This is something I've been wondering.......does turning to the Dark Side of the Force fundamentally alter a person, especially how they are perceived by other Force-sensitives? Yoda and Ben Kenobi were 100% positive that Vader was un-redeemable. They were convinced that the change to Dark Lord of the Sith was permanent and irreversible. Of course, we know that this isn't true, but why were they so certain? - Sith traditionally take another name; is this more than just ceremony? Is there a fundamental change in their perspective guided by the Dark Side? - Is turning to the Dark Side like a cascade event that overwhelms the personality of the person turning? - To a Jedi observer, would a person turning to the Dark Side be transformed, like Jekyl and Hyde? Luke's big discovery was that a Sith could be turned to the Light Side - or at least Vader could be. To a Sith observer, would that transformation be just as dramatic as going the other way?