Booker may be on the cover of BioShock Infinite, but you could argue that Elizabeth is equally as important as a character. As such, the woman has been given her very own behind-the-scenes trailer, in which we're given insight on her creation. Irrational developers certainly love "Liz," so why shouldn't we?
"Liz" is the nickname that's been given to her by Irrational, and developers in the video note that the character just took a life of her own until her creators naturally gave her a nickname. In terms of her creation, Elizabeth can be broken down into four parts: Voice, Body, Brain, and Face.
As Infinite director Ken Levine puts it, "If we didn't get her right, the game wouldn't be right. She really is the emotional center of the game."
It's definitely worth a watch, this video, if you're looking forward to the new BioShock. If you didn't care about Elizabeth before, all that could change in the next seven minutes.
Creating Elizabeth - YouTube