You want strange? here we are. this turned up while I was going through the skins for SoC, and I'm about as sure as to what it is as I am the psuedogiant, human, but not much past that.
taken from the skin, it's name is "karlik". I don't speak much russian at all, so I don't know what it means.
it's halfsized to fit on the forum, but the fulll, original can be found here
http://stalker.wikia.com/wiki/File:Act_karlik_s.png