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James Moriarty

James 'Jim' Moriarty is everyone's beloved semtex-happy consulting criminal. He is alluded to throughout the first two episodes of Sherlock and finally appears in person during the finale as the major antagonist of the series. But don't let that put you off! Although he's based on the infamous James Moriarty from the Sherlock Holmes stories by Sir Arthur Conan Doyle, he's actually pretty cheery and nonchalant about the whole 'leader of a criminal empire' thing. As one of the only men who can ever go toe-to-toe intellectually with Sherlock and come out on even footing, he's just a tad narcissistic and so his morals are just slightly unhinged.

But he's still a nice, functioning member of society. Really.