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:
Discworld gods
Azrael clearly has a personality and a concept of mercy like his servant, the Death of the Discworld. He appears in an integral role (although not particularly often) in "Reaper Man" and overrules the Auditors' wishes, allowing the Discworld Death to carry out his own merciful bending of the rules for a personal case when he agrees to Death's demand