Amanozako

Amanozako is a goddess of rebellion mentioned in the Wakan Sansai Zue, who is born when Susano-o lets his own ferocious spirit (Ara Mitama) build up inside him until he vomits her out. It is said that she is the ancestor deity of all yokai who share her short-fused temper and disobedience. Amanozako is a curious demon looking for "someone" and volunteers to stick with the protagonist who has recently acquired the power of Nahobino and is wandering over Da'at cluelessly. She was created by the Tengu, who wanted a Great Tengu to lead them through the end of the world; like Aogami, she was born when a Proto-Fiend was imbued with Magatsuhi. When she first came into being, her power went wild and she fled, eventually wishing to reunite with her father, Susano-o and rejected the tengu, who spent a significant amount of time looking for her.