Don Austin is somewhat ignorant, proven when he refuses to return the book The Case of the Climbing Cat. The Masked Retriever eventually discovers that he never finished reading it, and allows him to renew the book.
Don Austin is mostly a purple color. He has a gray mustache, and wears a green suit with a gold pattern, a golden vest, and a white undershirt with a bright purple scarf tied around his neck.
Austin has played Don Austin in one episode of The Backyardigans: "The Masked Retriever," from season three.