Another common theme is self - discovery. As the female character gets closer to Kaname, she also discovers more about herself, her powers (if in a supernatural setting), and her place in the world. For example, she might learn about her own hidden strength or her true purpose.
The theme of sacrifice also pops up frequently. In many fanfics, either the female character or Kaname has to make sacrifices for the other or for the greater good. This could be sacrificing their own desires, relationships, or even their lives in some extreme cases. This adds a layer of drama and emotional depth to the story.
Another common theme could be power dynamics. Depending on the nature of the original story, there might be differences in power between the two characters. Fanfiction could explore how they deal with these power differences, whether it's kaname having more power and how female zero reacts to it, or vice versa. There might also be themes of loyalty and betrayal in relation to their relationship and the world they are in.
One common theme is the struggle against their different natures. Kaname being a vampire and Zero being a vampire hunter, so there's often a conflict between their natural instincts and what they feel for each other.
The themes usually revolve around their relationship. One is the theme of protection. Kaname is always very protective of Yuki, and this is often explored in fanfics. Another is the theme of discovery. Yuki discovers more about herself and her feelings for Kaname as the story progresses. And there's also the theme of forbidden love. Since their relationship is complex due to their different species, this adds an element of the forbidden which is a common theme in many fanfics.
The theme of sacrifice is also prevalent. Kaname or the OC may have to sacrifice something, like their own desires or safety, for the sake of their relationship. Also, power dynamics play a role. Kaname is a powerful vampire, and how the OC deals with that power in their relationship is often explored.
The theme of power and hierarchy within the vampire world is also quite common. Kaname being an important figure in that world, fanfictions might show his dealing with political intrigue, power struggles among different vampire clans. And his relationship with the Pureblood vampires and how he navigates that complex social structure is often a part of these stories. For example, some fanfictions might focus on how he tries to reform the old ways of the vampire hierarchy to protect both vampires and humans.
One common theme is jealousy. Kaname might be jealous of Zero's relationship with other characters, which could lead to him hurting Zero either intentionally or unintentionally. Another theme could be power struggles. Given their different natures and abilities in the original story, this could play out in fanfiction with Kaname using his power to harm Zero in the context of a power - related conflict.
Love is a very common theme. Most fanfictions focus on the deep love between Kaname and Yuki, exploring different aspects of it like unrequited love or forbidden love.
One common theme is love and romance. Given their relationship in the original work, fanfictions often explore different aspects of their love, like how they overcome obstacles to be together.
One common theme is the forbidden love aspect. Since Zero and Kaname have their own complex relationships and loyalties in the original story, a kiss between them is often seen as something that goes against the norms or their own personal boundaries.
One common theme is the exploration of their relationship's development. The kiss often marks a turning point in their connection, whether it's the start of a romantic relationship or a reaffirmation of their feelings for each other.