Aaahhh so many great ones!! As a whole, better than the major enemies.

Seifer and the Black Waltz's (grammer?) were just cool.
VIII's Biggs and Wedge were hilarious.
Same for Ultros.
And the Turks? Funny and varied due to the fact there's more than one of them and you fight different combinations (Reno, Reno/Rude, Elena etc). Oh, and The Turks own anyway.