Aaboukingon

Aaboukingon was a river spirit of the Ohio River, Allegheny River, or both. He took on human form for a brief period at the end of 1905 and became the paternal and spiritual source of the Matteson family line.

Biography
Nothing is known about Aaboukingon's existence before he took on human form, except that the most recent previous interaction he had with humans was with a Native American tribe that lived somewhere along his river.