Without reading 'the house game story', it's difficult to determine the main characters. They could be a family who plays the game in their house. So there could be a mother, father, and their children. Or it could be a group of friends who gather at someone's house to play the game. In that case, there would be different personalities among the friends as the main characters.
I don't know as I haven't read the 'the house game story'. It could be kids, adults, or a mix of both.
There could be a detective - like character in the 'the house 1 game story'. This character is called in to solve the mystery of the house. Maybe there have been disappearances or strange occurrences in the house, and the detective is there to piece together the clues, talk to the neighbors who might have some information about the house's history, and ultimately solve the mystery that lies within the house.
The main character is the protagonist who is trapped in the Witch House. There might also be some sort of dark presence or the witch herself that is sort of an antagonist in the story.
Since I don't know the details of the story, I can't say for sure. But it could be the people who own the lake house, or visitors who come there for different reasons.
Puzzles might be a key element. They could be used to unlock new areas or reveal parts of the story. For example, finding a combination to a locked chest. Another element could be characters. There may be characters within the house, either friendly or hostile, that the player interacts with to progress the story.
The main characters are Roderick Usher and his sister Madeline Usher. The narrator is also an important part as he witnesses the events in the House of Usher.
Perhaps there is a family that used to live in the house before all the horror started, and they are now either victims or part of the mystery. There might also be a local detective or investigator who is trying to solve the strange happenings in the house.
The main character is most likely the house boy. However, there could be other important characters too. If it's a story about his growth, perhaps a wise neighbor who gives him advice from time to time could be an important character. Also, if there are any pets in the house, they could also play a significant role in the story as the boy's companions and part of his daily experiences in the house.
I'm not sure specifically as there are many possible Monster House stories. But it could be a group of curious kids who are the main characters. They might be the ones to discover the secrets of the monster house.
Since I don't know the specific 'house of darkness story', I can't say for sure. But it could be a brave explorer who ventures into the house, a family that moves into the house and starts experiencing strange things, or a ghost hunter who is there to investigate the dark secrets of the place.
There might be the people who live in the little house, if there are any in the story. They would be important characters as they interact with the house and are part of its story.