Anastacia of Astora
Anastacia is a firekeeper, one who tends and is bound to their particular bonfire (which are the games form of ingenius checkpoint) and can only be female. The bonfires work brilliantly in context, both being a timless place of safety and clever continuation of the fire theme that runs throughout the game.
Anastacia cannot speak due to her tongue being cut out for being "impure". There isn't any real explanation as to why, but the crestfallen warrior who sits near her bonfire suggests it's so "she can't say any god's name in vain".