A plot could be that Senri and Rima get separated from their vampire group during a battle with a rival group. They have to rely on each other to survive in the wild and find their way back. This would force them to communicate and understand each other better.
Imagine a fanfiction where Senri and Rima are sent on a mission to a human town to gather information. But they start to develop feelings for the human way of life. They struggle between their loyalty to the vampire world and their new - found love for the human world. This would be a great opportunity to explore their characters' growth and the complex relationship between vampires and humans.
They could be part of a prophecy in a fanfiction. The prophecy states that they will either bring great peace or great destruction to the vampire world. As they try to figure out what this means, they face internal and external conflicts. Senri might be more carefree about it at first, while Rima is more cautious. Their different attitudes towards the prophecy would lead to many interesting interactions and plot twists.
One interesting plot idea could be that Rima and Senri go on a secret mission for the vampire council. They have to face a group of rogue vampires who are threatening the peace between vampires and humans. Along the way, they discover a long - hidden power within themselves that helps them in the fight.
A really interesting plot could be a sort of 'what - if' scenario. For example, what if Shiki and Rima were to switch their roles or abilities? How would they adapt to this new situation? It could lead to some really creative storytelling, with them having to deal with the challenges and advantages that come with this role - reversal while still maintaining their bond.
Perhaps they fall in love in a fanfiction. Senri could be the one to break through Rima's cold exterior. They could have a story where they are forced to hide their relationship from the rest of the vampire community because of some old - fashioned rules. In this story, they would have to find ways to be together in secret, which would add a lot of drama and tension.
They could be paired up for a school project in the Vampire Knight world. Senri, who isn't very talkative, and Takuma, who is more outgoing, would have to find a way to work together effectively. This could lead to some comical situations as Senri tries to keep up with Takuma's enthusiasm.
Another way to develop their relationship is by having them face a conflict within the vampire community. Maybe there is a new rule that they both disagree with. Standing up together against this rule would strengthen their bond. Senri could be the more hesitant one at first, but Rima's determination could inspire him, and they would grow closer as they fight for what they believe in.
One possible fanfiction could be about Senri and Takuma going on a secret adventure in the Vampire Knight world. Maybe they discover a hidden part of the school that holds a powerful vampire relic. They have to work together to keep it safe from those who would use it for evil purposes.
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.