It has been revealed that the second playable character joining Geralt in The Witcher 3 will be Ciri, the silver-haired elf, the wild hunt are pursuing because of her ancient bloodline. Ciri is no protagonist. While she will be playable,
Geralt still steals the show and it isn't yet clear exactly how her story will unravel within the game. Ciri has been introduced as a crucial part of the plot but she's only playable during certain moments in the game to lend different perspectives to the story, but that "the game is still about [Geralt] , his story, and how you, as the player, choose to face the choices and encounters in front of you."