Well I can't think of anyone else in FFX that may classify as the main antagonist. Seymour doesn't count because he's a scrub by the end of his arc, the Yevon dude is a dude we basically don't know the entire game. I think Jecht is the best candidate as the main villain of the game, and he was cool.I don't remember if Jecht was a villain or not, but I did like his design, though I find Auron's to be cooler IMO. I'm not a fan of Kuja's by any means, I just don't like how he's prettier than the female members of the game. I like eye candy, but I shouldn't have a difficult time trying to figure gender unless it's intentional.