Captain John Yossarian
The protagonist and moral center. Yossarian is a bombardier who wants to survive and is not ashamed of it. His selfishness is the novel's argument: in a system designed to kill you, self-preservation is the only honest position. His arc moves from desperate maneuvering inside the system to outright rejection of it.
Milo Minderbinder
The mess officer who builds a global black-market syndicate. Milo is the novel's sharpest satirical target. He applies pure market logic to war and finds that it works perfectly, even when it means bombing his own men. He never sees himself as doing anything wrong.
Colonel Cathcart
Yossarian's commanding officer, who keeps raising the mission count to impress his superiors. Cathcart doesn't hate his men; he simply doesn't think about them. His ambition is the engine that drives the plot's central conflict.
Snowden
A young gunner whose death haunts the entire novel. Snowden barely appears as a living character, but his wound and what it reveals become the emotional truth the book has been building toward. His death forces Yossarian, and the reader, to see the war without the comedy.
Major Major Major Major
A man promoted to major by a computer error who responds by making himself completely inaccessible. He only meets people when he is not in his office. His character is a direct parody of military hierarchy and the way rank creates absurd social rules.
The Chaplain
A timid, sincere man who genuinely wants to help but finds himself powerless inside the military structure. He represents the failure of good intentions when they have no institutional backing. He ends the novel with a small act of defiance, which Heller treats as meaningful precisely because it costs him something.
Nately
A young, idealistic soldier in love with a Roman prostitute who barely notices him. Nately's death is one of the novel's more straightforward tragedies, and it triggers a chain of consequences that follow Yossarian through the final section of the book.
Orr
Yossarian's bunkmate, who crashes his plane repeatedly and seems incompetent. The novel's final revelation is that Orr was practicing. He escapes to Sweden by rowing a life raft. His success reframes the entire novel and gives Yossarian a reason to run.