In Mass Effect, The Commander was likely either A) Jack from LOST or B) a cute redhead from like, Paramore. We miss those days.
of course, in Mass Effect 2, you only have yourselves to blame for these things—well, yourselves and the character-creation tool. We get it, it's hilarious when PlatypuShepard is having a serious conversation about the end of the universe with The Illusive Man, but no one would really let this thing save the galaxy. Remember that whole argument about how Lincoln might not have won the election if the media had been as pervasive back then as it is now? Similarly, there never would have been a Shepard to save the galaxy, since some platypus-hating bigot would have assassinated one of these creations long before he/she ever set foot on Ilos.