For a Vampire Knight x OC fanfic, a cool plot could be that the OC has a connection to the night class through a prophecy. She is foretold to either save or destroy the vampire - human coexistence at the academy. As she gets closer to the vampires in the night class, she discovers secrets about her own past that are linked to the vampires. She might also have a unique blood type that has different effects on vampires, such as making them more powerful but also more vulnerable to sunlight. This would attract the attention of all the vampires, good and bad, in the story.
Well, an interesting plot could be that the OC is a transfer student who is secretly a vampire hunter but falls in love with a vampire at the academy. It would create a great internal conflict for the character. Also, the OC could be a half - vampire, half - human who is trying to find her place in both worlds. Maybe she has an ability that neither vampires nor humans have, like the power to heal vampire bites on humans. This would make her a target for both sides who want to use her power for their own purposes.
One idea could be a story where a new student arrives at Cross Academy who has a unique power that disrupts the balance between the vampires and the humans. This new character could be a hybrid of some sort, and their presence forces the main characters like Yuki and Zero to re - evaluate their beliefs and relationships.
One idea could be an OC pureblood who has the power to control dreams. They could use this power to either protect the school from hidden threats or accidentally cause chaos by interfering with the dreams of the students. For example, the OC might enter Yuuki's dreams to show her hidden memories of her past that she doesn't remember.
One idea could be a crossover where a character from Twilight finds themselves in the Vampire Knight world. For example, Bella could end up at Cross Academy. Maybe she'd be mistaken for a new student and have to navigate the complex social structure there, with the Day and Night classes. Another plot could involve a vampire from Vampire Knight traveling to Forks. They'd have to deal with the Cullens and the werewolves, which would create a whole new set of power dynamics.
For Vampire Knight Pendragon OC fanfiction, an OC could be a time - traveler who accidentally lands in the middle of the vampire - human conflict. This OC would have to use their knowledge of different eras to try and find a solution. Another concept is an OC who is a vampire - hunter but has a change of heart when they learn more about the vampires in the Vampire Knight Pendragon world. Maybe they fall in love with a vampire. And finally, an OC who is a lost heir to a powerful vampire family in the story could be an exciting idea. Their arrival could disrupt the existing power balance and create a whole new set of storylines.
The OC could be a half - human, half - werewolf. They are trying to find a place where they belong, as they are not fully accepted in either the human or werewolf worlds. At Yokai Academy, they meet different characters from Rosario Vampire. Their journey of self - discovery could involve learning to control their powers, dealing with the politics between different monster species, and finding true friendship and love within the academy.
A more action - packed plot could be the red knight leading a rebellion against the vampire hierarchy. They gather other vampires and humans who are tired of the oppression and fight for a new order. Along the way, they discover secrets about the vampire world that could change everything.
A possible plot is that a dark force in both the Inuyasha universe (connected to Kagome) and the Vampire Knight world is trying to take over. Kagome and the main characters from Vampire Knight, like Zero and Kaname, have to work together. Kagome's knowledge of magic and spiritual energy could be combined with the vampires' powers to combat this threat. They might start off distrusting each other but gradually learn to rely on one another.
Well, a plot could revolve around Kanme's struggle with his vampire nature in a different way. For example, he discovers a new power within him that he doesn't understand and has to learn to control it while also dealing with the politics and power struggles in the vampire world. Also, a story where Kanme forms an unlikely alliance with a group of humans who are trying to understand vampires better could be really engaging.
Well, a plot could center around a time - travel aspect. Imagine if a character from the present in Vampire Knight Zero accidentally travels back to a crucial point in the vampire - human history. They could then change some events that have a ripple effect on the current story. Or, a fanfiction could be about a secret society within the vampire world that has been hidden from the main characters. This society could have its own rules and goals that conflict with what the protagonists believe. Additionally, a story about a curse that affects not only vampires but also humans in a unique way could be really engaging.
Maybe there's a Halloween prank gone wrong. A group of human students decides to play a spooky prank on the vampires, but they accidentally unleash an old vampire curse that starts to affect the whole academy. The characters then have to find a way to break the curse before it's too late.