Hawkeye's a good one, too. Although, I wouldn't mind being Charles Emerson Winchester. He was snooty but he got down & dirty from time to time with hilarious consequences.
One year for Halloween I was Father Mulcahy (or however it's spelled). No reason, really. It was just what I had lying around. People on the Castro loved it. "Hey! Father Mulcahey! Woo! Here's a beer!"