Tsukuyomi

"God surely is kind, isn't he? He brought two people who never had a mother in the real sense... and a mother who gave birth to soulless children... together. Perhaps... there's more to that than meets the eye."

The Crow Girl is an unnamed minor yet pivotal character in the Oshi no Ko manga series. She is a seemingly supernatural being apparently aware of everything that transpires within the story.

Trivia

 * Due to her affiliation with crows and how she "guides" Ruby, a popular fan-theory is that the Crow Girl is, in fact, the Japanese deity Yatagarasu.