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)
The Death of Rats, like Death, speaks in , but has a vocabulary consisting of words such as ' and ', the last used when it laughs, although its speech can be interpreted from context much like the Librarian's.