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:
List of dimensions of the Discworld
Also in "Small Gods", it has been shown that sometimes the paths of dead people can cross. This is shown at the very end of the book, when Brutha dies, he finds himself traveling with Vorbis, with whom he has already traveled across a desert. Death watches on as they walk across, seeming bemused.