Grand Theft Auto 6's Aug. 27 extended gameplay preview, which aired on Netflix, put unusual emphasis on the relationship between its two protagonists, Jason and Lucia. Alongside gunfights and car chases, outlets including GamesRadar+, Kotaku, and Polygon noted scenes of the couple negotiating everyday domestic moments — choosing outfits, riding in cars together, holding hands while walking, and talking through their feelings before a job or a social outing. In one scene highlighted by GamesRadar+, Lucia tells Jason, "Relationships are about communication, Jay," while the pair drive to a dinner with an older couple named Brian and Lori.

Speaking to IGN, Rockstar North co-studio head Rob Nelson explained that Jason and Lucia's bond is governed by a dedicated relationship system, separate from the game's criminal tracking system. According to Nelson, as reported by IGN, Eurogamer, and Rock Paper Shotgun, players nurture the relationship by spending time together in the open world — activities cited include playing pool, mini golf, kayaking, jet skiing, base jumping, and robbing stores or banks together. Ignoring texts from one character to the other, even about mundane matters like locking up the house, can have a negative effect, per Nelson's comments to IGN.

Nelson said the story begins with Jason and Lucia deciding to "give it a shot," but simply playing through main missions isn't enough to keep them close — open-world interaction is required to reinforce the bond. Polygon, citing Nelson's remarks to IGN and The New York Times, added that the pair need to earn money outside main missions through activities such as monster truck races, pool, or treasure-hunting via scuba diving, and that the game tracks how players treat their partner and how violent they are.

Despite this system, several outlets reported that Jason and Lucia cannot actually be broken up. Nelson told IGN, as relayed by GamesRadar+, Eurogamer, and Polygon, that "they will remain partners in crime" regardless of romantic closeness, and that the narrative requires them to stay together and work together for most of the story. There is reportedly no direct gameplay benefit to a strong relationship, but Nelson said how the relationship is nurtured — or neglected — will affect how their story unfolds. Nelson also said players can choose to keep the pair as platonic partners rather than romantic ones, and described the system as something Rockstar didn't want to "foist upon players."

Eurogamer and Rock Paper Shotgun both noted that players can split the two characters up to move around the city independently, which can help evade police in the game's redesigned Wanted system when officers are specifically searching for a couple. Nelson also told Eurogamer that Rockstar considered expanding beyond GTA 5's three-protagonist structure but settled on two linked characters to avoid diluting player connection to each one, describing GTA 6 as "a story about a couple on the run." Coverage from Eurogamer and Rock Paper Shotgun also noted that the game's release comes amid ongoing labor disputes at Rockstar, including the firing of dozens of staff and unionization efforts by affected workers, with some outlets noting a legal fund set up by former employees ahead of a trial. GTA 6 is scheduled for release on Nov. 19 for PlayStation 5 and Xbox Series S/X.