BB was surely more like a "little brother" of R2D2? Just like... A smaller and more mobile version... Haha.
Don't lynch me purists but I found the most annoying character in this one to be ol' Chewie...
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I also felt like Ford phoned in his performance, which I've gathered from interviews as well and his general feelings on it, but strangely it works quite well anyway because Han Solo is supposed to seem like he's sort of given up a bit? So his "weariness" plays quite well.