First human Spectre, spent some time tracking down a traitor only to find out that there's a whole fleet of sentient AI ready to obliterate all the organic life in the galaxy. Died, brought back to life, and pissed off as hell about the fact that nobody in this galaxy can seem to take their head out of their ass long enough to realize we're all going to die if we don't work together.

[That about sums it up, right?]

Name's Shepard.