kefka is the most friggin' annoying.
I sorta thought ultimecia was cool looking. But she can't spell worth a flip;P
I didn't get necron at all. I'll give him the glory of being my least favorite.
I remember exdeath as being an awesome villain. At least by the time you fight him and stuff. 'YOU KILLED THE PEOPLE I LOVED! AND YOU'RE A STUPID TREE! DIE!'
Vegnagun was one of the more interesting ones, I thought. And it sounds cool too.