I liked Kuja. So far, he was the only villian I felt sorry for. He basically weighed up the odds and decided that no one deserved to live if he was dead. That's pretty darned selfish of him making him hella evil.

He was also a very literate villian. I'll always like villians that are all talk better than those that show up every 2 seconds and try to kill you but fail miserably (*cough* Seifer *cough*)

And he can fly when he's Tranced.