One possible plot could be that the OC is a new student at Cross Academy. Rido senses something special about her. He starts to follow her secretly, intrigued by her unique aura. As the story progresses, the OC discovers Rido's true nature but instead of being afraid, she is drawn to him in a strange way. Their relationship develops as they face various challenges together, like the conflicts between vampires and humans at the academy.
To create a strong OC, make her adaptable. In the world of Vampire Knight, things are constantly changing. If she can quickly adjust to new situations, like the discovery of new vampire species or the changing power dynamics at Cross Academy, she'll be more appealing. For Rido, show his leadership skills among vampires. And when he's with the OC, let his protective side come out. Their relationship should be based on mutual respect, and this will make both characters seem stronger in the context of the fanfiction.
In Vampire Knight fanfiction, Rido's daughter could play a villainous role. Since Rido was a rather malevolent character, she might follow in his footsteps and cause chaos among the vampires and humans. She could be seeking revenge for her father's death or trying to fulfill his unaccomplished plans of domination.
In fanfiction, Rido's daughter could be a key figure in changing the power dynamics within the Vampire Knight world. She may form alliances with different vampire clans or even with the human characters. If written as a sympathetic character, she could be a bridge between the vampires and humans, trying to find a way for coexistence. On the other hand, she could also be a more complex and conflicted character, torn between her loyalty to her vampire heritage and her own sense of right and wrong.
One interesting fanfiction could be about Rido's past relationship with Yuki's family. Maybe it delves into how his actions were influenced by his feelings for them. For example, it could show that his initial motives were not entirely evil but got twisted over time.
Well, in Vampire Knight Zero x OC fanfiction, the OC has to be well - crafted. It should fit into the dark and mysterious atmosphere of the Vampire Knight world. For example, if the story is set in the Cross Academy, the OC's backstory and abilities should make sense in that context. Maybe the OC has some special vampire - related powers or a unique human trait that draws the attention of the characters from Zero's world.
Another way fanfiction explores their relationship is by looking at their family ties. Yuki's family has a long - standing connection with Rido. Fanfiction can expand on this, like showing how their relationship is affected by the secrets and history of their families. It could be that there are hidden prophecies or agreements that bind them in ways not explored in the original Vampire Knight, and fanfiction can bring these to light and build a new relationship dynamic between Rido and Yuki.
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.
Many fanfictions explore the idea of Takuma protecting the OC. Given his character in the original Vampire Knight series, he is often portrayed as someone who is kind - hearted and protective. So, in the fanfictions, he might protect the OC from other vampires or from the secrets of the vampire world that could harm her. Also, the theme of self - discovery for the OC is quite popular. As she gets involved with Takuma, she learns more about herself and her place in this new world of vampires.
Aidou x OC fanfiction often delves into the emotional aspect of their relationship. The OC might struggle with adapting to the vampire world, and Aidou would be there to guide her. He could teach her how to control her bloodlust, how to use her vampire powers effectively. Their relationship could also be a source of growth for Aidou. He might become more empathetic and understanding through his relationship with the OC, breaking away from his sometimes brash and overconfident pureblood vampire persona.