C-3PO:
Built by Anakin Skywalker, C-3PO was designed as a protocol droid intended to assist in etiquette, customs, and translation, boasting that he is "fluent in over six million forms of communication".
R2-D2:
R2-D2 (Artoo-Detoo) is an astromech droid, a type of robot that usually served as a mechanic and backup computer for small spaceships. He's very brave and useful.
BB-8:
He is exactly like R2-D2, an playful astrometry droid who gets in a lot of trouble, making his round body good for running.
