Hey, dropping in to comment since I'm the one who originally came up with our Faceless Prince. Let me see if I can't fill in the holes that Sanctaphax is missing.
As he mentioned, we're not looking for a mechanical theme for this one - more an elemental one. More like this:
Spoiler
In terms of proportions, the prince has a normal human pose (no hunchback) and is lithe and graceful. He has both hands. He's deadly not because of his strength or because of supernatural toughness but because he's literally lightning fast. Texture wise, I was looking for his metal sections to look like rough, unrefined copper:
Spoiler
For his pose, I was looking for something with some motion to it, something dynamic. Perhaps something along lines like this:
Spoiler
Zero was the original inspiration for the knee-length cable-hair. In attitude, he is menacing and malevolent. He is arrogant, self-assured, confident, and intimidating. He fights with whips made of lightning, if it matters.
Better?
EDIT: I approve of the music selection