Mrs. Sprat is a nurse at the Knights of Malta Hospital. She often nags at Bigby Wolf for smoking in the hospital. Her first name is Leigh.
Mrs. Sprat is unattractive and fat, and is spiteful toward the many good-looking people in her community. She teams up with Mister Dark and promises to reveal the location of the other Fables if he will make her beautiful, make the beautiful people ugly, and for a prince to love her with true love.
When Mrs. Sprat becomes impatient with exercise and diet, she asks Mister Dark to make her beautiful as fast as possible even if it is painful. He makes her beautiful and intends to make her his queen before North Wind kills him.