In Dramatica Story Theory, a “Physics” Main Character is a person of action. For example, he might be doing something just to do it, or he might be trying to obtain or achieve something. Other activities of a Physics Main Character might be learning or seeking to understand something. At first learning and understanding might seem too internal to be Physics, but consider that these activities are applied externally. Learning is gathering information about something and understanding is seeking the meaning of something. This is quite different than coming up with original thought which would be internal.

From the Dramatica Theory Book