One common theme is the struggle between different natures. The female vampire has her vampiric instincts like the need for blood, while the male human is mortal and has a different set of values. Another theme is the forbidden love aspect. Their relationship often goes against the norms of society, whether it's the vampire society or the human one. It adds an element of excitement and danger.
Often, there's a theme of acceptance. The two characters have to accept each other's differences, whether it's physical or cultural. Another theme is the idea of a shared adventure. They might go on a journey together and their relationship deepens during that time. Also, themes of loyalty and protectiveness are quite common as the male human might feel the need to protect the female furry in a world that may not always understand their relationship.
Self - discovery is also a theme. The male human might discover new aspects of himself through his relationship with the vampire. He could become more confident, or he might learn about the hidden world of the supernatural, which changes his perspective on life.
Adventure is also common. They might embark on a quest together, like exploring an unknown planet or searching for a lost artifact. And of course, there's often a romantic element as they come from such different backgrounds yet are attracted to each other.
The struggle between Blaine's vampire nature and his love for Kurt is a big theme. He has to fight his natural instincts like the urge to drink blood, especially when he's around Kurt. Also, the idea of Kurt being in danger because of Blaine's vampire enemies is a common plot point. It adds drama and tension to the story. And sometimes, there's a theme of redemption, where Blaine tries to be a better 'person' for Kurt.
The theme of protection is also prevalent. The female werewolf might feel the need to protect the human from other werewolves who see the human as a threat or from humans who might want to harm the werewolf. And sometimes, the human tries to protect the werewolf's identity in the human world, which can lead to some tense and interesting situations.
One common theme is the clash of two different worlds - the wizarding world and the vampire world. Another could be the idea of forbidden love, as vampires are often seen as outsiders in the Harry Potter universe. Also, power dynamics are often explored, like who is more powerful between a powerful wizard and a female vampire.
One popular 'female vampire x male human' fanfiction is 'Blood Ties'. It tells a story of a young man who accidentally stumbles into the world of a female vampire. Their relationship starts off rocky but gradually evolves into a deep, complex bond. Another one is 'Moonlit Encounter' where the female vampire saves the male human from a dangerous situation, and they are then drawn to each other in a way that defies the norms of their two worlds.
Another theme is the transformation of the human male. Through his relationship with the female predator, he may undergo significant changes in his personality, beliefs, or physical abilities. This could be due to the influence of the predator's more aggressive or instinct - driven nature rubbing off on him.
One common theme is the power of friendship that evolves into love. For example, in many stories, the male human and the female pokemon start off as just friends or trainer - pokemon partners. Another theme is the acceptance of differences. Since they are from different species, they have to accept each other's unique qualities. Also, adventure is often a theme as they usually go on journeys together in the Pokemon world.
One common theme could be the power dynamic. Since the female is an elite, there might be exploration of how the male human deals with her status and power. Another could be a kind of 'fish out of water' scenario if the male is from a more ordinary background.