Here is another picture I drew from that character a while back. I am rather happy with it.
Anyways, that character was probably the most insane and complex character I played and also probably the darkest so far. I created that character while I was reading call of cthulu and readying a campaign for some people. So the dark elements of that character certainly come from that part.
Else I played him in an RPG ( which is very unbalanced, lacking many things and maybe not written the best way ) called D20OP. That character was a specialist / doctor, with a sort of split personality into three alignments. Good, Neutral and Evil. Depending on the situation and stress level he changed rather often making it often unclear for others what was going on in his head, so I added a little visual effect.
What else to write....I am.not sure, that feels kind of like the most important things.