A cool plot for a Rosario Vampire crossovers fanfic could be a time - travel scenario. The characters go back in time to the era when vampires were first created. They could meet the original vampire lords and learn about the true origins of their kind. This could also lead to a conflict as they might accidentally change the course of vampire history. Or perhaps there could be a crossover with a magical girl series. The Rosario Vampire girls could learn some new magical powers from the magical girls and use them to fight off a new threat that is immune to their normal vampire and monster abilities.
Well, a plot might be where the Rosario Vampire characters get involved in a sort of 'vampire Olympics'. Vampires and other monsters from different regions and series come together to compete in various events like fastest flight for winged vampires, strongest bite for the more traditional vampires, etc. Tsukune could be in a difficult situation as he's not a full - blooded vampire or monster, but he has to represent his school. Along the way, he could make new friends or enemies from the other crossovers and they all have to deal with some shady characters trying to rig the Olympics.
One idea could be that Batman ends up in the Rosario Vampire world while investigating a strange case. He has to deal with the vampires and other supernatural beings there while trying to find his way back home. Another could be a scenario where a character from Rosario Vampire travels to Gotham and causes chaos, and Batman has to figure out how to handle this new kind of threat that doesn't follow the normal criminal patterns. Maybe a vampire from Rosario Vampire becomes an ally of Batman in Gotham, and they team up to fight a greater evil that is affecting both their worlds.
One idea could be a story where the main character discovers a hidden power within themselves. Maybe they can control a new type of magic that no one in the Rosario Vampire world has seen before. This could lead to them having to face new enemies and also make new allies.
One possible interesting crossover could be having Luffy from One Piece end up on the Rosario Vampire campus. His carefree and fearless attitude would surely stir things up among the various supernatural beings there. He might mistake some of the vampire or monster students for strange new island inhabitants and try to befriend them in his usual enthusiastic way.
In a Naruto, Kyuubi and Rosario Vampire fanfiction, there could be a plot where a character from Rosario Vampire travels to the Naruto world and discovers the legend of the Kyuubi. This character could then try to bring the power of the Kyuubi back to their own world, creating a whole new set of adventures and challenges as they deal with the different cultures and powers in both worlds.
One of the most interesting crossovers is when the female characters from both series interact. For example, Integra from Hellsing and Moka from Rosario Vampire. Integra's strong leadership and no - nonsense attitude combined with Moka's more innocent yet powerful vampire side can create some really unique and unexpected storylines.
One of the most interesting crossovers is when they blend the powers. For instance, in some fanfics, the characters from Rosario Vampire gain some of Venom's symbiotic abilities, which makes for some really cool fight scenes. It's fascinating to see Moka with Venom - like powers, for example.
Some Rosario Vampire fanfic ideas involve time - travel. Imagine Tsukune being sent back in time to before he came to the school and having to make different choices. Also, fanfics about the backstories of the side characters are quite popular. Like exploring the past of Mizore and what made her the way she is. There are also fanfics that rewrite the entire plot with a different twist, such as if the monsters and humans were at war instead of co - existing at the school.
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.
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.
The OC could be a half - human, half - werewolf. They are trying to find a place where they belong, as they are not fully accepted in either the human or werewolf worlds. At Yokai Academy, they meet different characters from Rosario Vampire. Their journey of self - discovery could involve learning to control their powers, dealing with the politics between different monster species, and finding true friendship and love within the academy.