I'd have to say caterchipillars (as per the Spoony One), buels and geezards. Man, geezards are pretty cool looking, but are among the wimpiest enemies in the game. And they drop screws! HOW?!?!?

For some reason, I didn't mind elastoids as much. Though they are weird. And are they actually a monster? A robot? Some kind of weird esthar bio-weaponry?

Though I do like elvoret and elnoyles. They're pretty bad-ass looking, so what's wrong with them? Its a frickin' demon! Its supposed to be scary! Giant hornet - scary. Jay Leno's chin - SCARY.