Proudfoot is the fluffy white kitten who arrives with Millie when, as the Goddess, she arrives at Chrestomanci Castle as a refugee.  Proudfoot is one of the kittens of Bethi, the cat whose death the Goddess had taken as a portent of what happens to Incarnate Goddesses when they age out of their job.

The Goddess hides with Christopher Chant's help until the crisis of Gabriel de Witt's disappearance requires all hands on deck.  And during that crisis, Proudfoot first opens her eyes, which ends up charming everyone who comes in contact with her.