Baba (The Scarlet Empress)
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The character is mentioned only once, as "Baba"; the name "Yaga" does not appear at any point in the novel, and there's no clear indication that the Gallifreyan Baba is meant to be the Slavic folkloric figure.
Talk about it here.
Baba Yaga was an aunt of Iris Wildthyme. She was Iris' favourite aunt.
She had a shawl made from the feathers of every bird her people knew, with which she could travel anywhere in the world. (PROSE: The Scarlet Empress)