Kain is one of my favorite RPG characters overall. Unfortunately, we were given little chance to delve deep into his strange psyche, but what we did see fleshed out a character plagued by complexities: uncertainty, jealousy, loyalty, and self-doubt... I suppose that this is part of why I find him fascinating.
The pose shown here is how I have always pictured him, brooding, thinking much and saying little; perhaps reflecting on his past, or his present afflictions, or the cleansing future that awaits him.
Kain's facial features were derived from a model, but that helmet (that helmet!) was entirely spawned from my imagination... It took me the better part of a day's work to get it just so, but even I make mistakes... ;-)