I've seen them all but my choice was none of them. My heart belongs to the one character in the game who's character seemed consistent with the setting: Ashley Williams.
Some may think her a racist. That she may be, but such people never really stop and ask if, in this case, her suspicions were justified. Her Grandfather was the only human who had to surrender to an alien race, a fact that haunted her career up to Eden Prime. Her squad, the soldiers she was supposed to Shepard through battle died at the hands of another group of aliens. She sat and watched as yet another group of aliens ignored a plea for assistance, dismissed evidence of a terrible threat to all, who treated humanity with little more than contempt. Any person in such a situation who continued to implicitly trust the strangers they meet almost certainly has some sort of malfunction in their brain.
That said, if I were going to choose someone from the new game, it would be Miranda. I never did care much for Liara or Tali. In the former case, it would be cruel to both Liara and any future offspring (given that I would die centuries before Liara). In the latter all I was presented was a robot with what I assume were boobs. Worse still the various tissues in our respective bodies would be toxic to the other.
