A really cool plot idea for a Naruto vampire turning fanfic could be that an ancient vampire curse is unleashed in the ninja world. Naruto is the first one to be affected as he's always at the forefront of danger. As he turns into a vampire, he starts to see the world in a different way. His relationships with his friends like Sasuke and Sakura change because he now has different needs and instincts. He might have to learn to control his vampiric side while also using it to his advantage against new, more powerful enemies that are attracted to his new power.
One idea could be that Naruto is turned into a vampire slave against his will. He has to struggle between his ninja values and the new vampiric instincts. Maybe he tries to find a way to break the slave bond while still using his vampire powers for good, like protecting the Hidden Leaf from new, more sinister threats.
One idea could be that a regular pokemon gets exposed to a strange, ancient energy that starts its transformation into a legendary. For example, a Pikachu accidentally stumbles upon an old, forgotten shrine in a forest and absorbs some of the mysterious energy there. Another plot could involve a pokemon trainer who has a special bond with their pokemon, and through that bond, the pokemon begins to evolve into a legendary form to save the trainer from a great danger. Maybe a Charizard turns into a Moltres - like form to battle an extremely powerful enemy threatening its trainer's life.
One idea could be a story where a new student arrives at Cross Academy who has a unique power that disrupts the balance between the vampires and the humans. This new character could be a hybrid of some sort, and their presence forces the main characters like Yuki and Zero to re - evaluate their beliefs and relationships.
Well, you could have a story where a new type of Pokemon is discovered that has vampire - like characteristics, like draining the energy of other Pokemon instead of blood. The main character, a young trainer, has to figure out how to deal with this new threat. Or perhaps there's a vampire Pokemon that was once a normal Pokemon but was cursed. It then tries to find a way to break the curse while befriending a group of trainers.
Perhaps a story where the characters from Vampire Academy get transported to a different time or dimension. They have to adapt to the new environment while also trying to find a way back home, and in the process, they discover new things about their own powers and relationships.
Maybe in the fanfiction, Naruto turns into a fox because of a powerful ancient curse that was placed on his clan long ago. As a fox, he has to learn to control his new instincts while his friends try to find a way to turn him back. This could lead to some really emotional moments as Naruto struggles not to hurt his friends in his new form.
One idea could be that as a girl, Midoriya has to face different social challenges within the hero academy. For example, she might encounter more discrimination in a male - dominated field. Another could be that her relationships with her male friends, like Bakugo, change in unexpected ways. Maybe Bakugo is more protective or more competitive in a different sense.
One idea could be Sasuke, as a girl, having to deal with different social interactions in the ninja world. For example, she might face new forms of discrimination or unexpected kindness. Another plot could involve her love life. Maybe Naruto has a different reaction to her now that she's a girl, and it could lead to a whole new dynamic in their relationship. Also, Sasuke as a girl could struggle with her identity and how it affects her goals of revenge and restoring her clan's honor.
A cool plot could be that a powerful vampire targets Naruto because of his unique chakra. Shinso gets involved as he senses something is wrong with Naruto. They discover that the vampire wants to use Naruto's chakra to break a curse on their clan. Shinso and Naruto must decide whether to help the vampire or fight against it.
Well, there could be a plot where Naruto is a half - vampire. His mother was a human and his father was a vampire. Hinata is drawn to his unique nature. They end up on a journey to discover more about Naruto's vampire heritage. On this journey, they encounter different vampire clans. Some are friendly and some are hostile. Naruto has to use his vampire powers, like enhanced strength and the ability to see in the dark, to protect Hinata. And through all these adventures, their love for each other blossoms.