Insatiable hunger

Wendigo

This possession transforms the victim both physically and mentally, turning them into a monstrous creature consumed by an eternal, gnawing hunger that can never be satisfied.

Bulgasari

In some tellings its appearance is described as bear-like or otherwise monstrous, with an insatiable, growing hunger that focuses specifically on metal rather than food in general.

Tlatecuhtli

Tlatecuhtli is the earth given the shape of a devouring monster in Aztec tradition: a primeval creature found swimming in the waters that covered the world before its ordering, with mouths at the joints of its body — elbows and knees — in addition to its main mouth, so that it bites and consumes from more than one place at once.