How did the role names of "Sheng, Dan, Jing, Mo and Ugliness" come from in China's traditional operas?

I think the names of these characters are all short names of the characters in the play. Each character represents a kind of character, so there will be different titles. We should all know that role is a kind of positioning and division of labor for actors according to the differences of their identity characteristics and performance styles on the stage.

In China traditional operas, there are many kinds of characters, which leads to many names. Considering that the people engaged in the traditional Chinese opera industry at that time had a low level of education, the names of these characters were as simple as possible to prevent mistakes because of the complicated fonts. Sometimes even some strokes are removed from the original characters and used as simplified characters. So there are simple and easy-to-remember names, such as fate, Dan, Jing, Mei and Ugliness.

In fact, it can be analyzed in this way, such as the clean corner, whose meaning is actually relatively simple and clear. Many dramatic actresses need make-up before going on stage. Before painting, they need to wash their faces and shave. The whole process is expressed in a clean word. Similarly, the last corner is also the last general. In this way, opera actors can better understand their own roles.

But in the previous society, there was a folk saying about the origin of characters, which was that they came from ancient geisha. They use technology to decide whether to win or lose, and take it as an excellent standard. Later, people who take color and art as their profession, such as actresses, were collectively called roles and divided into many categories, so the saying "Twelve Roles in Liyuan" came into being by chance. Whether it is fate, Dan, Jing, Mo and Ugliness, they all have their own merits. A good opera also needs their cooperation to complete.