Uma Karuna Ayer is a djinn Eremite of the Marid tribe. She is first introduced when John and Philippa find her in a sleeping bag in New York City. Nimrod had mentioned that she is very resourceful may be able to help them with their problems. Uma introduces the tramp next to her as Afriel, whom after several tests reveals himself to be an angel.

She was also one of the Marid judges of John and Philippa's taranushi.

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