What are the character traits of the people who live on Kreton's planet in the play, Visit to a Small Planet?

Like others who inhabit his home planet, Kreton never needs to eat, is immortal, and never has sex immortality has negated the need for reproduction, and their culture has eliminated passion (sex for pleasure) as a societal evil. Through the powers of their minds, they are able to read the thoughts of others, create invisible force-fields, and cause objects to levitate.