In the prequels, Yoda is shown to have the ability to "catch" Darth Tyrannus's Sith lightening. Mace Windu, who is supposed to be skilled in the dark arts, does not attempt this when confronting Palpatine. One of the popular theories behind the Palpatine/Sidious face-change was that Sidious was ancient and actually knew how to keep himself alive through the dark side, and that he used a "force-mask" to hide his true appearance which has been ravaged by the dark side itself. Or something like that. Given that Yoda is no doubt ancient and wrinkly, and that he looks just as much like a demon or gargoyle as he does a man, is Yoda supposed to be a former Sith? Could Yoda be a former human? I'm not a fan of the force-mask theory, but the fact that Yoda has no species seems to suggest there's a big secret behind his origins. The character of Yaddle complicates this line of thought, but doesn't derail it completely. I want to hear other peoples thoughts on Yoda's unique character, and hopefully a serious discussion about the dark side of the force as it is presented in the saga.