The Question and Answer section for Pygmalion is a great resource to ask questions, find answers, and discuss the novel.
They are both concerned about social class and behavior. They wonder if they can make a "lady" out of a woman, Liza, who comes from low social status.
I would consider "social class" as the main theme. You can check it out at the GradeSaver link below:
There is alot of insight given.Your question is pretty broad. Please check out Liza's character at the link below: