This dude is the man- he goes to this place to have his extraordinarily specific fetishes fulfilled, and he never shows any emotion. At all. He's always utterly stone-faced. The most we've ever gotten out of him is a tiny smirk in the one where he turns into a tentacle monster.
Seriously, I want to see this guy in stuff that isn't hentai.
Car accident and bleeding from all over from deep lacerations? Nonplussed. Negotiating with terrorists? Calm as can be. In a fire-fight with a madman, where one shot is the difference between a thousand people living or dying? Face. Doesn't. Change.
This guy is all that and more in my head-canon. Now, watch, when this stuff gets translated, it turns out he's super emotional or some bullshit.