Jim Moriarty would probably be amazing at deductions if he weren't so overly concerned with facts. Unlike Sherlock he takes the time to gather information on people so he has it all right there in black and white. This means that he's going to be doing a lot digging in network posts, especially when he wants information on those he's taken a special interest in.
Please see
his character info for a detailed explanation of his dormant and inherent abilities.
Jim's dormant ability makes him the master of disguise, making him unrecognizable as Jim Moriarty when he's donned a temporary persona. There are limitations and it will not be used for creating any sort of permanent secondary persona (unless it's plot related, and that will be handled on a case-by-case, plot-by-plot basis). So no need to worry about Richard Brook paying us a visit.