Hi there! I'm Ali, I'm the mod, and I've got two kids here: Samuel Vimes and John Watson. I'm... gonna cheat and copy and paste some of my last intro.
If you haven't read the Discworld books, Sam is your quintessential man on the streets who's been moved up into command and still feels like the man on the street. He's the commander of his city's police force and he'll be doing that here, too, because he's incapable of not being a cop. Vimes pretty much dislikes everyone who causes trouble and therefore paperwork, but there isn't much of a difference in how he treats people he likes and dislikes, so.
John's from BBC's Sherlock, which is an update of Doyle's Sherlock Holmes stories. John's an army veteran and surgeon who's returned from Afghanistan; he comes from the beginning of the series, so he's literally just met Sherlock and therefore there's not a lot of history you need to know. He's starting up a clinic in town, so he'll be your doctor, should you need one. John's fairly easygoing and friendly in a polite sort of way, but since he is former military, I'm not sure what Sam will think of him.
I know absolutely nothing about Supernatural, I'm afraid, but welcome! Feel free to bug me if you have any questions/problems/ideas.