Equivalent to the genetic or inherited aspect of character. Lying in the body. The biology of character. Relatively unchanging throughout the life of a character. Approachable through non-linear methods and sources of inspiration such as masks, the elements, animals, rhythms, walks, costume etc. Doesn't take into account a character's acquired system of beliefs.
Although an essential part of all forms of characterization, when it is the primary aspect, as in commedia dell' arte, the results are often directly effective, easy to recognize and identify with, propelled by basic appetites, and delightfully naïve. Such characters may be considered simple.