I'll put it bluntly: Jake Barnes steers almost everything in 'The Sun Also Rises'. He's the narrator, the moral center, and the one whose emotional paralysis gives the whole story its ache. Jake's impotence isn't just a physical detail — it shapes how he observes Brett, how he tolerates Robert Cohn's jealousy, and why he often chooses a kind of resigned stoicism. The plot unfolds through his eyes, so when he drifts through Paris, drinks in cafes, or watches the bulls in Pamplona, we follow his internal weather as much as the external events.
Brett Ashley functions as the story's irresistible engine. Her charisma and messy hunger for connection ignite nearly every conflict: Cohn's obsession, Jake's quiet suffering, Mike's financial and emotional unraveling, and the fateful attachment between Brett and the young bullfighter, Pedro Romero. Without Brett, there wouldn't be the emotional collisions that propel them from city to fiesta.
Then there are the side players who push scenes into motion. Robert Cohn arrives as an outsider with insecure attachment and boxing courage; his inability to fit sparks the Paris confrontations and Pamplona brawls. Mike Campbell amplifies the band's drunken farce and heartbreak, while Bill Gorton supplies the comic relief and caustic perspective. Pedro Romero changes the moral stakes in Pamplona — his presence brings purity, danger, and a tragic counterpoint to the expatriates' aimlessness. Put them together, and you have a tight ensemble where each personality nudges the plot forward; it's messy and alive, and I love how Hemingway makes character do most of the work.