It could be that the main characters are the Cullens as a whole. In many Twilight - related stories, the Cullen family often takes center stage. They might be the ones dealing with the 'devil' situation in this fanfiction. Or perhaps Jacob and his werewolf pack could also be main characters if the story focuses on the werewolf side of the Twilight universe and their interaction with the 'devil' - like elements.
The main characters might also include some of the minor characters from the original series that get more focus in this fanfiction. For instance, Angela or Jessica could be main characters if the story is told from a more human - centric perspective in Forks and how they experience the 'devil' that is the hidden supernatural world. It all depends on the direction the author of the fanfiction has taken.
Since it's related to 'Supernatural', it could have Sam and Dean as main characters. They are the hunters who are constantly in the middle of the fight against the supernatural. However, in 'the devil you know supernatural fanfiction', there could also be new characters introduced. Maybe a character who has a special connection to the devil, like a descendant of someone who made a deal with it in the past. This new character could add a whole new dimension to the story and interact with Sam and Dean in interesting ways.
I'm not sure specifically as there could be many different interpretations in Twilight fanfiction. It might be about a character facing a known 'devil' - perhaps a familiar antagonist in the Twilight universe in a new and interesting scenario.
The main characters are likely to be the ones from the original 'Twilight' like Bella, Edward, and Jacob. In fanfiction, they might be portrayed in different lights or with different personalities.
I don't know for sure who the main characters are in this specific fanfiction. But it's likely that it includes the well - known Twilight characters. It could also introduce new characters created specifically for this story. For instance, a young girl who discovers the power of the mirrors and her journey might be intertwined with the existing Twilight characters, making them all main characters in the overall narrative.
Typically, in a 'the walkers twilight fanfiction', we might see the protagonists from 'The Walkers' being thrust into the Twilight world. So, it could be characters like Rick or Michonne. Alongside them, the Twilight characters would also play significant roles. Bella might be involved in some sort of encounter with the Walkers, and Edward could be using his vampire abilities to deal with the new threat or situation that the Walkers bring to the Twilight universe.
Typically, the main characters would include Bella, Edward, and the other members of the Cullen family. Since it's a Twilight - related fanfiction, they are likely to be central to the story. However, new characters might also be introduced, perhaps someone who is related to the Twilight Key in a special way, like a guardian or a seeker of the key.
Well, it could be a new vampire that the author has created. This vampire might be a loner, living in the shadows away from the main vampire clans in Twilight. Another could be a human character who stumbles upon this hidden vampire world.
There might also be an older, wiser character, like a mentor figure. This character could guide the younger protagonists, sharing their wisdom and experience about the strange happenings in Blackwater. Their insights could be crucial in solving the problems that the characters face in the fanfiction.
It's hard to say without reading it, but it could be Bella and Edward. Since it's Twilight fanfiction, they are often central characters. Maybe the vow involves their relationship, like a vow of eternal love or a vow to protect each other from new threats in the story.
Another type of main character in these fanfictions could be a human who becomes intertwined with Benjamin's life. This human might be in a dangerous situation that only Benjamin can save them from, or they could be someone who has an unexpected bond with Benjamin. This creates a lot of drama and interesting plotlines as the relationship between the human and Benjamin develops, often against the backdrop of the vampire - human relations in the Twilight world.