Additional Thoughts: Star Wars

The temptation is so strong to introduce a character as an archetype, and expand the character from there to OUTSIDE the archetype, for fear of cliché.

I would say within an individual movie, stick to the archetype.  Unless you are using the switch as a twist in your story, in which case be careful to avoid all the pitfalls that come with that, such as consistency issues.

Going from one movie to another, it is okay to demonstrate a character's growth by showing that he or she is now an entirely different kind of character.  However, don't do this just for its own sake.  It must serve the story, otherwise it's entirely meaningless.

This has been Additional Thoughts with Big Shot Critic