King Austin is a monarch who lives in a large castle on the right side of the Swamp of Stinkiness. He is often seen sitting on his throne. King Austin stays in close contact with his friend Queen Tasha. When he was visited by Uniqua the Pink, the Guardian of the Gate, and the Moose of the Mist, he dubbed all three of them knights.
King Austin is primarily purple. He wears a purple-and-white robe, his standard blue pants, and a purple crown.
Austin has played King Austin in one episode of The Backyardigans: "Knights Are Brave and Strong" from season one.