The theme of trust is often present. Given that Harry and Voldemort are usually enemies, when it's a female Voldemort, the story might focus on how they learn to trust each other or not. And the theme of changing fate. They might try to change the fate that would usually lead to their enmity, for example by working together to prevent a greater evil.
The theme of forbidden love also often appears. Given their status as enemies in the original story, the idea of them having some sort of romantic or deep emotional connection in fanfiction is a popular one. It adds an element of drama and tension to the story.
Love and hate are also common. The complex relationship between fem Harry and Voldemort can be filled with both love and hate. It could be a romantic kind of love or a more platonic love - hate relationship. Identity is another theme. Fem Harry may have a different identity in the wizarding world compared to male Harry, and this affects how she deals with Voldemort.
A frequent theme is the re - imagining of the magical world. With Voldemort in a different role as an adoptive father, the power dynamics in the wizarding world change. Also, the theme of identity is prominent. Fem Harry has to figure out who she is in this new situation where she is associated with Voldemort. And there's often the theme of moral ambiguity as she may be exposed to dark magic yet still hold on to her own sense of right and wrong.
The theme of redemption can also be found. There are stories where Voldemort might be on the path to some form of redemption through his interactions with fem Harry. Also, the idea of forbidden love or a strange attraction sometimes pops up. It's a very different take on the original relationship between Harry and Voldemort. It challenges the traditional view of good and evil. And in some fanfictions, there's the theme of sacrifice. Fem Harry might have to sacrifice something dear to her in order to defeat Voldemort or change his ways.
One common theme could be power dynamics. With Voldemort as Harry's master, there would be a complex play of power, dominance, and submission. Another theme might be redemption. Maybe the story could explore if Harry can somehow redeem Voldemort or if Voldemort can find a different path despite being in a position of power over Harry. Also, identity confusion could be a theme, as Harry has to deal with being under the control of his archenemy in a new and unexpected form.
One common theme could be power dynamics. With Harry being female and in the role of Voldemort's queen, there would be a complex play of power between them. Voldemort is a very powerful and dark wizard, and how the female Harry navigates this relationship in terms of power is often explored.
Common themes include the exploration of dark magic. If Harry is Voldemort, he would be more involved with dark magic, so the fanfictions often show his journey into that world. Also, the theme of redemption might be present. Even though he's in the form of Voldemort, he might try to atone for Voldemort's past deeds. And there's always the theme of how the wizarding world reacts to this strange transformation of Harry.
The redemption trope can also be found in some of these fanfictions. Voldemort might start to change his ways because of his relationship with Fem Harry Potter. It's an interesting take as it goes against his established character in the original series. And then there's the trope of the hidden identity. Fem Harry Potter could be hiding her true nature from Voldemort, which adds suspense and mystery to the story.
One common theme is identity struggle. Fem Harry has to grapple with being the daughter of the most feared dark wizard while also having her own sense of self. Another theme is redemption. There's often an attempt to show that, despite her heritage, she can choose the path of good. And of course, there's the theme of family. It explores what family means when your father is Voldemort, and how that affects her relationships with other characters like the Weasleys who represent a more traditional, loving family.
A frequent theme is the exploration of a different kind of relationship. Since Voldemort is now female, it could lead to a more complex emotional and psychological relationship with Harry. Also, the theme of identity is common. How does a female Voldemort view herself compared to her male counterpart? And how does Harry react to this new version of his arch - enemy? These are often explored in such fanfiction.