The main characters could be anyone really. It might be a story centered around a human who discovers the vampire world and becomes the 'light in the darkness'. This human could have some unique quality or power that helps to bridge the gap between the different factions in the Twilight world. It could also be a vampire who has been living in the shadows but decides to step out and be a positive force, and this vampire could be the main character in the fanfic.
Since it's a fanfic, the author might introduce new characters. However, if it stays true to the Twilight essence, we would expect the Cullens to be involved. Alice, with her ability to see the future, could be a key character if the 'light in the darkness' has something to do with preventing a dark future. Or perhaps Carlisle, with his moral code, could be the main character if the story is about upholding good in the face of darkness.
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.
Since it's a Twilight fanfiction, it might focus on the Cullens as the main characters. One of them could be the one to bring the 'light in the darkness'. For instance, Carlisle with his moral compass and leadership could be the central figure in a story about guiding the family through a difficult time in the Twilight - like world. Or perhaps it could be a new Cullen - like vampire introduced in the fanfiction who plays this role.
It could be about many things. It might be a story that focuses on a glimmer of hope or positive force within the often dark and complex world of Twilight. Maybe it's about a character who serves as that light, perhaps a new vampire or human who changes the dynamics in Forks for the better.
I'm not sure specifically as we don't have more details about the story. But it could be an ordinary person who becomes a hero, like a young girl who finds a cure for a deadly disease in a world full of suffering. She would be one of the main characters.
I don't have enough information to say who the main characters are as I don't know the particular 'a light in the darkness story'.
It's an engaging tale that combines elements of mystery and romance in the Twilight universe.
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.
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.
I don't know for sure as I haven't read it. But it could be a protagonist who is struggling with some sort of inner turmoil or external conflict, and then there might be a secondary character who acts as the 'light'. For example, it could be a young wizard as the main character who is constantly battling his own dark magic tendencies, and then a wise old mentor could be the 'light' character.
I'm not sure as it depends on the specific fanfiction. It could be an original character created by the author who is trying to find their way out of a dark situation.