The theme of transformation is often seen. This could be the vampire's transformation into a more powerful form using Pokemon energy or the transformation of their Pokemon in unique ways due to the vampire's influence. Additionally, themes of loyalty and betrayal are common. The vampire may have to deal with Pokemon or other characters who either stay loyal to them despite their differences or betray them because of their vampiric nature.
One common theme is identity. Ash has to figure out who he is now as a vampire in the Pokemon world. Another is friendship. His friends' reactions and how they support or reject him can be a big part of the story.
One more theme is the power struggle. Vampires in these fanfics usually have certain powers that can either be a threat or an advantage in the Pokemon world. So, there could be a power struggle between vampires, Pokemon trainers, and the Pokemon themselves. This can create intense battles and complex relationships in the fanfic, as different characters try to assert their dominance or protect their own kind.
One of the main themes is acceptance. In these fanfictions, hybrids usually face discrimination from regular Pokemon or humans. So, the journey towards being accepted is a big part of the story. Also, friendship is a common theme. Hybrids often form strong bonds with other Pokemon or humans who see past their differences.
One common theme is empowerment. Female characters in these fanfictions often start as underdogs but grow to be strong trainers. For example, a girl might start with a weak female Pokemon but through hard work and determination, they become a powerful duo.
One common theme is the struggle with identity. Harry, being a vampire, has to deal with a new side of himself that he may not fully understand at first. For example, in many fics, he has to figure out how to balance his wizard self with his vampire instincts.
One common theme is the struggle between humanity and vampirism. When Ash is involved, it often shows his fight to keep his humanity intact even in the face of vampiric allure.
The theme of the outcast is also prevalent. Despite her power and allure, the vampire seductress is often an outcast in both the human and vampire worlds. Humans fear her, and vampires might be jealous of her power or see her as a threat. This sense of not belonging adds depth to her character and is often explored in different ways in fanfictions. For instance, she might try to find a place where she can be herself, or she might use her outcast status to her advantage by creating her own rules and living on the fringes of society.
Another theme is love and relationships. Since he's a vampire, his relationships with other characters, whether it's romantic or platonic, are often complicated. There might be a love interest who has to come to terms with Todoroki being a vampire, like in 'Todoroki's Vampire Love Affair' where the female lead has to navigate her feelings while also dealing with the danger that comes with Todoroki's vampirism.
A sense of otherworldliness is another theme. Vampire hypnosis fanfiction often plays on the idea that the vampire's world is different from the human world, and the hypnosis is a bridge between the two. In stories like 'The Otherworldly Hypnosis of Vampires', the hypnosis not only affects the human's mind but also gives them glimpses into the vampire's strange and alluring world, full of different rules, powers, and social hierarchies.
The theme of redemption can also be present. Sasuke may have a dark past as a vampire, and through his relationship with Sakura, he may seek redemption. This could involve him trying to control his vampiric urges or make amends for past actions.