They are...grotesque. Large, with twisting limbs and features that resembles the tentacles found on sea life, yet they remain bipedal. I do not believe them to be demons, yet they possess a demonic appearance. I do not know what exactly they are, but they are wearing hospital gowns.

[Not human, in other words. And with the mention of hospital gowns, Miyako gives her own a discreet adjustment to ensure that no unfortunate mishaps will be happening with the gown.]