Scott, I took a college course on fantasy lit and and Campbell's influence was part of it. My paper however was on the "mentor" figure in these stories - Obi Wan, Gandalf, Uncle Ben, Dumbledore etc. This character is of course a parental figure but usually with special knowledge and/or wisdom imparted to the hero that is crucial to his or her development and success. Unfortunately, death is also usually in the cards for this character so that the hero is both motivated and has a path cleared to realizing their role as the primary power.