It's a relatively simple answer, and accurate as far as it goes.
I'm a diplomat and a leader. I like to think that I'm a good friend, and a trustworthy ally. I'm the person that my choices made me, and I believe that, with the usual exceptions, those choices were the right ones. Or at least the best ones I could make. That the right thing and the best thing aren't always the same wasn't a lesson I relished learning.
I'm a different person, in some ways, to who I was just three years ago. For this I can alternately thank and blame the variety of people in Atlantis who work with and under me; Teyla gets thanked and John and Rodney get blamed.
There's really only so much you can say about yourself without getting ridiculous or too autobiographical; I'm not quite ready to pen my memoirs. So:
My name is Elizabeth Weir, and I am exactly who I want to be -- with room for improvement.
[I have not seen all of season three as yet, and will not yet (if ever) be writing Elizabeth totally up to speed with canon as it stands. However, I cut the post Just In Case. If there are any problems, please let me know!]