Since we have no details about the story, it could be that the main characters are a group of diverse guests. There might be a character who is the instigator of the game among them. There could also be a character who is reluctant to play the game at first but then gets drawn into it. Maybe there is a mysterious guest who has a hidden agenda related to the game.
I don't know as I haven't read the story. But it could be the guests themselves, perhaps there is a host who also plays an important role.
Since I don't know the exact 'guest short story', it's difficult to say. But it's likely that the guest is one of the main characters. There could also be a host or other people who interact with the guest, like the family members of the host if it's a story set in a domestic environment.
Typically, in a 'the christmas guest story', there would be a family or a person who is preparing for Christmas. Then there is the special guest. This guest could be someone from afar, perhaps a traveler, or someone with a unique story. There might also be other supporting characters like neighbors who interact with the main characters during the Christmas events in the story.
Since I don't know the exact 'guest book story', I can't say for sure who the main characters are. It could be the guests who write in the guest book, or it could be the owner of the place where the guest book is kept.
It could be a mysterious figure from another dimension. In a more fantastical version of the story, this uninvited guest could be a being that has accidentally slipped through a portal during the game. They have no idea about the world they've entered or the rules of the game, but their presence causes all sorts of strange things to happen.
I'm not sure specifically without reading the story, but it could be a family that is hosting the Christmas guest. There might be a mother, father, and some children.
The main characters are the ambitious guest, of course. And then there is the family that he encounters. There is the father, the mother, and the children in the family.
Since it's a family dungeon guest story, the main characters are likely to be the guest, and then the family members who are related to the dungeon. Maybe there's an old patriarch or matriarch who has a special connection to the dungeon and its secrets.
Well, the most obvious main characters would be the house guest and the host. The house guest could be a traveler, a friend in need of a place to stay, or someone with a mysterious purpose. The host could be a single person, a family member, or a couple. There may also be secondary characters such as a maid or a pet in the house that could add to the story's complexity, but again, this is all based on general assumptions about this type of short story.
As I don't know the 'the unforseen guest full story', I can't tell you the main characters. But usually, the title might suggest that the unforseen guest is one of the main characters. There could also be other characters who interact with this guest, like the host or people in the place where the guest arrives.
I'm not sure as I haven't read the story, but usually there would be the host or hosts and of course the unexpected guest.