Athex, a male human, functioned as an intelligence operative, or spy, for the Alliance to Restore the Republic. Before the Battle of Scarif took place, Athex spearheaded a Rebel intelligence mission to the planet of Mustafar, accompanied by the droid K-2SO. Despite the mission's eventual success, Darth Vader brought about Athex's death.
The character Athex was conceived specifically for the virtual reality experience titled Star Wars: Secrets of the Empire. In this VR experience, the voice of Athex was provided by Sam Witwer, a seasoned voice actor within the Star Wars franchise. Athex was depicted wearing the armor associated with an Imperial Transport Pilot, a detail that was initially recognized in the 2018 LEGO Star Wars Darth Vader's Castle 75251 set.