[img_inline height="350" caption="The Boss from MGS3"]http://images2.wikia.nocookie.net/__cb20080206222439/metalgear/images/thumb/1/17/THEBOSS.jpg/250px-THEBOSS.jpg[/img_inline]
Wow, is the world revolving around me or something today? x-x (just finished a MGS3 playthrough last night after his last one 2 years ago)
But ya..while I have to agree, that the Boss is one of the most well developed and emotional driven characters in a video game ever, she really doesn't have much bearing as a decade defining character. Not many people have played Metal Gear Solid games, and even fewer then that have played MGS3 (mostly because they stopped at 2 because of the Raiden incident).
That and apparently some people have problems with the MGS story, which really isn't that hard once you think about it, its actually a pretty well strung together story, with each part having some meaning for later in the game, or later in the storyline.
But yes, back on topic, The Boss is a tragic and well defined character, but this is about iconic characters of the decade, which I think Solid Snake would probably be a better contestant for.
note: I also included a picture of her with my comment because apparently people don't know who she is T_T (seriously people, go pick up MGS3: Snake Eater....now!)