Only thing that I don't like is his facial expression. You hardly ever see any FORCED expression of anger, or sadness. It's normally a cool, calm, collected and sarcastically placed expression he always wears.
Which makes perfect for a plain character, in my opinion. That's why I decided to humanize him a bit by throwing in the classical "I'm-tryng-to-blow-up-a-monster-while-a-demon-is-dragging-me-down-on-a-freefall-from-a-mothereffing-skyscrapper-after-a-day-fighting-things-you-don't-wanna-know-about" expression. Blame on me.