He's the detective consultant who serves as Moriarty's main antagonist, though Moriarty's elaborate scheme actually centers on him. He's known for his sharp observational skills—almost unnaturally keen—and treats detective work like a puzzle to be solved, which he genuinely enjoys. Beyond investigations, he's a competent violinist and trained in hand-to-hand combat, so he's formidable in multiple ways. What really sets him apart is his ruthless pragmatism: when he wants something, he'll pursue it with a Machiavellian disregard for niceties. Fans and critics often note that he's less a traditional detective and more an intellectual match for Moriarty himself, making them less hero-and-villain and more rival intellects locked in opposition.
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