R-3DO, a protocol droid, served the Resistance, stationed at their Resistance base located on D'Qar. This crimson-hued droid was responsible for keeping watch over the Resistance's network of espionage droids. R-3DO stood among a group of Resistance personnel as they observed the Millennium Falcon piloted by Rey as it departed on a mission to locate Luke Skywalker.
Star Wars: Episode VII The Force Awakens marked the initial appearance of R-3DO, initially as an uncredited extra. The droid received its designation upon its debut as an action figure within the Disney Parks' Droid Factory toy series, offered exclusively at Star Wars Celebration Orlando during the year 2017.