Charles Augustus Milverton operates as a media mogul, journalist, and professional blackmailer, self-styling as the "King of Blackmail." His distinctive appearance features chin-length curly white hair, piercing yellow eyes, and consistent use of round pince-nez glasses without chains. He maintains a refined, sophisticated presentation through dark three-piece suits and a black fedora. Defined by calculated cruelty, manipulation, and a complete lack of empathy, he derives satisfaction from methodically exploiting secrets to ruin lives for profit and entertainment. Despite his malicious nature, he displays charismatic charm and cultivates sophistication, showcasing extensive knowledge of art, literature, and culture. Analytical perspectives categorize his traits as ENTJ and Enneagram Type 8w9, reflecting assertiveness, strategic thinking, and a desire for control and power. The character draws inspiration from Arthur Conan Doyle’s "The Adventure of Charles Augustus Milverton," where he was depicted as a notorious blackmailer despised by Holmes for premeditated cruelty, and from the real-life criminal Charles Augustus Howell. As a significant antagonist, his modus operandi involves identifying high-society individuals with damaging secrets, acquiring compromising evidence like letters or documents, and extorting them under threat of public exposure. He meticulously plans schemes prioritizing long-term profitability and fear among victims. During the "Phantom of Whitechapel" storyline, he observes William James Moriarty and his brother Louis after a confrontation, recognizes William, and initiates a covert investigation to uncover exploitable secrets. His actions position him as a common enemy for Sherlock Holmes and William James Moriarty. Holmes considers him one of his most reprehensible foes due to his crimes' cold-blooded nature, while Moriarty views him as a disruptive element to societal reform plans. Milverton’s blackmail threatens the nobility Moriarty targets, and his investigation risks Moriarty’s operations and identity. His narrative role exposes pervasive corruption in high society and forces temporary, indirect alignment between Moriarty and Holmes against him as a purer form of self-serving evil. Official media does not depict significant character development or changes in his motivations or methods. His background prior to appearance, beyond literary inspiration, remains unelaborated, and the anime adaptation leaves his ultimate fate unspecified.