Can the Obstacle Character be one thing for a time and then hand off to another player in Grand Argument Story? In other words, does OC have to be there from start to finish in the same player?
The Obstacle Character function can be handed off successfully from one Objective Character to another, but it is tricky. There is a section in the theory book on “hand offs” and it covers this topic pretty well. The idea is that the Obstacle Character function has to be felt throughout the entire story, whether they are actually present or not. The Obstacle Character is a presence whose impact is felt by the Main Character, forcing the Main Character to face their personal problems. This function can be held in one player and then picked up by another, but the same appreciations have to be at work in both players when they are being the Obstacle Character; i.e. the same Concern, Range, Problem, Solution, Critical Flaw, Stipulation, etc.. If two characters in your story carry this function, then they should never meet in the same scene because it will feel like you have two of the same character in there. In a hand off, it is probably best to have the original Obstacle Character drop b