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.
It might be characters from an existing franchise that the fanfiction is based on. For instance, if it's a fanfiction based on a superhero story, it could be a sidekick character who has always been in the shadow (the darkness) of the main superhero but then discovers their own power and becomes their own 'light'.
It could be about various things. Maybe it's a story where a glimmer of hope or goodness (the light) is found within a dark and difficult situation. For example, in a post - apocalyptic world full of chaos and despair, a character might discover their inner strength or find a group of people with positive values (the light).
It's hard to say exactly who the main characters are without reading the fanfiction. But if we consider the themes of 'darkness in the light', it could be characters who are on the verge of losing their way in the light - filled Yu - Gi - Oh world. It might be some of the minor characters from the original series who are given more depth in this fanfiction. For example, a character who was always in the background but now is in the center of a story arc dealing with the discovery of a dark power within a seemingly innocent card. Or it could be an entirely new character created by the fanfiction author who has a unique connection to both the light and the darkness in the Yu - Gi - Oh universe, and through their journey, we explore the concept of 'darkness in the light' more deeply.
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.
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.
Well, 'the darkness within fanfiction' could be about exploring the hidden or negative aspects within the world of fan - created stories. It might involve delving into the darker themes, characters' inner turmoil, or the not - so - pleasant elements that exist in the fanfiction universe.
Since we don't have much information about this story, it's hard to say. But I would assume that there is a character who has the 'darkness within' and is the pursuer. And then there might be this 'loath nolder' character that is being pursued.
I'm not sure specifically as it depends on the author's creation. But it could be characters who are on a journey to understand the true nature of darkness and light, like a young adventurer or a wise old sage.
In this fanfiction, aside from the core RWBY team, there could also be other important characters. Ozpin might play a role as he often has knowledge and guidance to offer. Qrow Branwen could also be involved as he is Ruby's uncle and has his own set of skills and connections. Additionally, characters like Pyrrha Nikos might make an appearance if the story is set in a timeline where she still exists, and she could be a powerful ally in the battle against the darkness.
In many Harry Potter fanfictions titled 'The Darkness Within', it often explores the hidden, negative aspects within the characters. For example, it might delve into Harry's inner turmoil, perhaps his struggle with the part of Voldemort's soul that was once inside him in a more in - depth way than in the original books. It could also show how the experiences he had, like the loss of his parents and the constant battle against the Dark Arts, have left a mark on his psyche that could be considered 'the darkness within'.
In fanfiction, 'starlight within the darkness' can often symbolize hope. It might represent a glimmer of good in a dark or difficult situation. For example, a character's small act of kindness could be the starlight within the darkness of a war - torn world.