Another great part of this type of fanfiction is the development of Buffy's powers. Since she's now a slayer of slayers, there could be new abilities she discovers or different ways she has to control her existing powers to handle the complex situations that come her way.
Often, in such fanfiction, new characters are introduced that interact with Buffy in unique ways. Maybe there's a slayer who was thought to be evil but is actually a victim of dark magic, and Buffy has to figure out how to deal with her without immediately slaying her.
One interesting aspect could be the exploration of Buffy's moral dilemma. In fanfiction, she might face situations where slaying another slayer is not as straightforward as it seems. It could be due to misinformation or being forced into a corner.
Perhaps an ancient evil entity that has a connection to the slayer line. It manipulates slayers into fighting each other, with Buffy being the main target as she's the slayer of slayers. This entity might want to disrupt the slayer line completely for its own dark purposes.
A great fanfiction idea could be a crossover where the Scooby Gang from Buffy's world visits Hogwarts. They all have their own skills and personalities that would interact really interestingly with the students and teachers at Hogwarts. Xander could make friends with the Weasley twins, while Willow might study magic with Hermione. And Buffy, of course, would be the one ready to fight any danger that arises.
One interesting story about Buffy Summers could be her first encounter with a major vampire. It was a life - changing moment for her as she realized the true extent of the danger in Sunnydale. She had to quickly learn to use her slayer powers to defend herself and others.
One interesting crossover could be Buffy teaching the students at Hogwarts some self - defense spells that are more combat - oriented than the ones they usually learn. For example, she might introduce ways to fight vampires and demons using magic in a more hands - on way.
There might be a fanfiction where Dawn travels back in time and meets a younger version of Buffy. This could lead to some really interesting interactions and changes in the timeline.
One interesting fanfiction could be about Spike's redemption arc in an alternate universe. Maybe he meets Buffy much earlier and their relationship develops in a completely different way, with him being more of a reluctant hero from the start. Another could be a time - travel story where Buffy and Spike are sent back to a crucial moment in the show's history and have to change things without messing up the timeline too much. And there are also those that focus on their emotional connection, like a story where Spike has to deal with his love for Buffy while she's in a coma.
One interesting story could be where Buffy meets the Cullens from Twilight. Maybe she initially suspects them of being dark vampires but then realizes they have a different code. Another could be a crossover where the Scooby Gang has to deal with the Volturi's power plays in Sunnydale. There are also fics where Buffy and Edward team up to fight a common vampire foe that is stronger than both their usual adversaries.
Some Xander fanfiction focuses on his love life in a more unique way. He could fall for a new character, a half - vampire half - human girl perhaps. Their relationship would be full of drama as they struggle with their different natures and the Scooby Gang's reactions.
One idea could be a crossover where Naruto's world is invaded by vampires. Buffy could travel to the Naruto universe to help fight them using her slaying skills and knowledge, while Naruto and his friends learn about the existence of vampires.
One idea could be an OC who is a witch from a long - lost coven that has a unique power related to time manipulation. This OC could accidentally get involved in Buffy's battles when trying to correct a time - related mishap in the supernatural world. Another idea is an OC who is a half - vampire, half - human hybrid, struggling to find their place between the two worlds. They could initially be seen as an enemy by Buffy but later become an ally.