I'm not sure specifically who the main characters are in 'ghost stories third story' without reading it. But it could be a young person who is curious and gets drawn into the spooky events.
It's possible that the main character in 'ghost stories third story' is an outsider who has come to a new place. They might be more sensitive to the supernatural elements in the area. They could meet some locals who either help or hinder them in dealing with the ghostly events. For example, there could be an old wise woman who gives them some cryptic advice about the haunted place, or a group of kids who like to play pranks and make the situation even more confusing for the main character.
Maybe in 'ghost stories third story' there is a detective - like character who is trying to solve the mystery behind the strange happenings. Or it could be a family, with each member having a different reaction to the spooky situation.