I'm not sure as I haven't read the specific 'the mystery man novel'. But usually in mystery novels, the main character could be a detective or an ordinary person who gets involved in mysterious events.
However, Jonathan Harker also plays a very important role. He is the one who first encounters Dracula and his journey into the vampire's lair sets the stage for much of the horror and discovery in the novel. So he could also be seen as a main character in many ways.
The main character is the Gray Man himself. He is a former CIA agent.
I don't know since I haven't read the book. But typically, the title suggests that the main character is a man in Moscow.
In the 'the november man novel', the central character is a man who was once part of the CIA. He has a certain set of skills and a past that are integral to the plot. As he steps back into the dangerous world of international intrigue, his character is developed through his interactions with old friends and foes alike. He has to face challenges that not only test his physical abilities but also his mental and emotional strength.
I'm not sure as I haven't read this novel specifically. But usually, the main character is someone who has a central role in the story's plot, perhaps a man with a complex personality and a lot of things going on in his life in Moscow.
Since I haven't read it, I can't say for sure. But as the title is 'the shipping man novel', it's likely that the main character is a man involved in shipping.
I'm not sure as I haven't read it. But since it's called 'A Man in Full', it's likely that the main character is a man, though without more information, we can't say more about his identity.
Not having read 'the mystery man short story', it's hard to be definite. However, it's probable that the mystery man himself is a central character. There could be other characters like a local journalist who is intrigued by this strange man and tries to dig up information about him. Or perhaps a young person in the town who stumbles upon the mystery man and becomes involved in uncovering his secrets.
It could be a superhero - like character with superhuman powers.
I'm not sure who the main character specifically is in this novel. But it's likely the 'man in the orange shirt' himself. Since the title centers around this person, it's reasonable to assume he plays a major role in the story.