He is the Guardian spirit at the north end of creation, which happens to be in the Arctic. He is invisible and you only ever see the smoke from his cooking in the form of the Northern Lights, rainbows, the Milky Way — or pie in the sky.
He’s a bit of a cannibal, and very strange things happen in his stomach. During the Hamatsa Secret Society Dance (hosted by MC KWAKWAKALANOOKSIWAE), followers are swallowed in one of his many mouths, digested and then lose their identities somewhere between his belly and his major intestine.
Once purified in this way, converts are filled with his spirit before presumably being regurgitated or otherwise restored to life in a manner we are keen to avoid discovering more about.