backstory rough ideas?

Born originally as a crow yokai (why she has wings)

Overtaken by Makkuro's darkness and literally died

Gods decided she died to early and gave her another chance at life, reincarnating her as the sun goddess (true name becoming Amaterasu)

Gifted her a special divine weapon meant to protect her from death, who goes by the name Sansokuu, a crow yokai. He can take the form of a three-legged crow as well as his weapon form.