Question regarding psychopomps

I've got an idea that involves various psychopomps and/or protectors of the dead in British folkore but have hit a bit of a snag, namely that none of the sources I've looked at actually mention what the dead are being protected from and I'm having a bit of trouble coming up with a suitable menace (or variety of manaces) that a) is sufficiently interesting, and b) doesn't make it seem like I'm ripping off Bleach. Any ideas?

Also, what would be a good title for a psychopomp? I don't want to use 'reaper' since a) it's kind of cliche, b) not entirely accurate, and c) I thought it might be interesting/funny if the psychopomps in question found the whole 'grim reaper' thing vaguely insulting. I was toying with using 'Ankou' but that might be a bit too heavily associated with Brittany (although the Ankou also feature in Cornish. Welsh, and even Irish folklore under slightly diffent names, eg. Ancow in Cornwall, Angau in Wales, etc)

You could go norse mythology and use Valkyries. Threats could be any kind of monster.

The first thing that came to mind are grave robbers- if the body is connected to the dead spirits, that is. Perhaps demons or some kind of monster that wants to kidnap wayward spirits?

The threat might also be something less direct: without a psychopomp to lead the dead to the afterlife, dead souls might wander the world; there are a few potential problems that this could result in, whether interfering with the living, danger to the working of the world, simple boredom (there's little to do in the half-place between one world and the next), or more existential dangers such as gradual loss of humanity or awareness.

Necromancers who bind the souls of the living to this plane, perhaps? Demons who feed on or trap dead souls?

Okay, I've decided to go with the indirect approach that Ars suggested (among other things spending too long in the living world without being part of it can send ghosts a little loopy), with the possibility of something more direct being held in reserve for potential future plot arcs. Thanks for all your help.

On a related note, I still need to come up with an umbrella term for a psychopomp. 'Psychopomp' sounds too technical somehow (not to mention too Greek) and as I said above I really, really don't want to use 'reaper'. Current in the lead are 'guide' (which might be a little bland) and some varient of 'Ankou' (which has cool points but is iffy for linguistic reasons). Attempts to coin something new by figuring out what 'guide/conductor of souls' would be in Old English and working from there have thus far been an exercise in frustration. Thoughts?

Try 'Mortis Heri' (Death Master). Latin is always cool.