...Death spirits. Sort of.
They aren't that individual. I mean, they are, but only for your death, or the death of that fly over there.
Death spirits form and act when a death occurs. So, when the slob over at Pyron's Attic swats a fly, a death spirit manifests for that death and takes what's left of the fly's spirit to whatever awaits it (which is weird enough). Then the death spirit unmanifests, goes back into the "Pool of Death," if you will, and eventually goes out for another reaping.
I like that term--very "Dead Like Me." I'll use it from now on.
So, everyone has a death spirit personalized for their...experience. Not to say all deaths are truly unique; wash your hands and then ask the dead bacteria if they feel like individuals. The "reapers" are formed for the occasion, though--feel special. You're final moment is important to us.
~Matthew