I can't do that.
The thing about Sephiroth is that he isn't evil, or sinister in the least bit. He's almost content with anti-hero status; he believes he's bringing divine justice to the planet. He has a goal, and death at the hands of Sephiroth only happens under the circumstance that someone gets in the way of that goal.
Now Kefka, there's an insidious guy. There's no rhyme or reason for the things he does other than he feels like doing these things. "Hmm... poisoning the drinking supply of an entire community sounds fun."
"Sure, I'll try try to destroy the world just as every FF villain before and following me has attempted. What's my reason? Bah, don't need one! And I'll actually succeed to an extent!"
