Tendou Setsuna

A sort of robot, android, or cyborg, if you will - in other words, a being far removed from humanity who, upon being summoned to the land of Tokyo Babel by Lilith, was given orders to help pave the way towards Heaven.

In addition to extraordinary combat prowess and reflexes, rivaling even that of angels and demons, the nanomachines circulating in his bloodstream lend him rapid regenerative abilities. ...He is an apocryphal monster who, though a man in nature, was forced to renounce his humanity.

Rather than labeling his emotional landscape as scarce, it would be more fitting to say that his rusted heart is merely in need of a bit of oiling - after all, he had never once had to rely on feelings since his birth.