"Oh, I don't need to conquer the galaxy. No no, that's fine. I put all this work into my evil Sith scheme, but no! Fine! Good! Really!"
Darth Passive-Aggressive was the most annoying Sith Lord of his era. His tight psychological grip on the Senate was unraveled only when they all were forced to jointly attend a Sith intervention by Darth Open-Arms. The intervention didn't go quite so well, with many casualties among the Senate...
Darth Passive-Aggressive was a distant relative of Darth Panda.