Dr.K

Race
White Wolf

Dr. K is a scientist from before the riots that got transfurred intentionally while taking special drugs that allowed him to keep his memories at free will. He tries multiple times to stop the Human, who he believes may carry the virus, from getting outside.

Personality
He displays concern for the survival of humanity primarily, and he seems to be at least somewhat witty based on the bad ending he causes near the end of the game. However, he also appears to be very distant from the way he speaks of the human.

Appearance
He is a white wolf with red eyes, wearing a lab coat and a gas mask that presumably protects him from the toxic gasses in the facility or the virus itself.

Despite Dr.K being never seen as human during the time the player character is awake, a pile of photos can be seen. Examining them will show Dr.K's transformation. The photos can be found after Puro "defeated" him. After leaving Dr.K and entering a new room, the photos can be found in the room North from it, lower right corner. (images of Dr.K as human would be appreciated)

Background
He was first found at the Secret Door and releases sleeping gas which causes the player to fall unconscious.

Trivia
Despite his antagonistic behavior, he believes that he is just trying to do what is right. (it's implied in-game that the Human may carry the virus, and Dr. K is intent on keeping it inside the facility), meaning that he is more of an anti-hero/hero antagonist instead of a villain.
DragonSnow confirmed on Twitter that Dr. K is a wolf.