Since I don't know the exact story, the main character is probably the 'biscuit man' himself.
I'm not sure specifically which 'biscuit man story' you are referring to. There could be many stories related to a biscuit man. It might be a local folktale where a man who makes or sells biscuits has an interesting adventure, like he might have a special recipe that he uses to save his bakery from closing down.
If the 'biscuit man story' is about sharing, like the biscuit man giving his biscuits to the needy, then the moral could be about the joy of giving and kindness.
I'm not sure specifically as there could be many different 'biscuit man' stories. It might be about a man who makes or sells biscuits, perhaps with some adventures or interesting events related to his biscuit - making or selling business.
Obviously, the little girl is one of the main characters. She is the one directly related to the biscuit.
As we don't know the details of 'the man story', the main character is simply 'the man' in question.
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.