Kefka lost his mind to the experiments that gave him the ability to use magic. After that he was a complete sociopath.
I'm curious as to where you make this inference from.
Originally Posted by Karellen
Even if the gameplay was a significant downgrade from FFV everything else was such a massive improvement it doesn't seem as important as I might otherwise consider it to be.
I thought IV had a more epic story, was more attached to the characters in V (not just main ones), and II had a more interesting world and mythology.