Whats your favorite enemy from an RPG, not just bosses, anybody. Personally I think the Tonberries are cool, the first time I seen one of these little guys I had to chuckle a little....Then he proceeded to smackin me around a little with Everyone's Grudge. I also thought the Sith from KOTOR II were fun to battle.
Hobgoblins.
Witches on Yggdra Union. So cute when they say "You made me break a nail!" during a skirmish.
I will have to go with the Dark Adonis a.k.a Mid Boss from Disgaea.