Kefka is the best villain in the series. This is not because he is the most powerful, more demented, or most threatening. If anything, it's the opposite. Kefka starts out as a joke, capable of little more than empty threats and silly one-liners. When first fought, he about as powerful than a party member from the early game. But over the course of FF6's first half, he works his way up in the world, committing increasingly heinous acts and gaining a stronger position to work from. Yet despite this, he never seems to notice a difference, reciting silly jokes while killing the innocent. That's creepy. And by the end, we learn why he still jokes; the death of countless innocents was the best possible thing in his eyes. Sort of like the nihilism of FFX's Seymour, but with excessive malice instead of despair. Kefka represents one of the most threatening types of villains: the enemy of all things that only grows more powerful.