Okey, so, is this some sort of visual representation of... dunno... anything? What is this supposed to be, I'm really curious.

Exorcism.

The power of my fundoshi compels you!

The power of my fundoshi compels you!!

You'd think that by the time a face materializes on the back of her head she'd be beyond exorcism. But you can never deny the power of an old, bald monk in his old-timey underwear.

nah thats a youkai female, a demon girl with a mouth behind her head, read somewhere the hair could be used as hands too o.O

Brett said:
You'd think that by the time a face materializes on the back of her head she'd be beyond exorcism. But you can never deny the power of an old, bald monk in his old-timey underwear.

True, very true

Aren't those the Aliens from that Gantz mission?
The one where the mouthhead chick was getting raped and that bald guy was the last boss of the mission(the shapeshifter).

The lady monster here is called Futakuchi-onna ('two-mouthed woman'), just for some pieces of additional info.