One possible theme could be redemption. If the ghost, Blackwelder, had made some mistakes in life, its mission in the afterlife could be about redeeming itself.
I'm not really familiar with a specific 'a ghost with a mission blackwelder ghost story'. It could be a very unique local or self - created ghost story. Maybe it involves a ghost named Blackwelder that has some sort of mission, like avenging a wrong or protecting a certain place.
Another theme could be fear. Ghost stories are often about creating fear, and in '222 the ghost story', the unknown elements related to '222' might be used to instill fear in the readers or listeners. For example, if the ghost always haunts at 2:22, that specific time can be a source of fear. Also, the presence of the ghost in the story would naturally bring a sense of dread and unease.
One possible theme could be the fear of the unknown. Since it's a ghost story, the mystery surrounding the ghosts and their existence can create a sense of unease.
One possible theme could be isolation. If the boy is a ghost or has ghost - like qualities, he might be isolated from the normal world.
One possible theme could be revenge. If the ghost in the story is that of someone who was wronged, they might be seeking revenge on those who caused their misfortune.
One possible theme could be fear. Since it's a ghost story, Cheryl might be constantly afraid of the unknown and the ghostly apparitions she encounters.
One possible theme could be fear. Ghost stories are often centered around instilling fear in the readers, and if 'windover' is a spooky place, it can be a great source of fear.
One possible theme could be revenge. If the cockfighter was wronged in some way during his life, his ghost might be seeking revenge on those who did him wrong.
The themes could include mystery. We don't know much about Charlie as a ghost, so there's a sense of mystery around him. Also, loneliness could be a theme. Maybe Charlie is alone as a ghost and is longing for some kind of connection, which is why he interacts with the living in the story.
One possible theme could be the clash between the modern world and traditional beliefs. The characters in the story might be modern - day people living in or visiting Chinatown who are suddenly confronted with the reality of ghosts, which challenges their rational thinking. Another theme could be the idea of unfinished business. The ghosts might be there because they have something left undone in their lives or deaths, and the story could revolve around helping them find closure.