"Reigns: Game of Thrones" doesn't have a roster of separately "unlockable" characters in the way a fighting game does. Instead, you play as a single ruling character at a time (starting with a young King or Queen figure inspired by the Game of Thrones world), and the game's structure revolves around cycling through generations and storylines rather than picking from a cast.
That said, the game does have a form of progression that feels like "unlocking" content:
- Multiple starting scenarios/eras: As you play and die (a lot — dying is core to the game), you progress through different chapters or eras of the story, which can change who you're playing as and what kingdom-level context you're in.
- Special cards and story branches: Certain achievements, decisions, or reaching specific "ending" cards trigger new story arcs, symbols, or icons that appear on the bottom of the screen (tracking counters like faith, army, gold, and population). Filling these counters or hitting zero on them leads to different deaths and unlocks new narrative branches.
- Icons/emblems: Progress is often measured by collecting special icons that appear as you complete milestone events. These open up new card decks and storylines tied to Westeros lore (houses, characters like Stark, Lannister, Targaryen influences, etc.), rather than a literal "character select" screen.
- No completionist unlock-all cheat: There's no code or purchase that instantly grants "all characters" — progression is tied to actually playing through runs, dying, and letting the branching narrative unfold.
If you're looking for a specific playable-character swap feature, it's likely you're thinking of a different Reigns title (such as "Reigns: Her Majesty" or "Reigns: Three Kingdoms") or a fan mod, since the core Game of Thrones edition focuses on narrative branching tied to one ruler's card-based reign rather than a multi-character roster you unlock and choose between.