Over at the Thinking With Portal website there is a test to see which Portal character you would be. The only two results I know of are Ratman and Chell. It's a pretty entertaining survey, what were your results?
This is what I got:
You're the quiet, artistic type, happy to ponder the solution to a puzzle in quiet solitude. Compatible cooperative test partners include introspective loners, deaf-mute invisible people, and mannequins.
I got P-body B]