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.
The main characters could be a group of werewolves led by Sam or Leah. In this fanfiction, they might be the ones to act as the 'light in the darkness'. Maybe they discover a way to coexist peacefully with the vampires in a new and unexpected way, which changes the whole dynamic of the Twilight world as we know it in the original series.
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.
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.
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.
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.
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.
It could be about many things. It might be a story where a character serves as a glimmer of hope in the often gloomy and complex world of Twilight. Maybe it's about a new vampire or werewolf who brings positive change to the ongoing power struggles and relationships in the Twilight universe.
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'.
Obviously, Loki would be one of the main characters. He could be joined by Thor, his brother. Thor might represent the 'light' in contrast to Loki's more complex nature. Maybe they have to work together to combat the encroaching darkness. Another character could be Odin, who might have some knowledge or power that is crucial in dealing with this situation.