47 characters in The Last of Us Part I.
Anna
Anna is Ellie's mother, known only through a letter Ellie carries and a few remarks from people who knew her. You can read her letter, the Note from mom artifact, from Ellie's backpack at the start of Lakeside Resort.
Bill
Bill is a paranoid survivalist and mechanic who lives alone in Lincoln, a town he has rigged with traps against the infected. He owes Joel favors from their smuggling deals, so in Bill's Town Joel asks him for a car, and Bill joins you to find the parts.
Blondie
Blondie is one of David's men in Silver Lake, a member of the group that hunts Joel and Ellie through the winter. Joel runs into him at the cabin resort in Lakeside Resort while searching for Ellie, and questions him alongside Skully.
Buckley
Buckley is the dog at Tommy's hydroelectric dam in Jackson County. You meet him in Tommy's Dam outside the generator building as Tommy walks Joel to his office, and Joel can stop to pet him.
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.
Corporal "Dickhead"
Corporal "Dickhead" is the nickname Ellie and Riley give a FEDRA officer at the Boston military boarding school. He is only talked about in Left Behind, as the man who took their water guns away.
Danny
Danny is one of the two guards of Ish's community in the Pittsburgh sewers. You learn about him from the Kid's drawing, found in the sewer nursery during The Suburbs.
David
David is the soft-spoken leader of a group of survivors near Silver Lake and the main threat of Lakeside Resort, the winter chapter where you play as Ellie. He meets her while she is hunting, trades her penicillin for deer meat, and fights infected beside her.
Drew Beckwith
Drew Beckwith is the dead pharmacist Ellie finds in Left Behind, locked in the American Princess store at the Colorado Mountain Plaza. You need the Pharmacy key from his body in Back in a Flash to open the drugstore and keep going.
Ellie Williams
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.
Ethan
Ethan is a Firefly soldier at Saint Mary's Hospital in Salt Lake City. In The Firefly Lab he finds Joel and Ellie after they arrive, and Marlene later puts him in charge of walking Joel out of the building.
Eugene Ellis
Private Eugene Ellis is a soldier from a FEDRA helicopter crew that crashed at the Colorado Mountain Plaza. In Left Behind, Ellie pieces together his story from his captain's notes and his own recordings while searching the mall for a medical kit for Joel.
Frank
Frank is Bill's former partner in Lincoln. You learn about him in Bill's Town through the Note from Frank, and he also turns up earlier in The Outskirts as the contact named in a smuggler's note.
Henry
Henry is a young survivor from Hartford who is trying to get his little brother Sam out of hunter-held Pittsburgh. He and Joel get off to a bad start in a brawl, then team up to escape the city, and he fights beside you through the end of Pittsburgh and The Suburbs.
Ish
Ish is a survivor you never meet in person: you learn his story from a trail of notes in The Suburbs, from his wrecked fishing boat on the riverbank to the sewer camp he built under Pittsburgh. Picking up his notes in order tells how one lonely man built, and lost, a community.
James
James is David's right-hand man in the group of survivors Ellie runs into near Silver Lake during Lakeside Resort. He is hunting with David when they meet her, and he is the one sent back to their settlement for the penicillin she needs for Joel.
Jeremy
Jeremy is a FEDRA soldier in Pittsburgh, mentioned in the Lost Hill note you can find in the Pittsburgh chapter. A squadmate writes that Jeremy and a soldier named Pam were left behind when the hunters took Troy Hill.
Jerry Anderson
Jerry Anderson is the lead doctor of the Fireflies at St. Mary's Hospital in Salt Lake City, the man in charge of their research into a cure. You only meet him near the end of the game, in the chapter The Firefly Lab, and his part in the story is best discovered by playing it.
Jimmy Cooper
He is the first infected you see in the game, during the outbreak night in Hometown.
Joe Warren
Joe Warren is the only named bloater in the game. He lurks in the spore-filled lower floors of the dormitory at the University of Eastern Colorado, and you have to kill him to collect Warren's Firefly pendant in The University.
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.
Kari
Kari is a Firefly surgical assistant at Saint Mary's Hospital in Salt Lake City. You meet her in the operating room at the end of The Firefly Lab, where she is helping the surgeon Jerry Anderson.
Kyle
Kyle is a father from the Pittsburgh suburbs who joined Ish's community in the sewers. In The Suburbs you learn his story from the Looting note and the Cornered note, and Ish mentions him in the Rain catcher note.
Larry Caulfield
Chief Warrant Officer Larry Caulfield is a member of the FEDRA helicopter crew that crashed at the Colorado Mountain Plaza. In Left Behind, Ellie learns what happened to him from Captain Regan Francis's notes.