Skeletor- because he has a skull for a head.
Cervantes from Soul Calibur is the coolest zombie pirate if you were to ask me.
Kenpachi- Bleach's most deadly Death god.
Pein from Naruto not only can take life away but he can also ressurect himself.
Time for you Mr. Osborn!
Many thanks Geordie Green Lantern. Today I approve of: death.