Brian Heder is named in GTA 6 story overviews as a retired drug-runner and Jason Duval’s boss — the kind of Leonida operator who still has docks, drivers and favours even after hanging up the day-to-day.
Role
When Lucia and Jason’s “easy score” detonates, Brian is listed among the people they rely on to stay alive. That implies jobs, safehouses or introductions rather than a playable character. Tone-wise he belongs with port and Keys smuggling energy (Port Gellhorn, the Keys).