Here's the background - one of the players have to leave town for an exchange programmee lasting 6 months, but I have already filled his slot with another player. We are thinking of ways to include him as a co-GM in my game.
Searching the Internet doesn't yield any advice on how to have a co-GM in the game. I am hoping to incorporate the co-GM as more than just a helper during combat, but I am falling short of how a co-GM can contribute in a game (besides splitting up the party).
Is it feasible to have a co-GM in any meaningful sense, and if so, how?
On reviewing the comments:
By co-GM, I don't mean "multiple GM". I still think of myself as the "lead GM", setting the direction of the campaign, determining who are the major enemies, allies and events of one session.
There are various duties a GM can have, including
- Role-playing NPCs in out of combat scenes
- Playing NPCs in combat scenes
- Adjudicating dice rolls and rules
- Deciding the direction of the game and plot
- Reacting to players' intent and spontaneous actions
So I guess the question is, how I can share those roles with another GM, while maintaining consensus when players try something new which we haven't planned for? We could decide on the NPCs' motivations, the scenes, the outline of the session and so on, but how do we improvise on the fly together without breaking the flow of the game, like taking a ten minutes break to confer with each other?
For further context, the system I am using is 13th Age.