Nah, the Lich is/was (I think he's still alive in that snail or something) probably the creepiest thing on the show next to the guardian angel.*
The Lich's only reaction to Finn putting a sweater through his eye sockets was maniacal laughter, and then there's the fact that he has a skull with torn off skin where his lips should be, I never got how that worked.
*In my opinion
At least I'll still have the not-as-good-but-still-funny Regular Show to watch.