Stories About Men- Children (or Women-Children)

How do we understand the experience and behavior of a person who is physically an adult but still thinks and feels like a child? What can we expect of such an individual when given great power either through inheritance or by social situations of varying sorts? Can we describe the type of logic utilized by such people with the theories of developmental psychology? What might a man-child experience and what might happen to him or her once he assumes a position of great power and the responsibilites that go with such power? What can happen to families, social groups and whole societies if and when the behavior of a man-child becomes normative to these groups?