Since we don't have much information about the story, it could be anyone. It might be a fictional character created for the story, like a wandering minstrel who decides to take a break on the wall. Or it could be an ordinary person from the neighborhood, just looking for a quiet place to be.
The 'man in the wall story' could be various things. It might be a horror story about a man who appears in walls in a spooky, unexplained way. Maybe it's about a strange encounter where a figure of a man is seen emerging from or within walls, often associated with a sense of mystery and fear.
I'm not entirely sure as there could be various stories with this title. It might be about a man who is somehow associated with a wall, perhaps trapped inside it, or it could be a more symbolic story where the man represents something and the wall is a barrier in a metaphorical sense.
I'm not sure specifically what the 'wall man story' is as it could be a very unique or personal story. It might be about a man related to a wall in some way, like he could be a builder of walls, or perhaps a story where a man has an encounter near a wall.
The 'man lying on a wall story' could be a variety of things. If it's a local or cultural story, it could be related to traditions or superstitions. For example, in some cultures, there might be a belief that lying on a certain wall at a particular time brings good luck or wards off evil spirits. Or it could be a simple anecdote about a man who found an unusual place to relax, on the wall, and his experiences while there, such as the view he had, the people he saw passing by, and how he felt in that rather odd position.
If it's a horror - type 'man in the wall story', the main character could be the person who discovers the man in the wall. This character would be the one experiencing the fear and trying to figure out what's going on.
Since I don't know the specific story, the main character is presumably the man in the wall. He is likely the focus of the story, and whatever events or situations are described probably revolve around him.
Since I don't have the exact content of 'the man in the wall short story', I can only guess. It could be that the man in the wall has a unique ability or knowledge related to the wall. Maybe he's a guardian of the wall, or the wall holds some secrets that only he knows. The story might unfold as he reveals these secrets to others, or as others try to find out what he knows about the wall.
Not having read 'the man in the wall short story', it's hard to be definite. However, we know there's the man in the wall. There may be characters like a child who discovers the man in the wall and then tells their parents, which could lead to a series of events. Or there could be an old wise person in the story who has some knowledge about the wall and the man, and tries to offer advice or help regarding the situation.
The man could try to negotiate with the guy who trapped him. He could offer something in return for his freedom, like promising not to tell anyone what happened or offering some sort of valuable service. Or, if he's strong enough, he could try to break through the wall by using his body as a battering ram, especially if the wall is not very sturdy.