Wendigo
In Algonquian folklore, the wendigo () or windigo is a mythical man-eating monster or evil spirit native to the northern forests of the Atlantic Coast and Great Lakes Region of the United States and Canada. The wendigo may appear as a monster with some characteristics of a human or as a spirit who has possessed a human being and made them become monstrous. It is historically associated with murder, insatiable greed, and the cultural taboos against such behaviours.
Wendigo
The Wechuge is a similar being that appears in the legends of the Athabaskan people of the Northwest Pacific Coast. It too was cannibalistic. However, it was not so much insane as enlightened with ancestral insights.