The main character is obviously the man who knew too much. There might also be the people who are after him, like some villains or agents who want to keep the secret he has uncovered.
The central character is the man with the excessive knowledge. He is likely to be an ordinary person who stumbles upon this knowledge by accident. Then there could be other characters such as those who are involved in the secret that he has discovered. They would be the antagonists, trying to stop him from doing anything with the knowledge. There might also be some side characters, perhaps a friend or a family member of the man, who get dragged into the situation because of his discovery.
As I haven't read the story, I can't say for sure. But the main character is likely the girl the title refers to. There might also be other important characters like her parents, friends, or a love interest who play significant roles in her story.
The main theme could be the danger of having too much knowledge or the powerlessness that comes with it.
In 'the man who knew too much short story', the plot likely centers around a man obtaining knowledge that is not meant for him. This knowledge could be about a political conspiracy, for example. As he becomes aware of it, he finds himself in a difficult situation. He may try to figure out what to do with this knowledge, whether to expose it or keep it to himself, all while being in danger from those who don't want the information to get out.
The Illustrated Man himself is the central character. He is a man covered in tattoos that tell stories.
Since I don't have the full story, it's hard to say exactly. However, if it's a typical short story, the main character would be the 'happy man' of course. He could be surrounded by other characters such as a wise old man who gives him advice on happiness, or a young child whose innocence makes him reflect on his own happiness. There could also be a love interest, a woman who plays a role in his emotional state and his perception of happiness.
Well, one main character is surely the man in the moon. There might also be other characters depending on the story. Maybe there are some lunar creatures or other people who are somehow related to the man's adventure on the moon.
The main characters in 'the third man short story' are the ones that the story revolves around. You have the character who is sort of the central figure, let's call him Character A. He's likely in a certain situation, maybe he's in a new town or starting a new job. Then there's Character B, who is connected to Character A in some way, like they are neighbors or colleagues. And finally, the third man, who is the wildcard. He might be a figure from the past of either Character A or B, or he could be completely new and bring a whole new set of problems or revelations.
I don't know for sure as I haven't read it. But surely there is the silent man himself. There might also be people around him like his family members, friends or colleagues who play important roles in the story as they interact with him and are affected by his silence.
The main characters are likely the man and perhaps the wood itself could be considered in a way as it seems to be an important part of the story.
I'm not entirely sure without reading it again, but usually there would be the person who discovers the petrified man. There might also be some local characters like the town's gossip or an authority figure who has to deal with the situation.