"They want a new, sort of cool lead for The CW," Thomas admitted. "So they are asking me to write it in the tone that I normally write. It will not be 'Zombie Apocalypse Show;' it will be fun, cool, smart, funny single-female lead who happens to be a zombie. She has to eat brains in order to survive....We're not sticking that close to the comics; the thing we're taking from the comic is this mid-20s female zombie who eats brains and gets the memories of the dead...but we put her in a coroner's office so there's a case-of-the-week where she gets snippets of memories of the deceased and tries to solve the crime."
In the comics, Liv is called Gwen, and she's not a med student but a gravedigger. In that series, her friends are fantastical creatures rather than (presumably) attractive, CW-friendly people.