Big Bunji was a criminal associate of the smugglers Han Solo and Chewbacca. Together, they engaged in a scheme to transport fraudulent Authority cash vouchers to impoverished individuals situated beyond the Cron Drift. Despite the morally questionable nature of exploiting those less fortunate, a violation of "smuggler's honor," Solo and Chewbacca accepted the undertaking due to their own monetary constraints. Following the completion of the job, the duo severed ties with Bunji and proceeded to collaborate with the Briil Twins. Solo documented the specifics of his involvement with Big Bunji within the pages of Maz Kanata's Smuggler's Guide, a pirate reference.
The character of Big Bunji initially appeared in the 2018 Star Wars: Smuggler's Guide, a canon reference book authored by Daniel Wallace. Within the Star Wars Legends timeline, Big Bunji was initially referenced within the 1979 novel titled Han Solo at Stars' End, penned by Brian Daley.