Carl Jung’s theory of archetypes.
English: Hand-colored photograph of Carl Jung in USA, published in 1910. (Photo credit: Wikipedia)
Carl Jung has a theory. The human psyche, no matter how different and versatile could be roughly divided into 12 categories and 4 types. If you are interested in learning more about these archetypes feel free to read this essay by Carl Golden. As Carl Golden points out these archetypes can be used in the creation of characters. I would suggest everyone gives it a read as it can be inspiring. I don’t consciously label my characters as a certain archetype because I feel like categorizing characters can feel limiting. Still I agree that it can help using these to craft new characters.