As you already know there is no possible way to get the creature voice or skeleton face, I know what your thinking "EPIC PHAIL NAMCO!" but no, in fact the creature voice and skeleton face couldn't input , dang.
Wouldn't that be sweet if we can use the "Creature" voice or skeleton face? BUT... the only way you can use the skeleton face and creature voice is through the Soul Calibur 4 Offline Edit.
Here are some epic Skeletons with the creature voice.
NOTE: Soul Calibur 4 Offline Edit is used in this video.