SubZero

Sub-Zero is extraordinarily resistant to fear which together with his ice powers have given him the artist name Sub-Zero. He had the guts to quit his ninja clan, which marked him for death, and has even gone public about his criminal past (no Dark Secret).

Apparently he is driven only by his own motivations with no fear of any outside interference. Being a ninja he is cautious, quiet, and sure not to draw too much attention on himself. While showing the world that he's one of the good guys he, at the same time, takes care not to make himself an easy target for his clan enemies. For other individuals he appears to be a person of great bravery and self-knowledge. His stronger moral principles led to him and his corrupted brother to disown the other.

Being a former ninja he still does what he then did best; he kills his opponents having no qualms about it. That being said, he does not kill without reason. Also being hunted constantly has put his senses into a state of constant alertness but being cool about it he wouldn't appear paranoid about it.