So last night's game was something of an experiment.
I'm usually pretty guarded with my game/story/plot settings. Historically, I've liked to retain pretty tight control over what is and isn't present in the game world, and I'd say that, for the most part, that's still pretty true. I don't think there's anything wrong with this, and its greatest virtue is that it guarantees a certain level of internal consistency.
In recent games, though, I've been a bit looser with allowing the players to "make stuff up" for me to incorportate into the world while keeping it a cogent whole. Last night added a new level.
A friend of ours from our annual Meetups was in town for the weekend, and we asked him if he'd like to join our game for the night. I'm usually pretty easy with letting "guest" players come in and out. This time, though, I gave Reinholdt a choice: I told him he could either be a character that was basically in line with the party (and would be much more in the foreground), or he could play the part of the primary antagonist - which was going to be more of a puppetmaster role. Since Reinholdt is, in fact, a cylon, he of course chose the latter.
So I had a new PC at the table playing the part of a character that I had carefully constructed and designed specifically for the situation the characters have been dealing with for about 10 games or so. I tried to explain the character as best I could, but of course someone else is always going to interpret the facts differently. It was interesting watching someone else interpret it, as well as giving control of the primary villain to someone else at the table.
Reinholdt did a great job. He spent most of the game passing me notes telling me all the things he was trying to do behind the scenes to confound the PCs. Actually, a lot of his suggestions made the game. He did some things I wouldn't have, of course, but I'm prepared to roll them into the canon.
He did a really good job of being a creepy devil lord.
I thought so. I'm trying to remember all the things he told you. I may have to consult the stenographer. ~PS