A Wrinkle in Time
Mrs. Whatsit -  The youngest of the three celestial beings who accompany the children on their adventure. Meg initially comes to know Mrs. Whatsit as the tramp who stole bed-sheets from their neighbors and then sought shelter from a storm in the Murrys' warm kitchen. She later learns that Mrs. Whatsit gave up her existence as a star in order to fight the Dark Thing.