#4R2-D2
185 Points, 13 of 15 Lists, Top vote: #1 MartyS (Gromit)
Program Astromech
R2-D2 is an astromech droid who appears in the Star Wars franchise. Let's skip over the prequels again, and start with the good movies. A droid for the rebellion, he was granted a secret message for an important figure in the rebellion, Princess Leia Organa, to Obi Wan Kenobi. He eventually was found by farmer Luke Skywalker who took him to Obi Wan. R2-D2 then joined Luke, Obi Wan, his friend C-3PO, smuggler Han Solo and his partner Chewbacca on a mission to the Death Star. Since then, R2-D2 has proven himself a powerful ally of the rebellion, often assisting Luke as a pilot and using his abilities to save his friends.
R2-D2 is often partnered with the droid C-3PO and often acts much more impulsively than his friend. He is also more brave and clever, often showing up C-3PO's naysaying with his own abilities and despite the fact that he is not built for combat, his ingenuity has served him well in protecting his friends. R2 contains a number of tools including rocket booster, holoprojector/recorder, periscope, fire extinguisher, hidden lightsaber compartment with ejector, small saw, electro-shock prod (electric shock), data probe, utility arm, and a life-form scanner.
Trivia George Lucas came up with the name R2-D2 during post-production of American Graffiti (1973). One of the sound crew wanted Lucas to retrieve Reel #2 of the Second Dialogue track. In post-production parlance, this came out as, "Could you get R2-D2 for me?" Lucas liked the sound of that and noted it down for future use.