There are only two characters (three if you count Obi-Wan's ghost) who appear in every film of the Saga. But one of these doesn't get enough credit. That's why I'm starting this thread to recognize the heroism and greatness of the true hero of the Saga: C-3PO!
If not for Threepio, the heroes of the Rebellion would have been crushed by the trash compactor. Echo Base would have been overrun by Snowtroopers. Anakin and Padme would not have had a legal witness to sign their marriage certificate. The Ewoks wouldn't have been able to spring their ambush, since the Imperials wouldn't run into the forest to chase teddy bears.
No one would know what R2-D2 was saying. An entire clan of Jawas would not have had decent last rites. Owen Lars would never have purchased R2-D2, and Tank or Fixer would have ended up with the holo from Leia.
Jabba the Hutt wouldn't have been able to make himself understood. Kit Fisto would have no reason to smile. CG would not have been explored to its fullest extent in the droid factory. There would have been no circuits or gears to donate to R2-D2 after the Battle of Yavin.
The Princess would have developed an ulcer worrying about Han and Luke on Hoth. And she would have lost her virtue aboard the Falcon during the escape in the asteroid field, possibly taking up more time than was necessary and resulting in TIEs locating the Rebels.
The Lars family homestead would have fallen into disrepair following Shmi's abduction, because it's obvious Owen won't do any work. R2-D2 would not have been able to lock the door in Mos Eisley and would have been found by Stormtroopers.
And, most importantly, Padme's hord'ouvres would have been cold!!
Sing the praises of anyone you want. Me, I choose to recognize the true hero of the galaxy, and the greatest character in the Star Wars series. (Well, after Teek.)