There might be a local ghost hunter as a main character. This person hears about the haunted hamburger place and decides to check it out. They bring all their ghost - hunting equipment like EMF meters and spirit boxes. They start exploring the place, from the kitchen to the dining area, trying to communicate with any spirits that might be there. As they do this, they encounter all sorts of strange phenomena related to the hamburgers, like the smell of freshly cooked burgers when no one is in the kitchen or the sight of a ghostly chef making invisible burgers.
It could be the employees of the haunted hamburger joint. They would be in the middle of all the spooky happenings.
Well, perhaps there could be a story about a haunted hamburger joint where the burgers seem to move on their own at night. Maybe the patties start floating or the buns open and close mysteriously.
People who love horror and the supernatural would be interested.
I'm not sure specifically as I haven't read it thoroughly. But it could be the people who find or own the travelling bag.
In 'the haunted graveyard and other ghostly stories', there could be a variety of spine - chilling tales. There might be stories about how the graves in the graveyard seem to have an eerie glow at certain times. Some stories could be about the ghosts of long - dead soldiers still patrolling the area around the graveyard as if they are on guard duty. There could also be stories of people who have visited the graveyard and had strange encounters, like seeing a figure in a tattered burial shroud or hearing the sound of a long - forgotten funeral dirge.
Percy is surely one of the main characters since the book has 'Percy's Ghostly Trick' in its title. He is likely to be central to at least one of the stories.
It's possible that there are ghostly figures that can be considered main characters in their own right. For instance, the spirit that haunts the dolls house. This ghost might have a backstory that is slowly revealed throughout the story. There could also be a psychic or medium type character who is able to communicate with the ghosts and helps to uncover the secrets of the haunted places in the book.
Since I don't know the story well, the main character is probably the boy. There might be other characters like his family members who either support or oppose his hamburger - related activities. Maybe there's a burger chef who becomes his mentor.
There might be brave explorers who are curious about the haunted house. Also, there could be the previous inhabitants of the house whose presence lingers in a spooky way. And of course, there would be the people who are affected by the strange happenings in and around the house.
Since I don't know the exact 'the ghostly village story', it could be a group of explorers who stumble upon the village.
I'm not sure who the author of this work is. There are many books with similar titles, so it's difficult to determine without more information.