A plot could be that Kaname's sister discovers a long - lost vampire power that has been dormant in their bloodline. She decides to use this power to bridge the gap between the pureblood vampires and the lower - level vampires. This causes some purebloods to oppose her as they fear a change in the power structure. But she is determined to bring about a new era of peace and coexistence among vampires.
In a fanfiction, Kaname's sister could be the only one who knows the truth about an impending threat to all vampires. She tries to convince the vampire council, including Kaname, but they don't believe her at first. As she races against time to gather evidence and build support, she also has to deal with her own personal demons and the secrets from her past that are related to this threat.
She could be kidnapped by a group of rogue vampires who think they can use her to gain leverage over the headmaster. Her friends, both human and vampire, would then have to team up to rescue her. During her captivity, she might learn some secrets about the vampires that could change the way she views them.
One possible fanfiction could be about Kaname's sister being a hidden protector. She secretly watches over Kaname and Yuki, using her unique powers to keep them safe from the more dangerous vampires in the academy. Maybe she has the ability to foresee danger and intervenes at crucial moments without revealing her true identity.
One possible fanfiction could be where Kaname's sister has a hidden power that she discovers over time. She might struggle with how this power affects her relationship with Kaname and the other vampires in the story. For example, her power could be related to mind - reading, which makes her privy to secrets that she wishes she didn't know.
She could be a very powerful vampire in her own right. In the fanfiction, her powers might be different from Kaname's. For example, while Kaname has his own set of abilities, she could have the power to manipulate time. This power would make her a very interesting character as she could potentially change the course of events in the Vampire Knight world.
The plot could be about the child trying to bring about peace between vampires and humans. Using its special connection to both worlds, it could strive to end the long - standing feud. It would face many difficulties along the way, like distrust from both sides, but with determination and the legacy of its parents, it could make a difference.
The plot could involve a grand wedding ceremony in the Vampire Knight world. Yuki might be wearing a beautiful white dress, symbolizing purity and new beginnings. Kaname, in his elegant vampire attire, would be waiting for her at the altar. There could be a lot of political intrigue as well, with different vampire clans either supporting or opposing the union, since it might change the power dynamics among them.
The plot could revolve around her discovery of her family's past. As she uncovers the secrets and the struggles her parents went through, she gains a new understanding of herself and her place in the world. For instance, she might find old diaries or hear stories from the elders that open her eyes to the sacrifices her parents made for the greater good.
Perhaps there's a prophecy that foretells of Kaname and Zero's union resulting in something extraordinary, like the Mpreg. They initially resist it, as it goes against their nature and what they know. But as time passes, they start to see the potential in this new situation and work together to bring about a new era in the Vampire Knight universe, one that is more inclusive of their unique relationship.
Perhaps the sister discovers that there is a curse on their family that causes one member to become a killer. She believes that she can break this curse. So, she starts to look for ancient spells or artifacts that could reverse what has happened to Michael. Along the way, she faces many obstacles and has to fight against those who want to keep Michael as he is, a symbol of fear.
One possible plot could be that Caroline's brother discovers he has a special power that the vampires in Mystic Falls want to use for their own gain. He has to learn to control this power while also dealing with the danger of being hunted by the vampires.