Little Rock is said to be 12 as of Zombieland, quoted by Wichita after Tallahassee questioned her about famous people, which she knew nothing about. She has dark hair, and is fond of hats. Her choice in clothes appears to be in favor of shirts with stripes with a jacket of some kind for colder weather.
A cunning twelve year old, she is proficient with firearms (claiming to have attained this due to playing "[All those] violent video games"), and often caught Columbus and even Tallahassee unaware on several occasions. Despite her fortitude for survival, Little Rock's youth was still apparent in a number of instances throughout the original film, as evidenced by her obliviousness as to who certain political and religious figures are, e.g. Bill Murray and Gandhi, along with her enthusiasm towards visiting Pacific Playland. After meeting Columbus and Tallahassee, she started growing more respectful of others such, as when Columbus shot Bill Murray she asked the actor if he had "any Regrets?".
Little Rock has a very close bond with her older sister Wichita, assisting her in pulling off numerous cons before and after the Zombie Apocalypse. Over the course of the original film, Little Rock developed a sort of father-daughter relationship with Tallahassee, especially during their time in Bill Murray's Mansion when he gave her tips on how to work on her aim, and they even built a fort together. She also came to acquire some degree of respect for Columbus after he saved her and Wichita from a horde of zombies during the film's climax.