The main character is Harold, as the title 'harold horror story' implies.
We don't really know much from just the title, but Harold is probably the central figure. He could be a child, a young adult, or even an older person. Maybe he has a special ability or a past that makes him the focus of these scary stories. For instance, he could be a psychic who attracts evil spirits, or perhaps he has unknowingly angered some sort of supernatural force.
The 'harold horror story' could be centered around Harold's encounter with the supernatural. Maybe he discovers an old, cursed object that brings a series of misfortunes and horror into his life. It could involve things like strange noises at night, shadowy figures following him, and a general sense of unease that builds as the story progresses.
Harold is the protagonist in the story of Harold and the Purple Crayon. He is a curious and creative little boy. With his purple crayon in hand, he is able to build entire landscapes, meet new characters, and go on all sorts of adventures. His character represents the power of a child's imagination, as he can literally draw his dreams and desires into existence using that one special crayon.
I'm not sure who exactly 'Harold' is in 'Harold Stranger than Fiction' without more context. It could be the main character perhaps.
The main characters are Harold and Maude. Harold is a young man with a strange fascination with death, and Maude is an elderly woman who has a zest for life.
The main character is the Sandman. In this horror story, he is not a friendly or benevolent figure. Instead, he brings fear and dread. He has this strange and somewhat otherworldly ability to interact with people during their sleep, which makes him a very effective horror character. His character design and the things he does make him the focus of the story's horror.
Since the title is 'the md a horror story', it's likely that 'md' is the main character. However, it's also possible that there are other important characters who interact with 'md' and play significant roles in the horror events that unfold. Maybe 'md' is a person who has a special ability or connection that draws the horror towards them or makes them the target of some malevolent force.
Maybe the main character is a detective who is investigating a series of strange disappearances related to the lollipop. He starts to dig deeper into the mystery and discovers that the lollipop is at the heart of a very dark and evil plot.
Since it's called the 'tristan horror story', it's likely that Tristan is the central figure. He's probably the one who the horror revolves around, whether he's facing monsters, ghosts, or other terrifying elements.
The main character in the Candyman horror story is, of course, Candyman. He is a menacing figure with a tragic past.