges.
Another theme is adventure. The female characters usually join Gohan in his adventures, whether it's fighting new villains or exploring new parts of the Dragon Ball universe. This adds an extra dimension to the story and creates new storylines.
Often, the theme of empowerment is seen. Female Zim is shown as strong and capable, taking on challenges that are sometimes different from what male Zim would face. Also, the theme of acceptance is there. How does the world around her, both on Earth and in the Irken Empire, accept or reject her as a female Zim? It makes for some interesting character development and plotlines. For example, in some fanfics, she has to prove herself to be as good as male Zim in certain tasks.