At least those two Stormtroopers in ANH had some individual personality;
ST#1: "Do you know what's goin on?"
ST#2:"Maybe it's another drill."
ST#1:"Have you seen that new BT-16?"
ST#2:"Yeah, some of the other guys were telling me about it. They say it's quite a thing to...what was that?"
ST#1:"That's nothing. Top Gassing, don't worry about it."