Post of info!
Look at me getting this done reasonably early.
So, Murdoch Mysteries is this Canadian police drama set in 1890s Toronto. William Murdoch is, as one might expect from the title, the main character, a detective out of Stationhouse #4 in the Toronto Constabulary. He's basically a huge science nerd who uses forensics to solve crime instead of just beating confessions out of people like most of his contemporaries seem fond of doing. He spends a lot of time building things like lie detectors and night vision goggles. In 1895, yes.
Of course, since he's a teenager and thus like 20 years pre-canon he's not a detective yet, just a kid with an obsession with science and medicine.
After his mother died when he was about six, Catholic nuns took him away from his father (who was kind of a hopeless drunk) and sent him off to a Jesuit orphanage in Montreal to be raised there. Soooo, yep. He's pretty dedicated to his faith, to the point where he might well get all judgemental on people about certain things- like drinking or premarital sex or whatever. He's also, like many others in Fandom, got a boatload of Daddy Issues stemming from the fact that he thinks his father is indirectly responsible for his mother's death. That is unlikely to come up in casual conversation, but it's there in the background.
Teenage William is coming to Fandom because, like many gifted kids throughout history, he gets bored enough with regular classes that he starts being disruptive and ends up landing himself in trouble rather a lot. The Jesuits, fond of education as they are, realise he's just not being *challenged* enough and so pack him off to boarding school in the United States.
As far as the vital stats go, he was born in 1864 (three years before Confederation!) and has just turned 14 a little over a month ago. He's got dark brown eyes and hair (because he's TV!Murdoch and thus played by Yannick Bisson and not Peter Outerbridge) and is a bit on the shortish side at 5'4". He speaks English and French fluently and while he can usually be found with his nose buried in a book or technical journal of some sort (if he's not actively trying to build some contraption) he's done a bit of competitive boxing which means he's still a nerd, but he's a physically fit nerd who can hold his own in a fight against the average, non-powered person.