Zoey

Zoey is one of the Survivors, the teenage daughter of a wealthy family. Zoey's face is modeled from Alésia Glidewell, the person from which Chell from Valve's Portal was modeled. In official media, she is usually seen holding the hunting rifle, and dual pistols.

Official description
After spending her first semester holed up in a dorm room watching old horror movies, Zoey was given a choice: Stop fooling around and get her grades up, or drop out. Now that the planet's overrun with murderous zombies, and all of her professors are dead, Zoey at least has the cold comfort that she's been studying up on the right subject after all.