Since the title is 'the fat man horror story', the main character is likely the fat man himself.
Since I don't know the story in detail, I can't say for sure who the main character is. But from the title, it seems that the 'fat man' is likely to be the main character.
Well, from the name'magically blimped out fat man story', it seems that the central figure is the fat man. He is the one who has presumably undergone some magical change that has made him 'blimped out'. However, without more details about the story, we can't say if there are other important characters who interact with him or influence his situation.
The main character is most likely the grinning man himself. He is the source of the horror in the story.
Most probably, it's the laughing man. Since it's a horror story named after him, he would be the central figure, driving the plot with his menacing actions and that spine - chilling laughter.
The main character is the Muffin Man. In the horror context, he becomes a source of fear. He could be a deranged baker with a twisted mind. Maybe he uses his muffin - making as a cover for his more sinister activities. He lures people, perhaps children, with the promise of delicious muffins, but in reality, he has much more malevolent intentions.
Since not much is known about the story, it's hard to say who the main character is. But it might be the thin man himself.
It could be that the main character is an investigator or a journalist who hears rumors about the strange happenings related to the muffin man. They go to the town or place where the muffin man is said to be and start to dig deeper. As they uncover more about the muffin man's dark secrets, they become the target of his wrath. This character then has to fight for their survival against the muffin man and the supernatural forces at work in the story.
The main character is likely the Green Man himself. He is the source of horror in the story.
The main character in 'the smiling man horror story' is, of course, the smiling man himself. He is the source of all the horror and fear in the story.
The dancing man is clearly the main character. He drives the plot forward with his menacing presence. While there might be other characters in the story who are affected by him, it's his actions and his very existence that create the horror. He is the central figure around which all the terrifying events revolve.