David's group are a group of survivors from a town at Silver Lake, Colorado who hunt Joel and Ellie through the winter. You fight them at the University of Eastern Colorado, in Left Behind at the Colorado Mountain Plaza, and around Lakeside Resort.
They capture travelers and eat them to get through the winter. The same kind of desperate survivors attack Ellie at the Colorado Mountain Plaza in Left Behind.
Ellie is smaller and weaker than they are. If you trade blows, they block after a couple of strikes and choke or punch her down, much like clickers do to Joel. Pick them off with stealth, and let the infected soften them up where both are present.
The group votes on decisions and holds town meetings, and members often act on their own, chasing Joel and Ellie to avenge friends they lost. The group includes women and children, rare outside the quarantine zones.
The group is led by David, with James as his second in command. After the university fight leaves Joel badly hurt, Ellie trades with David and James for medicine, but the group later captures her. Joel recovers, forces the location out of two cannibals at the cabins and tracks her to the town, while Ellie escapes, kills James and then kills David in the restaurant with his own machete.
Image: Naughty Dog / PlayStationBloater
Bloaters are stage four infected covered in armor-like fungus. They are slow and blind but kill you instantly if they grab you, and they throw bursting sacks of mycotoxin from range. Fire is the way to beat them.
Fireflies
The Fireflies are the militia fighting FEDRA's rule and searching for a cure, led by Marlene. Their slogan, look for the light, is painted across the ruins, and their deal with Joel and Tess to smuggle Ellie out of Boston starts the story.
Infected
The Infected are people taken over by a mutant Cordyceps fungus, and they are the main threat between every human fight in The Last of Us Part I. In Part I and Left Behind you meet four stages: runners, stalkers, clickers and bloaters, each harder to kill than the last.
Runner
Runners are stage one infected, people turned within the last couple of days. They still see, move fast and swarm in packs, so the danger is numbers rather than any single runner.