There could be a variety of main characters. A vampire protagonist, who is the focus of the story and through whose eyes we experience the world of Darkness Falls. There might be a human who is drawn into the vampire's world, either by accident or by some kind of connection. This human could be a key figure in the story, bringing a different perspective. Additionally, there could be a vampire elder, an ancient and powerful being who has rules over Darkness Falls or has a significant influence on the vampire community there. It's also possible that there are other supernatural creatures in the story that interact with the vampires and could be considered main characters as well.
In 'Darkness Falls: A Dark Angels Novel', the main characters would predominantly be Dark Angels. These could be the veteran warriors who have seen countless battles and hold the secrets and traditions of the chapter. There may be a young initiate who is on a journey to prove himself and discover the true nature of the Dark Angels. Additionally, there could be some characters from other races or factions that play important roles, perhaps an Inquisitor who has an interest in the Dark Angels and their affairs, or an enemy chaos lord who is trying to bring down the Dark Angels. The relationships and interactions between these characters would drive the plot forward in the complex world of Warhammer 40,000.
The hero himself is surely a main character. There could be sidekicks or companions that the hero had before falling into the abyss and they might play a role in either trying to rescue him or having their own stories parallel to his. Also, there could be some powerful beings in the abyss that become important characters as the hero interacts with them.
Well, without having read it specifically, it might revolve around the typical vampire themes like the thirst for blood, the eternal life which can be both a curse and a gift. It could also be about the vampire's interaction with humans in the Darkness Falls area. It might have a plot that includes the vampire trying to hide its true nature from the locals or perhaps a love story with a human. There could be other supernatural elements in the story as well, like rival vampires or vampire hunters. And the setting of Darkness Falls could add an extra layer of mystery and danger to the whole vampire narrative.
There could also be new characters introduced in the fanfiction that interact with the main characters from the movie. For example, a local historian who has knowledge about the secrets of Darkness Falls and helps Kyle Walsh in his fight against Matilda Dixon. This kind of new character can add a fresh dynamic to the story and allow for different plot developments.
Since I'm not sure which specific 'darkness falls story' it is, it's hard to say exactly. But generally, there could be a hero or heroine who is trying to face the challenges that come with the darkness falling. There might also be a villain or some sort of antagonistic force that is causing the darkness or taking advantage of it.
In many such stories, there is often a powerful and seductive vampire. She is usually the one who initiates the relationship or draws in the other female character. For example, in some stories, she might be an ancient vampire with a tragic past. The other main character could be a more innocent or curious woman. She is attracted to the vampire's allure and danger. Their relationship then forms the core of the story, with all the conflicts that come from one being a vampire and the other being human or a less powerful being.
It could be the Hidden Leaf Village itself. If the village turns against Naruto through false accusations or unjust treatment, it becomes the force that drives him to the dark side. The elders or some of the more conservative ninja in the village who oppose Naruto's unorthodox ways could be the face of this antagonism.
The Ministry of Magic could be antagonists. If they start to oppress those with different views, including Harry, it could drive him towards darkness. Their corrupt and unjust actions might make Harry think that the only way to fight back is by using dark magic.
Since it's a novel about 'darkness', there could be a character who is initially innocent but gets drawn into the dark world. There may be a mentor - like figure who tries to guide this character out of the darkness. Or perhaps a group of characters with different motives, some good and some bad, all interacting in the setting of this 'darkness' that the novel portrays.
I'm not familiar with this particular novel. However, it might have a group of characters. There could be a mentor figure who guides the others through the darkness, and a villain who is somehow associated with or causing the darkness in the story.