Well, a plot could be centered around Zero's bites on Yuki having some unforeseen consequences. For instance, Yuki could start to develop some vampire - like powers slowly. This would cause a stir in the school, and Zero would feel guilty. Meanwhile, Yuki has to learn to control these new powers while dealing with the fact that she is becoming more like the creatures she once feared. And all this could lead to a more intense relationship between her and Zero as they face this new situation together.
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 of the best character developments is when Yuki becomes more empathetic towards Zero's situation. As Zero struggles with his bloodlust and his identity as a vampire, Yuki tries to understand him on a deeper level. This changes her from just a passive love interest to an active supporter. For Zero, his character development could be seen in how he becomes more protective of Yuki not just out of his duty as a vampire hunter but because he truly loves her. This makes their relationship more complex and interesting.
One idea could be that Aido discovers a hidden power within Yuki that she's not aware of. He then helps her to master this power while they face opposition from the vampire council who fear her new - found strength. Another could be a time - travel plot where Aido and Yuki are sent back in time and have to navigate the old vampire society to get back to their own time.
One plot idea could be that Yuki and Aido are forced to team up to solve a mystery in the Vampire Knight world. Maybe there are strange disappearances among the vampires and they have to put aside their differences to figure it out. They start to respect each other's skills during the investigation.
One interesting fanfiction could be where Yuki and Zero have to team up against a new vampire threat that the Night Class can't handle. In this story, their relationship deepens as they rely on each other's strengths.
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.
Perhaps Takuma and Yuki are forced to go on a journey together to find a cure for a strange illness that is affecting the vampire population. Along the way, they face many challenges and their relationship deepens as they rely on each other. They might also encounter some old enemies who try to stop them from achieving their goal.
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.
One idea could be exploring Yuki's past life before she was turned into a vampire. Maybe she had a family or a special talent that was lost in the transformation. Another could be a love triangle between Yuki, Zero, and Kaname in a different, more complex setting. For example, they are all part of a secret vampire society mission.
Well, perhaps in the fanfiction, there could be a ball in the vampire realm. Yuki is required to attend and Aido is tasked with being her escort. At first, Yuki is hesitant, but as the night progresses, they share a dance and a moment of connection. They then start to secretly meet up more often, exploring their new - found feelings for each other while trying to keep it from the other vampires.