Given just 'the man story', it's hard to determine exactly who the main character is. All we can say is that it's a man, but we don't know his name, his age, or what he looks like. He could be anyone from any walk of life.
As we don't know the details of 'the man story', the main character is simply 'the man' in question.
Since we have no further information about 'the man story', we can't say more about the main character than that he is a man. He could be a young man starting out in life, an old man looking back on his experiences, or a middle - aged man in the midst of a crisis. There's no way to know without more details.
The main character in the 'man in the boat story' is the man in the boat, of course. He could be a person with a family waiting for him on land, which gives him the motivation to survive in whatever situation he is in while on the boat. Maybe he has a dream that he is trying to fulfill through his journey in the boat, or he could be running away from something in his past.
Obviously, the main character is the man on the hill.
Since I don't know the details of 'the sack man story', I assume the main character is the sack man himself.
As I don't know the specific 'banana man story', I can't say for sure who the main character is. But based on the name, it's likely that the 'banana man' is the main character.
Since I don't know the exact 'the clock man story', I can only assume that the main character is probably the clock man himself.
In the 'the falling man story', the main character is, as the title implies, the man who is falling. But depending on the nature of the story, there could be other characters that are central to the plot. If it's a story about the man's life before the fall, his friends or family members could be important characters. Or if it's a story set in a community, the people who witness the fall and are affected by it could also be seen as main characters in a broader sense.
Since we don't have the full 'donut man story', it's difficult to say exactly who the main character is. But it's likely to be the 'donut man' himself, whoever he may be in the context of the story.
Given the name 'man on the subway story', it's safe to assume that the main character is the man. He could be an ordinary person going about his daily routine on the subway, or he could be someone with a unique story or purpose related to his subway travels.
Since we don't know the exact 'man in the pit story', the main character is likely the man in the pit. He is the central figure around whom the story revolves.
Since the title just says'man in motion story', it's hard to tell exactly who the main character is. It could be an ordinary man with an extraordinary journey, or it could be a specific type of man like a salesman who is always on the move for work.