Yvonne: I adapt to everything that is revealed in each script. Those pieces of information on my character that come from the writers are like little golden nuggets! But yes, I did have to create my own past at first. The main thing that I held onto for the beginning of the series, when I didn't know all that much about where they were going to take Sarah Walker, was that she was a spy, first and foremost. But that she was capable of love, because of Bryce Larkin, her old partner and lover. There is nothing normal about being a spy, but to Sarah Walker, being a spy WAS normal. Everything else was unfamiliar territory. Including relationships and love. But I knew that she always WANTED to have love and relationships. She just had to figure out how. And here we are - season four.
Q: What is your absolute favorite moment for Sarah Walker in the series?
Yvonne: I loved when Sarah was captured by Shaw in Paris and was drugged and helpless. It was so different from the usual ass-kicking I get to do. (Which I love too). My favorite fight scene to date was the cat walk fight scene with Karolina Kurkova. Another stand-out moment was shooting the flashback scene where I wore braces and a wig, and got to be Sarah at a young age. I LOVED it!!!
Q: Where do you want to see Sarah at the end of the series, emotionally and physically?
Yvonne: I'd like to see her be more open with her emotions and able to have a normal life with Chuck. I think Sarah has always longed for a 'normal' life, but has always been too deep in the spy world. Through the seasons I think we have seen her come out of shell a little more as each episode goes by.
Q: Do you have any similarities with Sarah Walker? Any trait that's completely different?
Yvonne: I like being active! That's one similarity! And, well, the biggest difference? I don't really know how to operate all those fancy guns :)
Q: The fight scenes look so real. Have you ever connected with someone when you were fighting?
Yvonne: I once tapped someone on the nose with my foot when I was kicking them in the face. Other then that I've been pretty good!

Source: swfangirls