A possible fanfiction could be about a vampire who is fascinated by Twilight Sparkle's magic. He or she tries to get closer to her, either to learn from her or to use her magic for some dark purpose, and Twilight has to figure out their true intentions.
Maybe Twilight Sparkle is turned into a vampire. This would completely change her relationship with her friends and her role in Equestria. She would have to struggle with her new identity and the thirst for blood while still holding onto her magical knowledge.
One idea could be Twilight Sparkle discovers a hidden vampire society in Equestria. She tries to understand their way of life while also protecting her friends from any potential danger they might pose.
One idea could be that Spiderman gets transported to Equestria where he meets Twilight Sparkle. They could team up to stop a new villain that is causing chaos in both the human world and Equestria, perhaps a villain who has the power to open portals between the two worlds and is using it to steal valuable things from both. Twilight could use her magic to help Spiderman understand the new world he's in, and Spiderman could use his combat skills to protect Twilight when they are in dangerous situations.
They could become friends. The vampire could be an outcast in their own world and find solace in Twilight's acceptance. Twilight might see the good in the vampire despite their differences.
One interesting Twilight Sparkle vampire fanfiction could be 'Twilight's Vampire Transformation'. In this story, Twilight Sparkle might be turned into a vampire and have to deal with new powers and the vampire society. It could explore how her studious nature adapts to the nocturnal and often secretive vampire world.
One idea could be Tsukune learning a new and powerful vampire ability. For example, he discovers he can manipulate shadows in a way unique to him, which helps him in battles against other supernatural foes in the Rosario Vampire world.
There's also 'SunriseStoryteller'. This author is great at writing Twilight Sparkle vampire fanfiction that has a strong emotional core. They explore Twilight's internal struggles as a vampire, such as dealing with the isolation that sometimes comes with being a different kind of being, and how she tries to find her place again among her friends and in the world she knows.
One creative idea is the fusion of their powers. Naruto's chakra - based attacks and Twilight's magic could create some really cool and unexpected combinations. Like a jutsu that is enhanced by magic or a spell that is powered by chakra.
A likely candidate could be Discord. He is known for causing chaos and mischief. He might pretend to befriend Twilight Sparkle only to betray her at a crucial moment. Another possibility is Trixie. Trixie has been jealous of Twilight in the past and could betray her out of envy.
Often, these fanfics explore new character traits of Twilight Sparkle. When she's faced with the vampire world, she may show more courage or a different side of her intelligence. It's interesting to see how she adapts to this new and dangerous environment.
The fanfic could tell the story of how Nova Star and Sparkle first met. It could be a chance encounter in a magical forest where they both were drawn to a mysterious, glowing object. Their initial mistrust turns into friendship as they figure out the purpose of the object together.
Flash Sentry could be a likely groom. He has shown an interest in Twilight in the past and they have had some interactions that could lead to a romantic relationship. Another option could be a completely new character, perhaps a powerful wizard or a prince from a far - off land who Twilight meets during one of her adventures and falls in love with.