Often, there is a lead scientist. This person is highly intelligent and is in charge of most of the research on the moon base. They are the one who makes important decisions regarding scientific experiments.
In some moon base novels, there is also a young and curious intern. This character brings a fresh perspective to the team. They might make some unexpected discoveries or get into trouble by exploring areas they're not supposed to, which then leads to new adventures and challenges for the whole moon base crew.
There are usually scientists as main characters. They are the ones who drive the research and exploration in the moon base. For example, Dr. Smith, who might be a geologist studying the moon's crust.
Since it's set in a moon base, the main characters could be people from different backgrounds and nationalities. There might be an experienced astronaut who has been on multiple space missions and serves as a mentor to the younger crew members. Another character could be a medical doctor who has to deal with the unique health challenges in space. And then there could be a communication specialist who is in charge of keeping the base in contact with Earth.
The creator of the 'nosleep moon base story' remains a mystery. It could have been a group of friends who were brainstorming ideas for a spooky space - themed story. Or perhaps it was a single writer who had a passion for both space exploration and horror. Since there are many creators on platforms like Nosleep, it's difficult to pinpoint the exact originator without further research into the specific story's history and any associated credits or author signatures.
The primary character is a space marine. He's a tough and fearless fighter. There may also be some supporting characters like scientists or other military personnel in the base who might get involved in the events, but the space marine is the central figure in the doom base story.
I'm not sure who the main characters in the Moon Palace Novel are as I haven't read it. But they could be a brave hero and a beautiful heroine.
Not having read the 'killing moon novel', I can only speculate. There might be a protagonist who has a special connection to the moon, either through some sort of power or heritage. There could also be antagonists who are either causing the moon to be 'killing' or are taking advantage of the chaos it creates. And perhaps there are supporting characters like friends or mentors who help the main character on their journey to deal with the situation regarding the killing moon.
Not having read the novel, it's difficult to say exactly who the main characters are. But it's possible that there is a young and curious character, maybe a child or a young adult, who is initially drawn to the mystery of the 'Heart of the Moon'. There could be an elder in the story, who has knowledge about the moon's secrets and guides the young character. And there may be a group of side characters, friends or foes, who interact with the main character throughout their exploration of the 'Heart of the Moon' concept.
I don't know the exact main characters in the 'Dark of the Moon Novel' since I haven't read it. But they could be the typical heroes like a brave young man or woman, or an old wise figure who guides the others.
Since we have no details about the 'shadow moon novel', the main characters could be a young protagonist with a special ability related to the shadow moon. Maybe there's also an old wise mentor figure who guides the main character in their journey involving the shadow moon. And there could be an antagonist who wants to use the power of the shadow moon for evil purposes.
I'm not sure as I don't know the specific 'Man on the Moon Novel'. But it could be astronauts, scientists, or even some fictional characters created for the story.