I'm going for this, actually. Death is one of the greatest characters in Discworld, and that's saying something - Pratchett wrote how an anthropomorphic vessel for the concept of Death would behave, especially when taking into account the fact that it was shaped by the thoughts and ideas of humanity. His Death is essentially a simulacrum aware of its hyperreality.
Death isn't outside of life, it's one of its fundamental components - it's been noted by countless writers and philosophers. Not like humanity lacks a long tradition of female figures of death and fate anyway...
