Forum:KB Archive: A user of both the Dark and Light Sides

I've been reading a lot of pages and article's on here lately. Who knew the Star Wars Legacy stretched this far. Anyway, I've been wondering (As nothing has come up from the articles I've read) Has there ever been a person that has demonstrated the uses of both the Dark and Light Sides of the Force? And I don't mean starting a Jedi and turning to the Dark side.