Programmed for etiquette and protocol, “Threepio” was built by a young Anakin Skywalker, and has been a constant companion to astromech droid R2-D2′. In Attack of the Clones, C-3PO left with Anakin and R2-D2 for Geonosis, where he had a bit of a misadventure — accidentally swapping heads with a battle droid. C-3PO found he was “quite beside himself” literally on the wrong side of the first battle of the Clone Wars.