This sounds interesting, something akin to a writing exercise I've heard about, where two writers send parts of a story back and forth in an attempt to make a complete story, though this would be different in the sense that each writer would both take hold of a single character, I'd imagine.
So, let me just say, I've always been a fan of Roleplaying, and I find that video games, and even tabletop roleplaying can be restricting, which is why I occasionally enjoy forum roleplaying, so that there is absolutely no limits to a roleplay. I typically tend to lean towards fantasy or...