Love is a very common theme. Often it's a forbidden love between a vampire and a human, like in many classic vampire stories. Another common theme is power. Vampires usually have supernatural powers, and the stories may explore how they use or abuse those powers.
Immortality and the passage of time are common themes too. Vampires live forever, so they experience different historical periods. This can lead to stories about how they adapt or how they are affected by the changing world around them. Also, the idea of a hidden vampire society is a popular theme, with its own rules and hierarchies.
The theme of self - discovery also often comes up. As they fight vampires, the two women may discover new things about themselves, their capabilities, and their place in the world. For example, they might find that they are braver than they thought or that they have a deeper connection to the supernatural world than they initially realized.
Love is a common theme. Just like in the Twilight series, love often plays a central role in vampire heart fan fiction. It could be the love between a human and a vampire with a special focus on the vampire's heart, perhaps as a symbol of their humanity. Another theme is the struggle between good and evil. Vampires in Twilight are complex, and in fan fiction, their vampire hearts might be a factor in this struggle, like whether their heart makes them more inclined towards good or evil.
One common theme could be the struggle between good and evil within the characters. Even as vampires, Dean and Sam might still have remnants of their former moral compasses. Another theme could be isolation, as they may be shunned by their human friends and allies due to their vampiric nature.
One common theme is friendship. The relationships between Yuki, Zero, and the other characters can be explored in depth. For example, how they support each other in the face of the challenges in the vampire - filled world. Another theme is the struggle for power. In the Vampire Knight universe, different vampire clans are vying for power, and fan fictions often expand on this concept. They might create new power struggles or show different ways the characters deal with the existing ones.
One of the common themes is redemption. Characters may try to make up for their past mistakes. For example, a character who has done something bad in the original show might seek redemption in the fan fiction. Also, exploration is a theme. They might explore new parts of the world they are in. And power struggles are also common, as different characters or groups vie for control.
Romance is a very common theme. Fans often write about falling in love with a band member. Another theme is friendship, like becoming friends with the band. Adventure can also be a theme, for example, going on a wild tour with the band in a fictional story.
One common theme is the forbidden love. Vampires are often seen as dangerous and different, so a relationship between a human and a vampire is considered taboo. For example, in many stories, the human is attracted to the vampire's power and mystery.
Love and lust are common. Female vampires often have passionate relationships, like in 'Twilight'.
Immortality is a common theme. Vampires are often portrayed as being immortal, and this leads to various storylines about their long - lived experiences, such as seeing civilizations rise and fall.
Romance is also prevalent. The allure of vampires makes them popular love interests. In the 'Twilight' series, the relationship between Bella and Edward is a central part of the story, though it's more YA but has influenced vampire adult fiction too. It shows the complex relationship between a human and a vampire.