The Masked Retriever is the secret identity of Librarian Uniqua. She makes it her job to retrieve books that have not been returned to the library. She has a horse named Toronado.
The Masked Retriever is pink with darker pink polka dots. She wears a black sombrero cordobes, a black cowl mask, a black shirt, trousers, and a black cape. She also sports a black belt around her waist with a checkmark on the buckle.
Uniqua has played the Masked Retriever in one episode of The Backyardigans: "The Masked Retriever" from season three.