I think he's the forest god offspring or the the god themselves but without a body before. Or maybe he some kind of ayakashi/yokai that used a woman womb to have a real body. They have many fork tale about this type of plot, but we will never know. But i want to know though ╥﹏╥
Everyone have a stereotypical thought about his family name and he made it worst.
xDDDDD I thought your gonna go for the inspiration bits, but nah xD