In some 'the ghost horror story' versions, it could be a family. Maybe a family who inherits an old estate and discovers that it's haunted. Each family member reacts differently to the ghostly encounters, which adds to the complexity and horror of the story.
Often, there's a protagonist who is new to a place, like a person who just moved into a supposedly haunted house. This character then has to face the manifestations of the ghost. There may also be a local character who warns the protagonist about the ghost but is ignored at first.
In 'the ghost story', the main characters could be the people who encounter the ghost. Maybe a group of curious kids or a brave investigator.
As I don't know the particular '1930 ghost story', it could have a protagonist like a young journalist who is investigating the strange happenings. There might also be an old caretaker of the haunted place who has some secrets.
The main character in the Ghost of Tsushima main story is Jin Sakai, a samurai with a strong sense of duty towards his homeland. His uncle, Lord Shimura, is an important part of the story. Lord Shimura represents the traditional samurai values. Another important character is Yuna. She is a thief - turned - ally of Jin. She has her own skills and knowledge of the island which prove invaluable to Jin in his fight against the Mongols. There are also Mongol characters like Khotun Khan, who serves as the main antagonist, driving the conflict in the story.
Since I don't know which 'original ghost story' you mean, it could be a brave hero or heroine who tries to face the ghost. Maybe there's also an old wise person who gives advice on how to deal with the supernatural.
Without more information on 'the ghost love story', it's difficult to name the main characters. However, it could be a pair of star - crossed lovers, one of whom has passed away and become a ghost. Maybe there are also some side characters like a psychic who tries to help or a villain who wants to keep the lovers apart.
I don't know the exact main characters in the 'ghost giant story' since I don't know the specific story. But it could be a brave hero who tries to face the ghost giant, or a group of villagers who are affected by the ghost giant's presence.
Since I don't know the specific 'Ghost of War Story', I can't say for sure. But it could be the ghost itself as a main character. There might also be soldiers, either living ones who interact with the ghost, or the memories of the dead soldiers that the ghost represents.
Typically, the main characters could be the family or people who live in the haunted house. They are the ones who experience the strange happenings related to the ghost.
Most likely, the main character is the ballerina who becomes a ghost. There could also be other characters like her dance instructor who might have witnessed her transformation into a ghost or other ballerinas in her troupe who are affected by her ghostly presence.
Again, without more details about the specific 'ghost patrol story', it's hard to say. But it could be the members of the ghost patrol team.