Obviously, the dancing girl is one of the main characters. But we don't know if there are others without more details about the story.
The dancing girl is the central figure. There might be a teacher or a mentor figure in the story. This person could be crucial in her development as a dancer, guiding her and teaching her new techniques. There could also be her family members, like a mother or father, whose attitudes towards her dancing play a part in the story. For example, if they are against it, it creates conflict for the dancing girl.
Maybe there are other characters like an audience. In a story, the reaction of the audience to the dancing girl's performance can be important. There could also be a love interest. For example, a young man who falls in love with her at first sight when she is dancing on the stage. And perhaps there is a rival dancer who is jealous of her talent and tries to undermine her.
I'm not sure specifically without having read the novel, but it's likely that the dancing girl is one of the main characters. There might also be a love interest, like a young man who is drawn to her because of her dancing or her unique charm.
The main characters in this short story are the twelve princesses. They are the focus as their nightly dancing and the resulting worn shoes are what drive the plot. The king, who is their father, plays a major role as he tries to figure out what his daughters are up to. And there's the smart young man. He is the one who manages to solve the mystery. Without him, the mystery would remain unsolved and the story would be incomplete.
Since we don't know the exact 'dancing girl story', it's hard to say. But generally, there would be the dancing girl herself as the main character. There might also be a teacher or mentor who helps her improve her dancing skills.
The main characters are the twelve princesses and the soldier. The princesses are at the center of the mystery as their nightly dancing is what needs to be explained. The soldier is the one who takes on the challenge of solving the mystery.
Since I don't know the exact story, it could be a young couple as the main characters. They could be the ones enjoying the moonlight dance together.
Since we don't know the details of the 'dancing in the dark story', it could have a young girl as the main character. She might be using dancing in the dark as a way to deal with her inner turmoil or as a form of rebellion against a strict upbringing. Or perhaps it's an older man who has rediscovered his love for dance in the twilight of his life and prefers the solitude of dancing in the dark.
It depends on the specific version of the story. It could be a foolish man who is the main character as he is the one who decides to dance with the devil.
The girl could be a symbol of humanity in general. In this story, she stands for all those who are faced with the choice between good and evil. It doesn't matter who she is specifically, but rather what she represents in the context of the story about dancing with the devil.
The main character is surely the girl on the train. There may also be other passengers or train staff that could be considered important characters depending on the story.