It turns out the bad guy was pulling your strings like a puppet and has made you help him out.
You ARE Revan.
But, really, all these can be summarized as "something turns out not to be what it initially appeared to be in a dramatic fashion". Isn't that the definition of a plot twist? And there are only so many because there are only so many things that can later turn out to be what they weren't in a dramatic fashion. I mean, who cares if that ice cream you were eating later turns out to be frozen yogurt?