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.
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.
Since I don't know the specific story, it could be the star, who is likely a central character. And probably the neighbor who discovers or has a relationship with the star.
Since I don't know the story well, I can't say for sure. But typically in a story like this, there could be a protagonist who is very interested in the big door prize. There might also be an antagonist who tries to stop the protagonist from getting the prize.
There's no way to determine the main characters without more details about the story. However, common character types in such stories could be a curious child who is drawn to the green door, or a detective - like figure trying to solve a mystery related to what's behind the door.
I don't know as the information given is too limited. But it's likely that the girl next door is a main character, and perhaps there are also her family members, friends, or neighbors.
In the 'Barbie Secret Door Story', the main character is Barbie, of course. She is the one who discovers the secret door and enters the magical realm. There could be other characters such as a mischievous sprite that adds some fun and challenges to Barbie's adventures. Also, there might be a wise old owl or a kind - hearted deer that befriend Barbie and help her on her journey through this secret world.
There could be a neighbor as another main character. Maybe an older person who gives the girl advice, or a peer who becomes her friend or rival. For example, if it's a story about the girl's musical journey, the neighbor could be a retired musician who mentors her.