I'm not sure specifically who the main characters are in the Mirror Game Story without more details. It could be children who are curious about the mirror game.
Often, there is the person who witnesses the ghost in the mirror. This could be just an ordinary person living in a spooky old house or a curious teenager exploring an abandoned place.
It depends on the specific mirror story. It could be a person who discovers a strange mirror, like a curious child. So the main character would be the child.
Given the lack of details, the main characters could be diverse. It could be a couple, where the mirror plays a role in their relationship, like showing their true feelings for each other. Or it could be a reclusive artist who uses the mirror as a source of inspiration and the story could be about their creative process and how the mirror impacts it.
Often, there is the person who owns or encounters the mirror as a central character. In some mirror horror stories, there might also be a previous owner whose actions or misdeeds are somehow related to the mirror's cursed nature. For instance, an old man who was into dark magic and used the mirror for his evil rituals, and now the mirror is passed on to an unsuspecting person who has to deal with the consequences.
I'm not entirely sure as there are different storylines in Black Mirror 2. But usually, there are characters who are ordinary people caught up in extraordinary technological situations. Maybe a young tech - savvy person who discovers a new app with dark secrets, or an older person trying to adapt to a world that is rapidly changing due to new technology.
Without reading the actual 'the mirror image short story', it's difficult to say for certain. However, in similar stories, there is often a central character who has some sort of internal conflict related to the mirror image. This character could be male or female, of any age really. There might also be a mysterious figure that appears in the mirror, which could be considered a character in its own right. This figure could either be a projection of the main character's subconscious or something more supernatural, adding to the mystery and driving the plot forward.
The main characters are Matt and Joe. Matt is kind of a tech - savvy guy who gets involved in some really strange and dark situations with the technology around Christmas. Joe, on the other hand, has his own set of problems related to the technology and how it affects his life during that time of the year.
I don't know the exact main characters in this story since I haven't read it. But surely, the girl herself is a main character. There might also be other characters like her family members or friends who could be related to her situation with the mirror in some way.
Often, there is a protagonist who discovers the magic mirror. This could be a young person, like a curious girl or boy.
Since I don't know the exact story, I assume the main character would be the woman who experiences the mirror swap. There might also be other characters like her family members or friends who notice the change in her after the swap.