Gaki

Gaki is the ghost of a boy who starved to death.
Gaki appears as a very skinny human boy with white skin, messy medium-long black hair, black eyeballs, and red pupils.
Gaki wears a white triangular hair ornament and a yellow ginkgo leaf hair ornament, a blue cloth wrapped around his chest and shoulders and hanging down his back, exposing her stomach, blue pants, a black loincloth, and black sandals with blue thongs.
Gaki is a sad, gloomy boy who is always hungry.
Gaki is a voracious eater who never gets full and can swallow human and shikigami whole.
When a Gaki swallows a human or shikigami whole, its stomach expands to accommodate the swallow, making it unable to stand, and it sits down and strokes its stomach in satisfaction.
Gaki may vomit out any creatures it swallows that it is unable to digest, but it may also digest them completely.