The Hanged Man- Heero Yuy
I've only seen about 2 episodes of Gundam Wing, but I've read enough about Heero on the internet to know that he's a very angst-ridden young man. Seeing as how this card symbolizes letting go, reversal, suspension, and sacrifice, I thought he was a good choice. He is certainly willing to give his life for a higher cause (maybe a little TOO willing), while at the same time learning to accept life as a beautiful thing.