| Role | Co-protagonist |
| First appearance | Trailer 1 (Dec 2023) |
| Base | The Leonida Keys |
| Background | Ex-Army |
| Works for | Brian Heder |
| Status | Officially confirmed by Rockstar |
"Grew up around grifters and crooks. Tried the Army to shake things off. Now he wonders if it's time to try something new." — Rockstar's official bio
Jason Duval is one of the two playable protagonists of Grand Theft Auto VI, alongside Lucia Caminos. Per Rockstar's official character bio, Jason grew up around grifters and crooks and joined the Army to shake off a troubled adolescence — making him the first confirmed military-background protagonist in the series' history. The Army didn't fix anything: he washed up in the Leonida Keys, doing what he knows.
At the story's start, Jason works for Brian Heder, a veteran drug smuggler from the golden era of trafficking in the Keys. Rockstar's bio describes the arrangement plainly: Jason lives rent-free in a property Heder owns in exchange for helping with local shakedowns — and stopping by for sangria made by Brian's wife, Lori. It's a small, stuck life. Then he meets Lucia.
Rockstar's official synopsis frames the whole game around the pair: "Jason and Lucia have always known the deck is stacked against them. But when an easy score goes wrong, they find themselves on the darkest side of the sunniest place in America, in the middle of a criminal conspiracy stretching across the state of Leonida — forced to rely on each other more than ever if they want to make it out alive."
The official trailers show Jason running jobs alongside Lucia — including robbing a liquor store together — and behind the wheel during getaway driving sequences. Rockstar has confirmed the story switches between Jason and Lucia, with some missions playable as a duo.