I recently got a Netflix account, and curiously introduced myself to Battlestar Galactica. I was instantly hooked. The character development and branching story lines are top notch.
I really got into the D'Anna Biers character (played by Lucy Lawless) . She's at times very solemn contemplating her humanity. I wanted to capture the cold machine that exists despite her discovery of human emotions.
I also liked Lt. Shaw from the "Razor" spin off. She's cool because she was such a badass. The Aussie accent helped too!