Let me express my appreciation for Kefka. He was a great departure from the ussual 'ME AM EVIL' reptilian bosses or the cookie cutter Darth Vader wannabes in cruel looking armor.
Probably because I liked the Batman movie so much as a kid, I really liked FF6 as well. Kefka is like the Joker. He's a psychopath and the comic relief of the story.
I think he's tragic too, in his own way....although it's hard to feel sorry for him. He was an experimental magitek knight, and the flawed procedures resulted in him becoming psychotic (why they still let him be in charge of stuff I don't know).