Another common type of main character could be a paranormal investigator. They are attracted to the house because of its reputation for being haunted. Their scientific or not - so - scientific methods of dealing with the supernatural events in the house can be an interesting part of the story.
There might be a reclusive neighbor who has some knowledge about the house's secrets. This character could add an air of mystery and suspicion. And perhaps a local historian who tries to help the main characters understand the history of the haunted house.
One of the main characters is Johnny Truant. He discovers the manuscript about the house and his life becomes intertwined with the strange events of the house.
Sometimes it's a family that moves into the house not knowing it's haunted. There's the parents and their children, and they start experiencing all kinds of terrifying things. For instance, the children might see strange shadows at night, and the parents try to figure out what's going on while also protecting their family from the unknown threats in the house.
Maybe there's a curious explorer who ventures into the empty house. He or she is the main character who starts to experience all the horror.
I'm not sure specifically as I don't know the exact 'Red House Horror Story', but it could be the family who moves into the red house and experiences the horror. Maybe there's a young girl who is more sensitive to the spooky happenings and is the first to notice the strange things going on.
One of the main characters is Johnny Truant. He's a very complex character.
Ben Harmon is also a main character. He is Vivien's husband and they both face numerous horrors together in the house. He is a psychiatrist which adds an interesting layer as he tries to rationalize the supernatural events with his knowledge. There are also other characters like Constance Langdon who is a rather complex and spooky neighbor. She has her own secrets and connections to the house.
Constance Langdon is a key character. She has a deep connection to the Murder House. She's sort of like the keeper of the secrets of the house. She knows about the ghosts and the history of the murders that took place there. And she's always around, meddling in the affairs of those who enter the house.
Vivien Harmon is one of the main characters. She moves into the Murder House with her family and experiences all sorts of horrors.
One of the most memorable is Violet Harmon. Her struggle with her own identity and the horrors she faces in the house make her stand out. She has a complex personality and her story arc is really engaging.
The most obvious horror element is probably the house itself. It might be a place filled with dark corners, strange noises, and an overall sense of dread.