Goostin is an intergalactic alien known as a googor, played by Austin.
Goostin is the partner of Gooniqua. He previously loved to cover things in goo. He, along with Gooniqua, are now singers in the Los Galacticos band with Violin Player Tyrone, Guitar Player Tasha, and Trumpet Player Pablo.
Goostin is mostly of a purple color. He wears a green and black-blue suit. His tail does not protrude from the suit, unlike his other outfits.
Austin has only played as Goostin in one episode of The Backyardigans: Los Galacticos, from season four.