Are any WoW characters actually irredeemable?

[Sanlel-scarlet-crusade]

@Hackbrew-wyrmrest-accord

And if you run out of Anima before being rehabilitated, you go to the Maw for eternal torture.

No, if you run out of anima, you cease to exist. There is no eternal “super afterlife” waiting for souls, the Shadowlands is it. Souls are anima, and once you run out, you no longer exist.