Amanojaku

A misconception lies in that Amanojaku are demons or oni. Though they could fit the bill of being a sort of demon, they're actually just another manner of youkai. They're often known as contrary or perverse, often acting out against beliefs rather than with them.

As far as natural abilities go, Amanojaku are commonly capable of seeing into a person's heart, from which they try to change how that person feels and make it the opposite. The stronger are capable of doing this via magical means, others must use sly words and trickery. In the case of Seija Kijin, her power to change another person's heart had actually, perhaps by manner of some defect, changed into the ability to simply overturn things, physical or, later on, perhaps conceptual.

Another ability common among the more monstrous amanojaku is the ability to take the form of a person via wearing their skin. Though some Amanokjaku are capable of controlling themselves while doing this, the less physical of the youkai can sometimes become infused with their victims, becoming a physical form entirely separate of either party.