One plot idea could be Tsukune's further exploration of his unique powers in the Rosario Vampire world. He might encounter a new type of enemy that challenges his abilities in ways he hasn't faced before. Another could be a love triangle involving Tsukune, Moka, and another character, creating a lot of drama and tension. Maybe Tsukune has to go on a quest to find a lost artifact that has significance in the vampire world, and along the way he discovers more about his own heritage.
Tsukune could find himself in a situation where he has to train a group of new students who are half - vampires like him. He would have to teach them how to control their powers and deal with the prejudice from both humans and full - blooded vampires. Another idea is that he discovers a hidden part of the school that holds ancient secrets about the origin of vampires. This discovery could put him in danger as there are those who want to keep those secrets buried, but it also gives him a chance to rewrite the future of the vampire - human coexistence.
A possible plot is Tsukune getting involved in a vampire politics situation. He could be used as a pawn by different vampire factions, and he has to use his wits to outmaneuver them. Or perhaps he starts a club at school that is dedicated to understanding the relationship between humans and vampires better, which attracts all kinds of strange and interesting characters. Also, Tsukune might have a prophetic dream that leads him on a journey to prevent a great disaster from befalling the vampire and human worlds.
There could be a fanfiction where Tsukune and Moka accidentally switch bodies. This would lead to a lot of comical situations as they try to adapt to each other's lives. Moka in Tsukune's body would have to deal with human school life and Tsukune in Moka's body would have to handle the vampire society. Additionally, a plot about a mysterious prophecy that involves both of them and their fates being intertwined with the future of the vampire - human relations could be really engaging.
Tsukune himself is quite interesting. He's a human in a world full of vampires, which makes him an outlier. His journey of adapting to this new world and developing his powers is always engaging. Moka is also a great character. Her dual personality, with the sweet outer self and the more powerful vampire self, adds a lot of depth. Inner Moka especially is a force to be reckoned with. And then there's Kurumu, the succubus. Her pursuit of Tsukune in the fanfiction can lead to some really fun and flirty storylines.
One plot idea could be Tsukune and Ria going on a journey together to discover a hidden power within the Rosario Vampire world. This could involve them facing various monsters and challenges along the way, and their relationship growing stronger as they rely on each other.
A more romantic plot could involve Yukari developing deeper feelings for Tsukune and trying to confess her love in a world full of supernatural distractions and challenges. It could show how their relationship might develop in a different way from the original story.
One interesting plot idea could be Tsukune having to protect his harem members from a new powerful vampire threat that has emerged in the school. This would involve a lot of action scenes where Tsukune uses his growing powers.
One interesting plot could be Tsukune and Ruby going on a secret mission within the Yokai Academy. They might have to face a new type of supernatural threat that neither of them has encountered before. This would test their skills and their relationship as they rely on each other to survive.
Well, a plot idea could be that Kurumu and Tsukune get trapped in a time - loop. They keep repeating the same day over and over, and in the process, they learn more about each other's true selves. Each repetition of the day brings them closer together as they figure out how to break the loop.
Some fanfictions focus on what - if scenarios. What if Tsukune was actually a powerful vampire from the start? How would that change his relationship with Mizore? There are also fanfictions that deal with challenges to their relationship, like a rival for Tsukune's affections who is also a powerful monster. This creates a lot of drama and tension in the story as Mizore has to fight for Tsukune's love.
Well, a simple plot could be that Female Tsukune is new to the school and accidentally catches the eyes of several interesting characters, thus forming a harem. They each try to court her in their own unique ways. A vampire might use his charm and knowledge of the night to impress her, a witch could use magic to create beautiful things for her. As the story progresses, Tsukune has to figure out who she really likes among them while also dealing with the jealousy and drama that comes with a harem situation.
Fanfiction could also center around Mizore and Tsukune training together. Since they both have different powers, they could learn from each other. Tsukune could teach Mizore about human resilience and determination, while Mizore could show Tsukune how to better control his powers, especially when it comes to the more vampiric aspects. Their training sessions could be filled with both comical and intense moments.