The founder of Foster's. Madame Foster is elderly but has child-like boundless energy, and enjoys life to the fullest. Her imaginary friend is Mr. Herriman, whom she imagined when she was a child and never gave up. Like Bloo, Madame Foster occasionally becomes hyperactive and mischievous. However, there are times she's shown to be the wisdom of the house. She is voiced by Candi Milo.