Force users that were sworn to the darkside
For a force user its typically a matter of choice and usage of dark emotions/desire for knowledge that tempts them to the darkside. But in your reading of the EU, have you ever encountered a user who much like the Antichrist in the Bible- seemed to have been devised and or predestined to become a darkside user? Did they exist as a force user solely to cause destruction and to further chaos? What force user comes the closest to having seem predestined by fate to become a darksider rather than falling to it?