Death (Discworld)
Death has appeared in every Discworld novel, with the exception of "The Wee Free Men" and "Snuff", and had a possible cameo at the end of "Johnny and the Dead" (the character was not identified, but spoke in unquoted small caps). The Discworld books with Death as a leading character, starting with "Mort" in 1987, are:
Death (Discworld)
He was one of a disparate multitude of death-personifications created during Death's absence in "Reaper Man". The Death of Rats refused to be reabsorbed into Death himself upon the latter's resumption of his duties; therefore Death kept him around for company. The Death of Fleas also escaped resorption, but has not been seen since "Reaper Man". The Death of Rats resembles a rodentine skeleton walking on its hind legs, wearing a black robe, and carrying a tiny scythe, his form having taken shape from the latent form of Death himself in "Reaper Man", as he came into existence in the vicinity of Bill Door.