Tojnun was an artist. He belonged to the group known as the Pre-Exile Masters, and his work had an impact on the Mandalorian warrior Sabine Wren as she cultivated her individual artistic approach. During the Mission to Mandalore which took place in 1 BBY, Sabine played a role in freeing her father, Alrich Wren, from his imprisonment by the Imperial forces. Upon their reunion, Alrich observed that his daughter's designs were characteristic of the Pre-Exile Masters; Sabine acknowledged Tojnun's influence, but also emphasized that her style was uniquely her own.
The character of Tojnun was referenced in the initial segment of Star Wars Rebels: Heroes of Mandalore. This two-part episode served as the debut for the fourth season of Star Wars Rebels, the animated TV show, and it was broadcast on October 16, 2017.