Ku'Baku existed as a star, specifically a blue giant. It acted as the central star within the Ku'Bakai system, which was located within the Outer Rim Territories, and the planet known as Kubindi revolved around it in an orbit.
Initially, the name Ku'Bakai was used for Ku'Baku within the Star Wars Legends expanded universe. The canon continuity incorporated Ku'Baku in the 2015 publication Star Wars: Build the Millennium Falcon 34; however, the spelling was altered from Ku'Bakai to Ku'Baku by replacing the "ai" with a "u".