FFT had a lot of great villains. Chapter one had Algus, an absolute pig of a child. Chapter two has Gafgarion, total bad ass mercenary. Chapter three has Wiegraf, nice guy turned monster by evil rocks.
The last chapter is loaded, with Dicedarg (sp?), Marquis Elmdor, Vormav, Delita. You can really enjoy hating these people, it's great.