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Chopper"s master, Hera Syndulla was a member of a resistance movement opposing the Empire. By five years prior to the Battle of Yavin, most of his original components had been replaced by second hand parts.
Chopper made himself an invaluable member of the Ghost by customizing the vessel to such a degree that he is the only one who understands its systems well enough to keep it running. Despite his mechanical skills, he preferred to do things such as playing holochess rather than performing menial labor aboard the ship. His favorite feature was his electroshock prod, which he used to shock enemies.
Chopper spoke binary, a common droid language. He could only be understood by Hera, Kanan Jarrus, and Sabine Wren. He and Ezra Bridger enjoy playing tricks on one another. He also later grew fond of C-3PO, after the latter complimented him for his polite "manners." [Source: wikia]
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