We have a forthcoming career promotion to our Warhammer characters soon as we are cashing in on a growing trail of professionally dispatched corpses as per the Skullbashers Direct customer commitment and I'll be mulling over the classes available to my Rogue. But as in D&Ds most recent incarnation there are archetypes that always present themselves in good narrative order and I think there might me merit in scrutinising where archetypes come from.
In the great tradition of great psychologists it seems that formative work in the field was done by Carl Jung and although masters of the mind exhibit both genius and insanity, the theories that stick will tend to have merit. More so Carl Jung as he founded analytical psychology but his approach to human archetype is rooted in anthropological imagery - cave paintings being the hominid evidence - recurring mental images or themes drawn from our evolutionary heritage - the foundations of mythology and art. The deep roots of archetype cannot be underestimated as the implication is that mental imagery processes came long before our higher functions in our Darwinian path which goes a long way to understanding the machinery of the unconscious and our shadow characteristics.
Im not going to attempt to digest the entire field in one paragraph but it does explain why roleplaying is so engaging, its not just an artistic side effect of exercising our imaginative muscles, it actually emerges from ancient and powerful mechanisms that idealise ourselves in different ways and generates an ethical scaffold to develop the best, or indeed worst of our characteristics - this imprints us somewhere on the lawful good/evil axes. Basically we are rolled up from the character classes that proceeded us.