There's no way to tell precisely who the main characters are in 'hold the dark story' without more information. However, it's likely that there would be characters who are either victims of the dark forces in the story or those who are trying to fight against it. Maybe there's a protagonist who is on a journey to uncover the truth behind the darkness and in the process, meets other important characters who either help or hinder this quest.
In the 'hold the dark story', the main characters are quite a mystery. But if we think about common elements in such stories, there might be a central character who is drawn into the dark situation against their will. This character could be an ordinary person, like a journalist or a small - town resident, who stumbles upon the dark secret or phenomenon. Then there could be other characters like an old hermit who knows some of the secrets about the dark but is reluctant to share, and a villain - like figure who is either causing the dark or trying to use it for their own gain.