This talk about Kefka, not talking it down but the thing that made Kefka interesting compared to most villain was that he was a clown... though it was hard to tell back when FFVI was in pixel form, but the Kefka we know now is more of Square's answer to Batman's Joker.

The villains we have now take themselves far too seriously, but I get what you mean by "The Kefka" in the sense one of them might do something to the warring triad and cause total chaos.

Only villain that seemed to come close with that clowning personality was Nael in 1.0... and I wished I didn't miss out on that. His flamboyantly playful nature and posing while boasting about his grand scheme. There is Regula that's a little out there, but we don't get to see much of him yet... hopefully his story gets fleshed out more.