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.
Some interesting plot ideas for Vampire Knight Zero Fanfiction could be a story where the vampires and humans try to co - exist in a completely new way. Maybe they start a joint project, like building a new city or a school system that caters to both races. Another idea is to have a character who is half - vampire and half - human, but with powers that are different from both. This character could struggle with their identity and try to find their place in the world of Vampire Knight Zero. Also, a plot could involve a magical object that has the power to either destroy all vampires or make them fully human, and the race to find or protect this object.
A plot could revolve around Zero being in a submissive role in a training scenario with other vampire hunters. He might learn new skills while dealing with his submissive nature. This could lead to character development and new relationships within the hunter group.
One plot idea could be exploring Zero's inner struggle with his vampire nature in a more in - depth way while Kaname is trying to protect him from the darker aspects of the vampire world. Maybe Kaname discovers a way to temporarily suppress Zero's thirst for blood, but it has unforeseen consequences on Zero's emotions and relationships.
A great plot for a Vampire Knight Zero and Ichiru fanfiction could be set in an alternate universe. In this universe, they were never separated by the circumstances in the original story. They grow up together as normal brothers, without the knowledge of vampires. However, as they get older, they start to notice strange things happening around them. Eventually, they discover the existence of vampires and have to decide whether to fight them or join them. This story could explore their bond in a completely new context and show how they would react to this new world compared to their counterparts in the original story.
One idea could be a Kitsune Zero who has the power to disrupt the hierarchy in the Vampire Knight world. Maybe Zero discovers that the Kitsune's powers can nullify the vampire's thirst for blood, leading to a complex relationship between him and the vampires. Another plot could involve a Kitsune Zero being a long - lost key to a prophecy that involves the coexistence of vampires, humans, and other supernatural beings in the Vampire Knight universe.
Kiryu could be given a mission to infiltrate a powerful vampire clan in a fanfiction. He would have to disguise himself and navigate their complex social structure, all while trying to gather information for the good of the humans. This would put him in many dangerous and interesting situations.
One plot idea could be a pre - story exploration of their relationship. Maybe show how they first met in a more detailed way than in the original work. For example, it could be a chance encounter during a dangerous vampire - hunter situation where they initially mistrust each other but then gradually realize they have a connection.
One interesting plot idea could be that Kain and Zero are forced to team up to fight a new, powerful enemy that threatens the vampire - human coexistence in their world. This would put their differences aside and make them learn about each other's strengths and weaknesses.
Another plot could involve a time - travel scenario where Yuki goes back in time to before Zero became a vampire hunter. She tries to change the events that led to his current situation, but it gets complicated as it might affect the entire Vampire Knight world order. This could lead to a series of adventures where they have to face both old and new enemies.
One idea could be a fanfiction where the kiss is a turning point in their relationship. After the kiss, Zero struggles with his vampire nature more intensely as his feelings for Yuuki deepen. Yuuki, on the other hand, realizes she has a stronger connection to Zero than she thought. Another plot could be that the kiss was part of a deal to save the school from a new vampire threat. They have to pretend to be in love after the kiss, but then real feelings start to develop.
One plot idea could be that Zero's 'death' is not really permanent. He could be in a state between life and death, and Yuki has to go on a journey to bring him back fully. Maybe she has to make a deal with some powerful vampire entity who has the ability to revive Zero.