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Chewbacca is not Luke's sidekick, so one has to (potentially) consider every other character in Star Wars. Your definition part needs to point a bit more towards the answer. Look at some of the other clues and you should get the idea.
Well he is the most obvious Luke, however the reason I got the answer was purely because of the theme for "sidekicks". Chewbacca was the first sidekick I thought of in Star Wars, and it fit with "Eat".