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 MUD
Characters begin with seven lives, which can be replaced in-game. A player who dies with no lives can only be revived by a magical rite that consumes expensive components and requires the cooperation of eight high level wizards. Most PvP deaths do not reduce your life total, but otherwise have the same effects. Before 2012, a player that ran out of lives could not be revived at all.