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:
Flora and fauna of the Discworld
A parody of the real world sauce of the same name. The Discworld version was invented by an uncle of Mustrum Ridcully, and its ingredients include grated wahoonie, asafoetida, scumble, sulphur and saltpetre. It is a highly unstable substance and believed to be responsible (when combined with a charcoal biscuit and an after-dinner pipe) for the elder Ridcully's explosive death. (See Black powder for why the combination might be problematic.) A presumably different uncle of Ridcully's used to swear by (or rather, swear at) Wow-Wow Sauce as a hangover cure; according to Ridcully, "He seemed very peaceful when they came to lay him out". Ridcully also advised that Wow-Wow Sauce must never be consumed when sweat is condensing on the bottle (a reference to the danger posed by dynamite that has begun to sweat its nitroglycerin).