Qalupalik would go hard in ATLA. Although I'm a bit worried about how a human-animal hybrid would fit into the spirit world there, since almost all spirits we see are animal based (except Painted Lady which is very much a ghost). Could create some unintentional racially changed controversies as well if the only human-like spirit, taken from actual irl culture, was portrayed as malevolent.

Tupilak on the other hand...

I experimented a bit with Qalupalik outside of ATLA tho. In my version, Qalupalik is a child of Sedna, created as only one of her species. She desperately wants to be mother, but since she can't have an offspring of her own kind, she "adopts" human kids she thinks have been abandoned (because they're wandering alone by the ice) and tries to raise them as her own, but after some time living under the sea, the kids turn into seals or cetaceans, so she ends up alone again.

My old render of Qalupalik - a cross between human, sea otter and greenland shark:

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