In terms of equal opportunities, of course, Moriarty's also a character whose appearance in canon is much more restricted than fanon - and I'm including professional fanon in this - would justify, too. But every time I read A Scandal in Bohemia I just think, "Where is Watson getting this stuff from?" I mean, he goes on about Holmes always sneering about the weakness of the female intellect, when Holmes has, in the previous book, observed about Watson's own wife "She would have done well in our line."