Kuja was a far better villain than Sephiroth. Sephiroth killed a few people here and there, and summoned meteor. Kuja destroyed kingdoms, enslaved an entire race of creatures, destroyed his home planet and almost unraveled all of existence. Kuja was the perfect villain, and Sephiroth had a cool sword.

Oh, and Seymour sucked. The actor that did his voice was such a fairy. The only FF villain I've liked less than Seymour was Seifer.