Via Starwars.com:

THIS LITTLE DROID AND THE GHOST CREW HAVE BEEN THROUGH A LOT TOGETHER.

No droid is quite like C1-10P. The Ghost‘s resident astromech positively oozes attitude and bravado and more than a fair amount of sass. Chopper’s warbles and shouts have showcased his distinct personality since the beginning of Star Wars Rebels, while his arms have added clear punctuation to all his statements. For a droid without obvious facial expressions, Chopper has absolutely no poker face. You never have to wonder what he’s thinking or plotting.

Even when he’s disgruntled — which is almost all the time — Chop is a crucial part of the ship’s crew. His programming, jetpack, and instruments have been key to bailing the crew out of jams. When Chopper’s not saving the day or rolling his eyes at his teammates, he shows heart and loyalty. These are six times he’s proven his mettle (or metal).

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