From what he’s said, Anthony Daniels’ voice for C-3PO came because he thought he should be prissy, tense, and flustered. I’ve heard him do voice work for other characters that’s much different from Threepio, so it was a deliberate choice, and worked brilliantly to create a memorable character that’s a perfect foil for R2. The old joke of him being the token gay character in Star Wars goes waaaay back; I shouldn’t have rehashed it.
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