There might be a young apprentice as the main character. They are just learning about their magic abilities, especially the magic missile, and they are thrust into a situation where they have to face the darkness. There could also be a mentor figure in the background who has taught them about the magic missile, but is now unable to directly help them in the fight against the darkness.
I'm not sure specifically as the title is rather unclear. It could potentially be a story about using magic missiles to combat darkness, perhaps in a fantasy setting where a character has the ability to cast magic missiles and is on a quest to dispel some sort of dark force or entity.
In some 'darkness is magic' fanfictions, there could be a group of characters who are all affected by the presence of dark magic in different ways. One might be a healer who tries to counter the negative effects of dark magic, another could be a thief who uses dark magic for stealth and thievery. These diverse characters would interact and their stories would unfold, with the theme of dark magic binding them all together.
There's no way to accurately name the main characters without having read the 'In Darkness 2018 Story'. However, in a story about 'darkness', it's common to have a central figure who is in the middle of the turmoil. This character could be an everyman type, someone who the readers can easily relate to. There might also be antagonists, perhaps people or forces that are causing or contributing to the 'darkness' the protagonist is facing.
I'm not sure who the main characters are without more information. It could be a group of brave explorers or just one person on a solo journey into the darkness.
Maybe there is a protagonist who has some special ability to combat the darkness, and there could also be some side characters who either help or hinder the protagonist's journey in the 'the darkness 1 story'. Without more context, it's difficult to be more precise.
Since I don't know the details of the 'darkness 2 story', I can't say who the main characters are.
Since I don't know the exact 'the darkness story', it's hard to say. But it could be a lone hero who has to face the terrors of the darkness. Maybe it's a young child who is the only one seeing the strange happenings in the dark.
Perhaps there is a wise old character who serves as a guide in the face of the darkness. And there might be a villainous character who is somehow associated with the source of the darkness. It's common in stories for there to be a contrast between different types of characters in relation to a central concept like the darkness in this story.
There's no way to tell without more information about the 'rid the darkness story'. It could have a single hero as the main character, like a brave knight or a powerful wizard. Or it could be a group of characters, perhaps a family or a band of adventurers.
I'm not sure specifically as it depends on the particular version of the story, but usually there is a central character who drives the plot forward.