Ellie Williams is the 14-year-old girl Joel is hired to smuggle out of Boston, and your companion for most of The Last of Us Part I. She was bitten weeks earlier and never turned, so the Fireflies believe her immunity could lead to a vaccine. You play as her in the winter chapter and in the Left Behind DLC.
Ellie is quick-tongued, curious and tougher than she looks. Everything outside the quarantine wall is new to her, so she asks Joel endless questions about life before the outbreak, from ice cream trucks to movie posters. She swears freely, teases Bill about his weight and flips him off in his own armory, but she also carries real guilt about the people who get hurt helping her.
When Ellie follows Joel she stays out of sight during stealth and enemies cannot spot her, so she never gives away your position. She shouts warnings about where enemies are, sometimes passes over ammo or a health kit, throws bricks and bottles to stun humans, and stabs anyone who grabs Joel. Once she has a gun she shoots at hunters on her own. Joel lifts her to high ledges so she can drop ladders and open doors from the other side.
You control Ellie in Lakeside Resort, the winter chapter, where she hunts deer with a bow, fights infected beside a stranger named David and later has to survive entirely on her own. She is weaker than Joel in a brawl and cannot grab enemies from behind, so she relies on stealth, her knife and thrown objects. Left Behind puts you in her shoes again at the Colorado Mountain Plaza mall and in flashbacks with her best friend Riley at Liberty Gardens in Boston.
By winter Ellie carries a small collection of keepsakes: her mother's letter, the switchblade, Riley's Firefly pendant, her Walkman, the joke books and a photo of Joel and Sarah that she takes from Tommy's place in Jackson without asking.
Riley turns after the night they are both bitten, and Tess, Sam and Henry die on the trip west, which leaves Ellie with heavy survivor's guilt. In the winter she trades deer meat to David for penicillin that saves Joel, then learns his group are the cannibals from the university. She kills James to escape and finally hacks David to death in a burning restaurant, where Joel finds her.
Ellie nearly drowns in the flooded tunnels outside Salt Lake City and is carried off by the Fireflies for surgery that would kill her. She wakes up in the back of Joel's car with no memory of the hospital. On the walk into Jackson she tells Joel about Riley and asks him to swear his story about the Fireflies is true. He does, and the game leaves it open whether she believes him.
The Quarantine ZoneThe Quarantine Zone starts the story proper 20 years after the outbreak, inside Boston's military-run zone in August 2033. As Joel, now a smuggler, you and his partner Tess slip outside the wall to track down Robert, a dealer who owes them guns, and end up taking a new job from the Fireflies.
Lakeside ResortLakeside Resort jumps to winter and puts you in control of Ellie near Silver Lake, Colorado, hunting with a bow and searching for medicine. She runs into two strangers, David and James, and for part of the second half the game switches you back to Joel.
Bus DepotBus Depot opens in the spring of 2034 as Joel and Ellie walk into Salt Lake City, aiming for the Fireflies at Saint Mary's Hospital. The route runs along a highway full of dead cars, through the Logan James bus station and an abandoned quarantine zone, and down into a flooded tunnel full of infected.Joel Miller
Joel Miller is the man you play for almost all of The Last of Us Part I. A hardened smuggler in the Boston quarantine zone, he takes a job escorting 14-year-old Ellie out of the city, and the drop-off turns into a year-long trip across the country to find the Fireflies.
Callus
Callus is the horse Joel and Ellie ride from Jackson County to the University of Eastern Colorado and beyond. He first carries Joel when Ellie runs off in Tommy's Dam, and Ellie names him on the road to the university.
Riley Abel
Riley Abel is Ellie's best friend from the military school in the Boston quarantine zone and the co-star of the Left Behind DLC. She appears in the Liberty Gardens flashback chapters Mallrats, Fun and Games and Escape from Liberty Gardens, and Ellie brings her up during the main story.
Winston Asher
Sergeant Winston Asher is a FEDRA soldier who once kept a camp and a horse in Boston's Liberty Gardens mall. In Left Behind, Ellie and Riley find his empty camp in Mallrats, and his notes show how he saw the two girls.