CT, Spekkio, lv. 99
Whooped my butt everytime! although it's not really a boss, it's still tough.
Also, Seymour from ff10 when he has that stupid lance of atropy.
it's always great to beat those tuffies so you can stand there going, "OH YEAH! Who's yo' daddy now, be-yotch!?" ... or was that just me?