Doctor was a robot who highly resembled a short human with blond hair and dark skin. He wore a white lab coat, a pink scarf and sliver goggles with red lens.
Doctor was an intelligent and inquizative Robot who was kind enough to provide a community to robots who had accepted death. Even so he was quite depressed and had accepted the fate of death himself as it awaited everyone.
Doctor was the leader of a community of Robots who accepted the ideals of dieing by the Ruin. When a mysterious man arrived, he talked to him about his body and how he didn't belong in a place where Robots litterally come to die. Doctor reveals his suspiciouns of this man being the immortal Casshern after the man kills a bandit who was looking for Casshern. The man reveals himself to be Casshern and the community is turned into life craving, mindless robots as they search hopelessly for a way out of death, against all their ideals. Casshern slays each and every one of these robots and even though Doctor was not involved he was blindly caught in the crossfire and slain by Casshern.