One common theme is the struggle between different species, just like in the original Vampire Knight. The OC often has to deal with the tensions between vampires and humans. For example, in many fanfictions, the OC might be a human who falls in love with a vampire, similar to Yuki's situation in the original but with their own unique twists.
Another theme is self - discovery. The OC, being a new element in the Vampire Knight Zero world, has to figure out their place and identity. They might discover new powers or a new purpose in life while interacting with the well - known characters of the series. This theme adds depth to the character and makes the story more interesting.
The theme of redemption also appears quite often. Maybe an OC who has a troubled past or a vampire who has done bad things in the past tries to make amends in the world of Vampire Knight Zero. This theme ties in with the complex moral and ethical situations present in the Vampire Knight universe and gives the fanfiction a more thought - provoking aspect.
The theme of identity is also very common. Zero has to figure out who he really is, whether he's a human, a vampire, or something in between. Additionally, redemption is a popular theme. Given Zero's actions and his inner turmoil, many fanfictions explore his journey towards redemption. There's also the theme of power, like how Zero gains or loses power and how he uses it.
A common theme is the forbidden love. Since Zero is a vampire hunter with vampire blood in him, an OC getting involved with him is often a love that goes against the norms of the world they live in. Another theme could be self - discovery. The OC might come to the Vampire Knight world not knowing much about herself, and through her interactions with Zero and others, she discovers her true nature.
A common theme is the battle between good and evil. Zero, being a vampire hunter who is also part vampire, embodies this struggle. Fanfictions often delve deeper into his moral dilemma, whether he should fully embrace his vampire nature or continue to fight against it as a hunter.
The theme of identity is also prevalent. Zero is constantly trying to figure out who he is now that he is part vampire. Yuki too has an identity crisis as she is caught between the human and vampire worlds. Fanfictions often delve into how they come to terms with their new identities, whether they accept them or try to change them, and how it affects their relationship with each other and those around them.
One common theme is redemption. Maria often plays a role in Zero's journey towards redemption from his dark past as a vampire hunter. Another theme is forbidden love, as their relationship may be frowned upon in the Vampire Knight world.
Another common theme is the struggle between their different natures. Zero being a vampire hunter and Yuuki having vampire blood, their inner conflicts are often explored in fanfictions. For example, how they deal with their opposing instincts in certain situations.
The struggle between the vampire and human worlds. Kaname is a vampire, and Zero is a vampire hunter. Fanfictions often delve into how they navigate their opposing roles, either finding common ground or being torn apart by their differences. It's about the moral and ethical dilemmas that come with their positions in the Vampire Knight world.
One common theme is the struggle between her human and vampire sides. Since Female Zero has a complex nature in the Vampire Knight world, many fanfictions explore how she copes with this duality. Another theme is her relationships, whether it's with other vampires or humans. It could be a romantic relationship or a strong friendship.
One common theme is the struggle between their different identities. Kaname being a pureblood vampire and Zero being a vampire hunter, their identities are at odds, and many fanfictions explore how they overcome this. For example, in some stories, they realize that they are more alike than different in their desires for a better world for vampires and humans alike.
Love against all odds is also a prevalent theme. In the Vampire Knight world, their relationship is not something that society would easily accept. So they have to fight against the norms and prejudices. This adds a lot of drama and intensity to the fanfiction stories. The stories often show how they overcome these obstacles to be together.