11 enemies in The Last of Us Part I.
Bandits
Bandits are rural raiders who live around Jackson County and attack Tommy's settlement and its hydroelectric dam. You fight them in Tommy's Dam, first at the dam and then at the ranch house.
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.
Clicker
Clickers are blind stage three infected that find you by the clicking sound they make. Their grab kills instantly unless you carry a shiv and have the Shiv Master upgrade, so most players deal with them quietly or with fire.
David's Group
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.
FEDRA
FEDRA, the Federal Disaster Response Agency, is the military government that runs the Boston quarantine zone. Its soldiers are the best-equipped enemies in the first chapters, and you fight them while smuggling Ellie out of Boston.
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.
Hunters
Hunters are the armed civilians who took Pittsburgh from FEDRA and now ambush anyone passing through to strip them of supplies. You fight them through the Pittsburgh and The Suburbs chapters.
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.
Smugglers
Smugglers move people, guns and contraband past FEDRA in the Boston quarantine zone. Joel and Tess are smugglers themselves, and the rival crew of Robert, an arms dealer, is the first group of humans you fight in The Quarantine Zone.
Stalker
Stalkers are stage two infected that hide, circle you and strike from cover. They keep a runner's sight and speed but fight harder, and in Part I they are rare: two main encounters for Joel and one in Left Behind for Ellie.