The Mystery Lifeguard is the guardian of Tiki Beach. His job is to ensure that only the most experienced surfers are allowed to surf the waves of Tiki Beach. He knows a surfing trick called the Tiki Wacky.
The Mystery Lifeguard is primarily purple. He wears teal swim shorts and a white T-shirt with a blue medical cross on the front. He occasionally sports a white hat.
Austin has played the Mystery Lifeguard in one episode of The Backyardigans: "Surf's Up" from season one.