Death (Discworld)
Death is a fictional character in Terry Pratchett's "Discworld" series and a parody of several other personifications of death. Like most Grim Reapers, he is a black-robed skeleton usually carrying a scythe. His jurisdiction is specifically the Discworld itself; he is only a part, or minion, of Azrael, the universal Death. He has been generally used by Pratchett to explore the problems of human existence, and has become more sympathetic throughout the series.
Nac Mac Feegle
The fearlessness of Nac Mac Feegle warriors in combat is derived from their religious belief that they cannot be killed, because they are already dead; they believe that they are in the afterlife, and that any Feegle who is killed has simply been reincarnated into the world where they have already lived before. They reason that Discworld, with the sunshine, flowers, birds, trees, things to steal and people to fight, must be some sort of heaven, because "a world that good couldn't be open to just anybody". They consider it a kind of Valhalla, where brave warriors go when they are dead. So, they reason, they have already been alive somewhere else, and then died and were allowed to come to the Discworld because they have been "so" good.