I've had this witch!Jim AU floating around in my head for the past year or so, where Carl Powers was found dead in the pond near Sherlock's village with a hex bag in his pocket and Sherlock was the only one who believed it could be a witch, eventually Jim moves to the big city and starts organizing crimes using his magic and Sherlock becomes a witch hunter who pursues him with his medic John. I started drawing it and he turned into Kiki, this isn't exactly what I have in mind for the original AU but it makes a cute concept.
Thirteen year old Jim Moriarty is a witch leaving home for the first time for the big city to get in touch with his powers. In London, he finds himself drawn to people with problems and discovers he has a talent for solving them in the most elegant ways, but one day he gets too close to some dangerous people and is injured. Rather than ceasing his activities, the scare intrigues him and Jim begins to build an empire through magical disguises and charms, intending to elevate himself above all harm, but little does he know, an aspiring detective is hot on his heels.