Death
A metaphysical being, Death serves as the dryly cynical narrator of The Book Thief. Death's duty is to carry away the souls of the recently departed, which it has apparently done for millenia. In its line of work, Death tries to focus on colors as a way of distracting itself from the survivors of those who have died. Liesel's story is one of a handful of survivors' tales that Death remembers; in fact, Death retrieves the actual written autobiography of Liesel's life after the air raid at the end of the novel. Death is "haunted" by humans and unable to reconcile humanity's capacity for evil with humanity's capacity for good.
Death is "haunted by humans."
Death says that if we're curious as to what he looks like, we only have to "find a mirror."
Death says he treats everyone the same way, "I'm nothing if not fair."
Death claims to be gentle and comforting, ".....at some point on time I will be standing over you, as genially as possible. Your soul will be in my arms. A color will be perched on my shoulder. I will carry you gently away."