Glotoneria was a wretched creature, little more than the open maw of the sea, she ravaged the coast with treacherous storms & would unleash massive tidal waves upon the villages to drag their people into the ocean to feed. There was no end to her hunger, no escape from her ferocious appetite, if anything it only grew more insatiable.
There came a long period where the beast seemed to calm, the maelstroms began to clear & the waters became tranquil, with little disturbance for many decades. Until, one night, rising from the waves beneath the full moon a tall man was seen wading through the sea towards the shore. This man shaped thing devoured the town in by sunrise.
Many legends & myths exist to explain the presence of this accursed hanyo, but no mortal man can fathom how Glotoneria mothered her half Human abomination nor what sort of hungry monster could be born from her abyssal womb.
A.aroniero is an abominate half-Yokai, born from an unknown union between Humankind & his creature mother, he has the appearance of a deceptively beautiful man with a subtle seam in his skin running along his spine. This seam will split open to unveil dark flesh underneath, his spine is an interlocked maw that opens to feed & slipping out from under this skin are long, black tendrils that drag his prey into his hungry mouth. His inherited appetite is well known across Japan, he is a cruel & vindictive abomination that uses the appeal of his fortunate appearance to lure in his victims. He has single-handedly raked a trail of carnage across the coast, if he wasn’t fulfilling himself he was tossing bodies into the churning waves to feed his mother.
Alongside being physically powerful, he is also hydrokinetic & his devouring power means he can digest any being or substance that steps into his maw in a manner of seconds.
He can breathe underwater.
As opposed to loosing power beneath the full moon, he is imbued with greater strength as the alignment of the moon creates stronger tides.
In more modern eras, he doesn’t commit cannibalism as much given that the necessity of such a thing is borderline obsolete ( in favor of wagyu ).