One common theme is the transformation. The process of Harry becoming a female vampire and how it affects her physically and mentally. For instance, the new senses and cravings she has to deal with.
Love and relationships are also common themes. How her new vampiric nature impacts her existing relationships with Ron and Hermione, and also how it might lead to new romantic interests. Maybe she falls for a vampire from an old vampire clan, or perhaps a wizard who is intrigued by her new allure.
One common theme is the struggle between the magical world of Harry Potter and the vampire world. For example, in many fics, female Harry has to deal with the different rules and powers in both worlds.
One common theme is identity. Since Harry is now a female vampire, there's a lot of exploration about who she is in this new form. Another theme is power. Vampires usually have special powers, and the fanfictions often delve into how fem Harry uses and controls these powers.
A common theme is the clash of two different fictional universes. Since Harry comes from the wizarding world and the Vampire Diaries has its own set of rules regarding vampires, witches, and werewolves, seeing how these two worlds interact is often explored.
One common theme is identity struggle. Since fem Harry is now a vampire, she has to figure out who she is in this new state. Another theme is relationships. Her relationships with her old friends and new vampire acquaintances are often explored. For instance, how her friends react to her new nature.
One common theme is the exploration of gender roles. Since Harry is female in these fanfictions, it often looks at how she navigates a world that was originally written with a male hero in mind. For example, how she is treated in the wizarding society which has its own set of expectations for both genders.
A prevalent theme is isolation. Vampires are often seen as outsiders in the magical world of Harry Potter. So, Harry may find himself isolated from his friends and the wizarding community in general. He has to deal with the prejudice and fear that others have towards his vampire - like qualities. This theme adds a lot of emotional depth to the stories. In addition, the theme of redemption can also be found. Harry might try to redeem the image of vampires in the eyes of the wizarding world, or he might seek redemption for actions he takes while under the influence of his vampire side.
A common theme could be the exploration of different magical abilities. Since Harry Potter has magic from the wizarding world and Kakashi has his ninja skills and chakra, seeing how they interact in a story where Harry is female can be interesting. Another theme might be friendship or mentorship, as Kakashi could potentially mentor a fem Harry Potter in a new world of skills.
One common theme is the idea of breaking boundaries. Since they are from rival houses in the original series, their relationship in these fanfictions often defies the expectations set by Gryffindor - Slytherin enmity. Another theme is self - discovery. The female Harry Potter often discovers new aspects of herself through her interactions with Malfoy.
One common theme is the clash of two different worlds. The magical world of Harry Potter and the more gritty, monster - hunting world of Supernatural often collide in these fanfics. For example, how magic is perceived in the Supernatural universe where they mostly deal with physical weapons and brute force against monsters.
One common theme could be the exploration of female power. With a fem Harry Potter, the story might focus on how she uses her unique abilities in the face of the banshee - related challenges. Another theme could be identity. Since she's a different gender from the original Harry, she may struggle with how others perceive her in the wizarding world.