I'm afraid I can't name the main characters without more information about the 'the door game story'. There could be a brave hero, or a group of friends, or even some magical creatures, but it's all speculation at this point.
I'm not entirely sure about all the main characters, but there's likely a protagonist who is brave enough to explore the spooky settings. Maybe there are also some side characters who either help or hinder the protagonist's journey.
There could be a curious child as one of the main characters. This child is always exploring and it's their inquisitiveness that leads them to the secret door.
Since I don't know the exact 'door man story', it could be the doorman himself as the main character. There might also be some regular visitors like a kind old lady or a busy businessman who interact with him a lot.
I don't know since I don't have details about this specific 'the secret door story'. It could be a young adventurer, an old wizard, or just an ordinary person who stumbles upon the secret door.
As we lack information about 'the black door story', the main characters could be numerous. It could be a detective - like character who is trying to solve the mystery of the black door. Maybe there are some local villagers who are scared of the black door and its implications. There could also be a shadowy figure that guards the black door, and the story could revolve around the interactions between these potential characters.
Obviously, the boy next door is one of the main characters. There might also be the narrator, who could be a neighbor or someone who has a close relationship with the boy next door.
Perhaps the main characters are hunters or trappers who find themselves in a situation where wolves are at their door. They could be experienced outdoorsmen who have to use their skills to deal with the approaching wolves. There might also be local villagers who are affected by the presence of wolves near their homes and are the central figures in this true story.
As I don't know the story, it could be the parents in the family next door, their children, or maybe even the family pet.
I don't know since I haven't read it. Maybe there's a protagonist who has a special connection to the red door.
There is likely a main character who is the one to first encounter the door in the wall. This character is probably going through some sort of internal struggle, perhaps feeling unfulfilled in his normal life. And then there could be other characters who either don't believe in the existence of this door or are envious of the main character's discovery. For instance, there might be a friend or a family member who dismisses the idea of the door as a childish fantasy, which adds to the conflict in the story.