Pythia is the oracle.
When Keira first meets her she is a black 7-year-old little girl. Later on, she goes back to her original form, which is a Persian woman.
Pythia has lived a long time. She was once the infamous oracle of Delphi.
She’s the daughter of the God Janus and she is also Lucifer’s chosen one. Although she has spent most of her life trying to avoid him.
She has changed her appearance many times over the years, more so than most. She does this in hopes she wouldn’t be appealing to the devil. She was a child before, and once even a man. But it didn’t work because Lucifer knows her real form and that is who he loves.