Since we don't have much information about this specific 'a taste of darkness fanfic', we can only make assumptions. The main characters might be characters who have a connection to the darker aspects of the story's universe. It could be a character who has always been on the fringes of the original story but now comes to the forefront because of their knowledge of the darkness. Or perhaps it's a group of characters who together must face a spreading darkness that threatens their world. They could be characters with different motives and backstories, some trying to fight the darkness, some being corrupted by it, and others trying to understand it.
It's difficult to say without reading the 'a taste of darkness fanfic'. However, it's common for fanfics to either focus on the original protagonists and give them new challenges related to the darkness theme, or introduce new characters that are embodiments of the darkness. For instance, if it's a fanfic based on a superhero story, the main characters could be the superhero facing a new, more menacing villain who represents pure darkness, or it could be about the superhero's sidekick who gets lured into the dark side and becomes a central character in this darker narrative.
It's got a lot of mystery and suspense. The main character finds themselves in a dark world with unknown dangers lurking around every corner.
Well, 'a taste of darkness fanfic' could center around a character's journey into the unknown, where they encounter all sorts of dark elements. It could be a story that takes the original work's concept and twists it to focus on the parts that are usually in the shadows. For example, if the original is a fantasy story, the fanfic might explore the dark magic or the evil creatures that lurk in the corners of that world. It could also be about a character's struggle with their own inner darkness, perhaps a hero who is tempted by the power of the dark side.
I don't know the main characters in 'a taste of fire fanfic' as I haven't read it. But in a typical fanfic, the main characters could be the original characters from the source material that the fanfic is based on.
I'm not sure specifically as it depends on the fanfic. But it could still feature the main characters from Twilight like Bella, Edward, and Jacob. They might be in different roles or have different relationships due to the 'taste of authority' aspect.
Often, there is a brave hero or heroine who stands against the darkness. They might be an ordinary person at first but discovers they have some special power or ability.
There might be a character who is an expert in a particular field relevant to survival, like a former military person with combat and survival training. And there could also be a more vulnerable character, perhaps a young person or someone with a disability, who the group has to protect. This would add an extra layer of complexity to the story and the relationships between the characters.
Since I haven't read this particular fanfic, it's hard to say for sure. But it could feature the main RWBY characters like Ruby, Weiss, Blake, and Yang. Maybe they are the ones who have to face the slithering darkness.
Jackie Estacado from 'the darkness' is an obvious choice. His connection to the Darkness power makes him a central figure and his skills and personality can drive the story forward in a crossover.
It might focus on Naruto and an antagonist who is deeply entrenched in the darkness. This antagonist could be a new character or an existing one from the Naruto series who has turned to the dark side. Other main characters could be the members of Naruto's team, who support him in his journey to understand and combat the darkness. They could provide different perspectives on how to deal with the dark elements in the story.
It's hard to say without reading it. But it could be the usual Twilight characters like Bella, Edward, and Jacob. Maybe it also features some minor characters from the original series in more prominent roles.