Mystery: The Thirteenth Second in the Elevator

Mad! Mad! Mad! Completely Insane! This Will Seriously Make Your Sanity Meter Drop!

I want someone who's insane! Everything they do and think should be completely illogical, enough to terrify all creation! No awkward, boring dialogue!!! No idiotic behavior! Utterly deranged, killing whoever they want! No emotions! Powerful! Their face, when you see it...