The Nameless One is the grim protagonist of Planescape: Torment. He is depicted as white-skinned and black haired, but the in-game descriptions give us much more information: his whole body is scarred and strange symbols and messages are tattooed all over it. Soon the player finds that he is immortal, and has lived a host of lives.
Little by little, the Nameless One's horrible past lives are unveiled, all of them adventurous, full of death and intrigue, full of ruthlessness and a mind bent on a single purpose: to find out how he came to be what he is, and also, "what makes the nature of a man?".