Love and forbidden relationships are very common. Since werewolves and vampires are often portrayed as enemies, their love is seen as taboo. Another theme is power struggles. Both species usually have different levels of power, and fanfictions often explore who is more dominant. Also, identity is a big one. Characters might struggle with their dual nature if they are a half - werewolf, half - vampire for example.
The idea of fate also plays a big role. Some fanfictions depict the vampire and werewolf as fated lovers. Despite all the odds against them, they are meant to be together. It gives a sense of inevitability to their relationship. And then there's the theme of discovery. As they get to know each other, they also discover new things about themselves and their own species, which helps them bridge the gap between their two worlds.
One common theme is the struggle between two different natures. The vampire has its own set of powers and instincts, like a thirst for blood, and the werewolf has its own, like the change during the full moon. Their relationship often involves dealing with these differences.
Love is a very common theme. Often, a vampire and a werewolf will fall in love, which is against the norms of their respective societies. This creates a lot of conflict and drama.
One common theme is the struggle against prejudice. Since werewolves and vampires are often depicted as enemies in traditional lore, their love is seen as something that goes against the norm. So they have to fight against the prejudice of their respective communities.
Power struggles are common. Since vampires and werewolves are often depicted as powerful creatures, when combined with the Naruto universe, there are a lot of battles over power and territory. For example, who will control the hidden villages if vampires or werewolves are involved.
One common theme is identity struggle. The hybrid is often caught between two very different species, not fully belonging to either. For example, in many stories, they have to hide their true nature from both vampires and werewolves.
Identity is a huge theme. Since they are hybrids, they often struggle to figure out who they are and where they belong. Another theme is acceptance. They face a lot of rejection from both vampires and werewolves.
Love and forbidden relationships are also very common. Since werewolves and vampires are often depicted as enemies in their respective mythologies, a relationship between a werewolf and a vampire knight is seen as taboo. Fanfictions explore this idea by creating stories where the two characters fall in love despite the odds. It adds an element of drama and romance to the plot. Another theme is power struggles. Both werewolves and vampires have their own hierarchies and power structures, and when they cross over, there are often battles for dominance and control.
One common theme is the 'forbidden love'. Since vampires and werewolves are often portrayed as natural enemies in the lore, their love is seen as something that goes against the norms of their respective communities.
A less obvious but still common theme is the exploration of morality. Being a vampire or a werewolf often blurs the lines of right and wrong. Sherlock and John have to navigate through this moral grey area. In some fanfictions, they debate whether it's okay to use their supernatural abilities for personal gain or for the greater good. This exploration adds depth to their characters and the overall story.