There might be other characters that she observes from the window. They could be neighbors or passers - by, and while not as central as the woman, they play a role in her story as the objects of her observation.
The main character is the woman in the window. There could be a nosy journalist who gets wind of her story and decides to dig deeper. And there might be a family member who has abandoned her and whose actions led to her current situation, being in that window all the time.
The main character is the woman who lives in the house and looks out the window. There are also some neighbors who play important roles as the story progresses.
The main character is the woman who is confined to her home because of her agoraphobia. She is the protagonist around whom the whole story revolves. In addition to her, there could be characters like the delivery person who might come to her door, or the neighbors she spies on from her window. These characters play important roles in the story. For example, the neighbors' actions or behaviors might be what lead the woman to suspect a crime, and the delivery person could be a link to the outside world that the woman is so isolated from. Their interactions, real or imagined by the woman, are what make up the fabric of the story.
I'm not sure specifically as I haven't read it in detail, but surely the man by the window is one of the main characters.
The main characters are usually a young girl and a visiting gentleman. The girl is the one who tells the story, and the gentleman is the recipient of her rather strange and spooky tale.
Since I haven't read the actual story, it's hard to say exactly. But it could be the patients in the hospital rooms with a view of the window. Maybe there are also nurses or doctors who interact with the patients and are somehow related to what the patients see or experience through the window.
Typically, in such a story, there would be the observer of the face in the window as a central figure. This character would be the one through whose eyes we experience the events. There could also be other supporting characters like family members or friends of the observer who might either believe or not believe their story about the face. The person behind the face, if it's not a supernatural entity, could also be a main character with their own motives.
The main characters are Vera and Mr. Nuttel.
The main characters are Mort Rainey, a writer, and John Shooter, the man who accuses Mort of plagiarism.
One possible theme is the allure of the unknown. Since she is looking out the window, she might be attracted to the things she doesn't fully understand that are happening outside. It shows human curiosity.