M-OC was a hunter droid of the Galactic Empire, crafted by the Emperor Palpatine. The Emperor's directive to M-OC was to unearth a fabled weapon. In his pursuits, M-OC crossed paths with the Freemakers and engaged in relentless pursuit across numerous planets. Ultimately, M-OC's quest ended in failure, and he met his demise along with the Empire. R0-GR, a battle droid and seasoned veteran of the Clone Wars from the B1 series, believed M-OC brandished his twin lightsabers with a level of proficiency exceeding that of most Jedi Masters.
According to R0-GR's observations, M-OC was a skilled pilot and possessed a silver armory module affixed to his back. The armory's contents included: six extending arms, a buzz saw, blasters, flamethrowers, missile launchers, lasers, a laser net, grappling hooks, a sonic cannon, and rocket boosters. R0-GR often wondered how M-OC managed to fit all of that equipment within his armory unit.
M-OC made his debut in the second season of LEGO Star Wars: The Freemaker Adventures, an animated series broadcast on Disney XD. James Urbaniak provided the voice for M-OC. The name "M-OC" originates from "MOC", a common abbreviation in the LEGO fan community for "My Own Creation", referring to custom-built Lego models. The character M-OC was later integrated into official canon through the publication of Star Wars: Droidography.