Austin is depicted as a timid, but funny loving purple anthropomorphic kangaroo who moved into the block recently. Though generally shy during the course of season one, Austin starts to come out of his shell, revealing a smart, friendly, and imaginative child. Although rarely appearing in the spotlight, he does take the role of the lead character in some episodes.
In season one, Austin's voice was a little bit raspy, but from season two and onward, this feature disappeared. Austin's shy trait also disappears in the last two seasons, possibly caused by the show's crew trying to make it more realistic, with Austin getting to know the other children as the years pass by, similar to actual children. Also, as the series progresses, Austin takes the role of more antagonists and villains, such as Mayor Stinkypants and the Gloom Meister.
Austin is one of the Backyardigans, and also the least featured of the five main protagonists. The house he lives in is purple, to match the color of his skin. He has a toy robot named Robot Roscoe. Austin goes on adventures with his friends Uniqua, Pablo, Tyrone, and Tasha. He is smart, friendly and imaginative. He can sometimes be shy, but he is extremely helpful and he has a big heart.
Austin has appeared in many episodes of The Backyardigans. Unlike the other four main characters, he did not appear in the live-action pilot Me + My Friends or in the unaired animated pilot. His first appearance was in Pirate Treasure, the first episode of The Backyardigans. To see more, go to List of Austin's Appearances.