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 characters
After the events of "Mort", Mort leaves Death's service and marries Ysabell. The couple are given the title of Duke and Duchess of Sto Helit, and later also become the parents of Susan Sto Helit. They subsequently meet their end after a freak accident sends their carriage plunging into a ravine, as revealed in "Soul Music". They had discussed this with Death and had turned down his offer to extend the duration of their existence on the grounds that it wouldn't be the same as actually lengthening their lives.