However, if you're already a bit into the campaign and don't want to start completely over, the secondary player is able to take control of a character in your party. (gameranx.com)
Suddenly not being completely in control of your character took a backseat to a great narrative. (mammothgamers.com)
But in practical terms, the writer loses control of a character as soon as the script is produced and the producer and director take over. (chicagoreader.com)