The main character is surely the man in the restroom. But we can't rule out the possibility that there are other characters that are important for the development of the story. In some cases, there could be a janitor who has a connection to the man in the restroom. Maybe the janitor has some knowledge or secret related to the restroom that impacts the man's experience. Or there could be a friend or acquaintance of the man who has something to do with why the man is in the restroom in the first place or what happens to him while he's there.
The main character is likely the man in the restroom. However, depending on how the story unfolds, there could be other characters who play important roles as well. For example, if it's a story about a man being haunted in the restroom, there might be a ghost or some other entity that also has a significant presence in the story. Or if it's a story about a man helping someone in the restroom, then the person he helps could also be considered a key character in a way.
I'm not sure specifically which 'the man in the restroom story' you're referring to. There could be many different stories with such a title. It could be about a man having an unusual encounter in the restroom, like meeting a strange person or finding something unexpected there.
As we don't know the details of 'the man story', the main character is simply 'the man' in question.
Once I was in a coffee shop and there was a unisex restroom. I saw two guys go in one after another. When I went in later, I noticed some cute little notes on the mirror. It seemed like they were from one of the guys to the other, with little hearts drawn. It was really a sweet and unexpected discovery in a restroom.
Since I don't know the exact 'lamppost man story', the main character is probably the man who is associated with the lamppost in some way.
Since we don't really know the specific 'hatchet man story', it's hard to say who the main character is. It could be the hatchet man himself, if the story focuses on his actions and motives.
The main character in the 'Lawnmower Man Story' is probably the man who mows the lawns. He is the central figure around whom the story revolves. Whether he's a simple working - class guy just trying to make a living or a more complex character with a backstory and dreams related to his lawnmowing job, he is the one the story is mostly about.
The main character in the 'whistling man story' is most probably the whistling man. However, depending on the nature of the story, there could be other important characters as well. For instance, if it's a story about how the whistling man's whistling affects those around him, there could be people in the community where he lives who are also important characters in the story. They might be initially annoyed by his whistling, or they might be intrigued and become his friends or followers. The whistling man could also have a backstory that involves other characters, like a mentor who taught him how to whistle in a special way or an antagonist who tries to stop him from whistling for some reason.
Since we don't know the specific 'a drowned man story', the main character is most likely the drowned man himself. He would be the central figure around whom the events of the story revolve.
As the title implies, the main character is the man in the tunnel.
The main character in the 'the skeleton man story' is most likely the skeleton man himself.