i would have to say regenerators or U3,U3 cause he has a worm popping out of his head and he's the toughest boss and regenerators cause well the creepy noise,cuuuuuuuuuuuuuu koakukukukukukukukukukuku,you have to admit that it's a freaky noise
[color=red][/color]As the moon shines brightly,I begin my transformation.Our race will soon conquer the mortal human realm,taking down all that is in our path.What doesn't kill you...will curse you...Long live our King...Cerberous.
~Cerberous,Master of Evil
~Kingdom1234hearts,Deceiver of Hearts
~Twilight Link,The Deadly Nocturne