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.
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.
A really engaging plot could be a time - travel story. Zero goes back in time and meets a younger Kaname. This changes the course of events in the Vampire Knight universe as Zero tries to prevent some of the tragedies that happened, and in the process, he and the younger Kaname form a unique bond that is different from their relationship in the original timeline. There could be a lot of drama as Zero has to deal with the knowledge of what will happen if he fails, and Kaname has to figure out who this strange hunter from the future is.
A plot could be Yuki and Kaname getting lost in a magical forest. In this forest, they discover secrets about their past that they never knew before. This could strengthen their relationship as they share these new revelations.
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.
One idea could be a prequel where young Yuki first discovers her unique connection to Kaname. Maybe she stumbles upon an old diary that has clues about their intertwined fates, and this sets off a series of events where she tries to learn more about Kaname's past while he is still a bit of an enigma to her.
In Vampire Knight fanfiction involving Kaname and Zero, there could be various interpretations. One could be a story where their relationship evolves in a world full of vampire politics. They might have to face challenges together against the traditional vampire hierarchy that disapproves of their bond. This could lead to them growing closer and perhaps having a deeper connection that goes beyond the ordinary friendship or rivalry shown in the original series.
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.
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.