Behind a cut, because I'm finding this interesting but most of you probably don't.
I've been running five characters in the background and letting them talk when I'm on the bus/walking to meet someone for lunch, and so far it's been excellent in terms of finding out more about their backgrounds and habits and even a bit about their motivations (surprisingly informative: working out what the hell they were wearing, and why) but five is maybe a bit much, especially when they know each other; basically, Lancelot is utterly useless if I run him at the same time as Gwen.
(Me: Hey, guys, these pink flowers I'm walking past. Like them?
Gwen: Yes!
Morgana: Yes.
Merlin: They're...nice flowers?
Arthur: *blank look*
Lancelot: Gwen would like pink flowers!)
Morgana and Arthur are also problematic because they can get uselessly out of hand: they wasted five minutes bickering about (ironically enough) which of them started an argument that they had at a party when they were fourteen.
I also got distracted convincing Gwen that she should invest in a pair of heels higher than two inches.
THIS IS WHY I DON'T USUALLY SIM. My imagination is excellent but it is very, very difficult to keep focused, and I also know that if I do it for too long then they'll become intrusive. I couldn't do it at all on a normal med school day.
I'm going to give it a bit longer and then maybe try it strictly one voice at a time, in the name of actually getting the fic done faster.