I'm afraid I can't say who the main characters are without more information about this 'a knock at the door novel'. However, it's common in such stories to have a protagonist who is affected by the knock at the door. There could also be the person or entity on the other side of the door. If it's a thriller, the main character might be a detective or an ordinary person caught up in a dangerous situation that starts with the knock.
The family members are the main characters, along with the four strangers who come to the cabin.
In this novel, the family in the cabin is among the main characters. We have the father, the mother, and their young daughter, each with their own distinct personalities and ways of dealing with stress. And then there are the four strangers. They are very different from one another, with different motives and personalities too. Their arrival at the cabin and the confrontation with the family forms the core of the story, and as the story progresses, we learn more about all of these characters through their actions and words.
There's a chance it could be a mysterious stranger. They might be on a journey and need a place to stay for the night. Or they could be bringing a warning or a message that will change the life of the person inside the house.
I'm sorry that I can't tell you the main characters in the 'knock knock comic full story' because I haven't read it. But in most comics, the main characters are often those who drive the story forward. They could be ordinary people with extraordinary abilities, or they could be from a different planet or time. In the case of this comic, we just don't know until we read it.
I'm not sure specifically as there could be many novels with this title. It might be about the anticipation and mystery that comes with a knock at the door. Maybe it's a horror story where the knock at the door signals the arrival of something sinister, or it could be a romantic encounter that begins with a knock.
Maybe it could be your grandma. Grandmas are often great storytellers. They have a wealth of life experiences and a bunch of interesting stories to share. When she knocks at the door, she might sit you down and start with a fairy tale from her childhood, like Cinderella or Snow White.
It could be a neighbor who just wants to borrow some sugar or salt. You know, a very common thing in a friendly neighborhood.
There's no way to accurately tell who the main characters in 'the knock short story' are without reading it. However, it's common in stories where a knock is a central element, that there might be a person living alone who hears the knock and has to deal with the fear or curiosity it brings. Or it could be a couple, and the knock creates a rift or brings them closer together depending on what lies behind the door.
Not having read the novel, I can only guess. There might be a brave explorer type of character who is drawn to the black door. There could also be a wise old mentor figure who tries to warn the protagonist about the perils of the black door. And perhaps there is an antagonist who wants to use the black door for their own evil purposes.
It often deals with mystery and suspense. You never know who's on the other side of that door and what it might lead to.