I'm surprised Kuja isn't winning. IX had my favorite ending, and Kuja was a large part of what made it so awesome. I will give a little credit to Ultimecia, though. Not because of anything she did, I just thought it was kind of awesome that the party pwned her without even letting her finish her cliche villain speech (Although I kept reloading and trying to hold out without killing her for as long as I could so I could see "the rest" of her speech. Finally decided screw it, looked it up online, and found out that actually was as far as she gets no matter what -.- ).