Kalwar was a youthful cadet from the Quermian species. During the High Republic Era, he worked as a navigator on the Byne Guild's Legacy Run, a Class A modular freight transport. In the year 232 BBY, Kalwar identified an approaching celestial body that threatened a collision with the Legacy Run, and he subsequently alerted Captain Hedda Casset to the impending danger. Just prior to their demise in the crash, Casset experienced a sense of admiration for Kalwar's composed and controlled behavior, even in the face of such dire circumstances. Kalwar possessed gray skin, brown eyes, and donned clothing featuring a black collar.
The initial appearance of Kalwar occurred in Light of the Jedi, a book authored by Charles Soule. This novel was released in 2021 as a component of Phase I of the Star Wars: The High Republic multi-platform initiative.