Faith could be an important character. She might see Buffy's transformation as an opportunity to prove herself as the better slayer - turned - vampire. Xander would be there too, probably being the one who has the most trouble accepting Buffy as a vampire at first. And there could be new vampire characters created specifically for the fanfiction, like an ancient vampire who has some knowledge about Buffy's transformation and uses it to manipulate her for their own ends.
Definitely Spike. He has his own complex relationship with Buffy. In the fanfiction, he could be a mentor of sorts to Buffy, teaching her how to be a 'better' vampire, or he could see her as a rival in the vampire world. Giles would also be around. He'd be the voice of reason, trying to figure out what caused Buffy's transformation and looking for ways to reverse it while still guiding the Scooby Gang.
Spike is often paired with Buffy in this type of fanfiction. Since they already had a complex relationship when Buffy was a slayer, it becomes even more interesting when she becomes a vampire. Angel is also a common pairing. Their past relationship and his own experience as a vampire with a soul add a lot of depth to the story.
Well, in some 'Buffy turns into a vampire' fanfiction, there could be a plot where Buffy has to deal with the rejection of her friends at first. But then they realize that she's still Buffy deep down. Also, she could team up with some vampires who oppose the more evil ones, using her new vampire abilities for good in a way that no one expected.
One possible plot could be Dawn's struggle to control her new vampire instincts while still maintaining her relationships with the Scooby Gang. She might have to hide her transformation from Buffy at first, leading to a lot of internal conflict.
Buffy herself is a main character, of course. Then there's Willow, her witch friend, and Xander. Spike also plays an important role in these graphic novels.
Definitely Buffy. She's the one who the whole story revolves around. Her courage and determination make her a fan favorite. Angel is another popular character. He's a vampire with a soul, and his relationship with Buffy is full of drama and emotion. Xander is also popular among readers. He may not have special powers like Buffy or Willow, but his loyalty and humor are endearing.
One common theme is identity. Since Dawn becomes a vampire, she has to re - evaluate who she is. Another theme is family. Buffy's reaction to Dawn's new state and how they interact as sisters in this new situation is often explored.
One common theme is identity. Dawn has to figure out who she is as a vampire, different from her human self. Another theme is family. Buffy and the rest of the gang have to deal with Dawn in this new state, which tests their family bonds.
One common theme is the battle between good and evil. Buffy, as the slayer, represents good and the vampires are the evil she has to combat. It's a classic struggle that is central to most of these fanfictions.
One common theme is the struggle between good and evil. Since it involves vampires, there's often a battle between the forces of darkness (the vampires) and the forces of good, with Dawn sometimes caught in the middle.
Love and relationships are common themes. Many fanfictions explore Buffy's love for Angel or Spike further. Another theme is the struggle between good and evil. Since the show is about slaying vampires, this is often explored in new ways in fanfiction. And there's also the theme of self - discovery as the characters, especially Buffy, are constantly evolving.