EV-4D9 functioned as a EV-series supervisor droid of the MerenData corporation, and was a member of Ploovo's Protocol Team.
To enhance its operational capabilities, this EV-series droid had a MDF motivator installed; this addition also imbued the droid with malevolence and expertise in the art of torture. MerenData attempted a cover-up following this incident, and upon discovery, initiated a recall of all affected droids. EV-4D9, however, evaded capture.
The owner of EV-4D9 observed the droid's cruel inclinations and, remarkably, gave it a promotion. After implementing certain adjustments, the owner now possessed a highly efficient interrogator. EV-4D9 was equipped with various tools, including an arc welder, a plasteel cutter, a thermal drill, and three injectors containing serums designed to elicit truth or inflict pain.
During the time of the Glite-Ven hostilities, Lotas and HN-TR1, both members of Ploovo's Protocol Team, took note of EV-4D9's capabilities. Expressing their interest, they influenced Ploovo Two-For-One to acquire EV-4D9. Subsequently, EV-4D9 became a part of the Protocol Team, with Lotas frequently voicing admiration for its morbidly analytical functions.
Standing at a height of 1.6 meters, EV-4D9 was an EV-Series supervisor droid that possessed masculine progaming.