Since I'm not familiar with the specific 'one room light novel', the main characters could be various. It might be a reclusive writer who has his entire world within that one room, and his interactions with the delivery person who brings his supplies could be part of the story. Or it could be a sick person who is bedridden in that room, and the nurses or family members who visit are also important characters in the narrative.
Kiyotaka Ayanokoji is a main character. He is highly intelligent but keeps a low profile. Suzune Horikita is another important character. She is ambitious and determined to rise in the school rankings.
I'm not sure exactly as it depends on the specific 'the amber room novel'. But it could have a historian as a main character who is obsessed with finding the Amber Room. Maybe also a daring adventurer who joins the search.
Since I don't know the specific'spy room novel', it's hard to say. But usually, there would be spies, of course. Maybe an experienced spy who is the leader in the room, and a novice spy who is learning the ropes.
Lucy Honeychurch and George Emerson are main characters.
As I'm not familiar with the 'that night in room 401 novel', I can't say for sure who the main characters are. But based on the title, it could be someone who is staying in room 401 for the night. Maybe it's a traveler, a tenant, or a person seeking refuge. There could also be other characters who interact with this person during that night, like a hotel staff member, a neighbor, or an unexpected visitor.
I don't know for sure since I don't have details about this particular novel. It could be a young detective who is trying to solve a mystery related to the secret room. Maybe it's a family, like a brother and sister, who accidentally stumble upon the room and become the main characters in the story.
I don't know as I haven't read it, so I can't tell you who the main characters are.
I don't have enough information to tell who the main characters are in this novel. They could be ordinary people caught in extraordinary circumstances in the dark room.
I'm not entirely sure as I haven't read the novel specifically. But usually, there would be a protagonist who is ambitious and striving for success. There might also be characters who are already at the top, acting as either obstacles or mentors to the main character.
Since I don't know the specific 'war room novel', I can't say for sure. But they could be military commanders, intelligence officers, or politicians.