Reason • [Archetype] • An Archetypal Character who represents the qualties of Logic and Control • The Reason Archetypal Character evaluates and acts solely on the basis of calm logic, never becoming enraged, passionate or emotionally involved in a decision. Although common in simple stories, the Reason character is hard to empathize with. As a result, it is one of the characters most often altered slightly from its archetypal arrangement to provide more potential for empathy from the audience. A frequent choice is to swap the trait of calm with the Emotional character’s trait of frenzy. The result is that both characters become more interesting, the Reason character being both logical and frenetic, the Emotional character being highly passionate yet in control

From the Dramatica Dictionary