Well, a common theme in such fanfiction is the exploration of immortality. When reborn as a vampire god, the character has to deal with living forever. This can lead to themes of loneliness and the search for meaning in an endless existence. Additionally, there's often the theme of transformation. Not just the physical transformation into a vampire god, but also the mental and emotional changes. They might have to adapt to new powers, instincts, and a different way of seeing the world.
One common theme is the struggle for power. As a reborn vampire god, the protagonist often has to face other powerful beings in the vampire world. Another theme could be redemption. Maybe the character was a bad person in their past life and now, as a vampire god, they try to make up for their past mistakes. Also, love is a frequent theme. They might find an unexpected love interest, either a human or another supernatural being, which adds an interesting dynamic to the story.
The theme of identity is quite common. A character reborn as a vampire god has to figure out who they are now. Are they still the same person they were before? Or has the transformation into a vampire god completely changed them? Another theme is the battle between good and evil. They may be tempted by the dark side of their new vampire god powers, but also strive to use them for good. And then there's the theme of family or a new 'vampire family' that they become a part of, which can bring both support and conflict.
One common theme is the struggle between the human and vampire worlds. The reborn character often has to navigate the complex relationships and power dynamics. Another theme could be redemption. For example, a character who was once bad in their past life gets a chance to be good in the vampire knight world. Also, love is a prevalent theme, whether it's a forbidden love between a human and a vampire or a complex relationship among vampires themselves.
One common theme is power struggle. Since you have a vampire god involved, there's often a fight for power or control. Another theme is the clash of different mythologies. The magic of Harry Potter world collides with the vampire lore which has its own set of rules and beliefs.
One of the most popular characters in this type of fanfiction is the protagonist - the one reborn as a vampire god. Their internal conflict, growth, and new abilities make them a central focus. Enemies are also popular characters. These could be rival vampire lords who see the new vampire god as a threat to their power. And then there are the sidekicks. They can be other vampires or supernatural creatures that stick by the reborn vampire god's side, providing comic relief or crucial support during battles.
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.
In RWBY vampire fanfiction, a frequently seen theme is the clash of cultures. The RWBY world has its own set of values, and vampires bring in their own set of rules and behaviors. This can lead to interesting interactions and conflicts. Another theme is the search for a cure. If a character is turned into a vampire, they or their friends may be on a quest to find a way to reverse the transformation. And the theme of outcasts also exists. Vampires are often seen as outcasts in the RWBY world, and this can be explored in terms of how they deal with being shunned by society and how they form their own communities or try to integrate into the existing ones.