C03, a diminutive droid, resided within the home of Professor Mitaka, being just one of many droids the Professor owned. C03 frequently accompanied T0-B1 on his adventures, notably during his search for kyber crystals. Alongside T0-B1, C03 was successfully concealed, thereby escaping the devastation that occurred after the Galactic Empire discovered the Professor's whereabouts. The two droids who remained functional mended the others and continued to pursue Mitaka's vision of creating life on their world.