Fan Casting

Foster's Home for Imaginary Friends is set in a universe in which childhood imaginary friends take physical form and become real as soon as children imagine them. Once children outgrow them, friends are relocated to the titular orphanage, where they stay until other children adopt them. The home is run by the elderly Madame Foster, its lovable, kind founder; her rabbit imaginary friend Mr. Herriman, the strict rule-abider and business manager; and her granddaughter Frankie, who handles day-to-day operations.