Sherlock is a tall man, standing at 185 cm, with pale skin and slight shadows beneath his eyes. Though relatively slender, he maintains a strong and athletic build, as noted by William Moriarty and shown during moments when he is shirtless.

He has dark blue, wavy hair that reaches his shoulders, which he typically ties into a ponytail. His eyes match the deep blue shade of his hair. Sherlock’s usual attire consists of a blue suit worn over a white shirt with the top buttons undone, forgoing a tie or waistcoat.

Following a three-year timeskip, Sherlock’s hair grows longer, now reaching down to his mid-back. He alternates between wearing it loose or tied in a low ponytail. His clothing style becomes noticeably more formal, featuring a dark coat, black waistcoat, and a black bowtie. Unlike his previous appearance, his white shirt is neatly buttoned up.

Sherlock Holmes is known for his eccentric but brilliant nature. He possesses extraordinary deductive abilities, capable of analyzing people and situations with remarkable speed and precision. His intelligence extends beyond observation, making him an exceptional strategist.

Despite his brilliance, Sherlock’s behavior is often perceived as strange, childish, overbearing, and at times shameless. Many individuals find it difficult to get along with him due to these traits, though Sherlock himself appears unconcerned and is unafraid to provoke others when it suits him.

His unconventional lifestyle reflects his personality. His living space is typically disorganized, and he displays little regard for social etiquette. William Moriarty deduces that Sherlock has a tendency toward substance dependence, a flaw hinted at by his frequent and sometimes excessive smoking.

Sherlock is deeply fascinated by mysteries and thrives on solving challenging cases. He often relies solely on his own judgment, sometimes bending or outright breaking the law by lying to the police, concealing evidence, or trespassing if necessary. His pursuit of the “Lord of Crime” becomes his greatest obsession, so intense that he is willing to risk his life to uncover the truth. Sherlock experiences deep frustration whenever he fears losing track of this mystery.

Despite his unorthodox methods and aggravating habits, Sherlock is fundamentally kind-hearted. He displays strong empathy toward victims and is deeply committed to protecting those he cares about. Guided more by his sense of justice than by the letter of the law, Sherlock judges actions based on what he believes is truly right. He grapples with moral dilemmas, particularly regarding the Lord of Crime, recognizing both the immorality of murder and the noble intentions behind it.

Sherlock also dreams of a more equitable world, lamenting how social standing often determines the fate of individuals regardless of their talents. His interest in science and forensics stems from his belief that, in science, only objective facts matter.

In more personal moments, Sherlock shows genuine gentleness and patience, especially during William’s recovery after the fall. He tends to William’s needs with care and encouragement. Following the time-skip, Sherlock matures significantly, displaying a more composed and courteous personality.

Little is known about Sherlock Holmes’s early life. He is a descendant of Sherrinford Holmes and the younger brother of Mycroft Holmes. Through their mother’s side, the Holmes family has working-class roots, a background Sherlock acknowledges with pride.

At some point, Sherlock attended one of the prestigious Oxbridge universities. Despite receiving an elite education, he retained his Cockney accent, never altering his manner of speech to match societal expectations.

Sherlock Holmes is based on the character of the same name from Arthur Conan Doyle’s Sherlock Holmes novels. In the original stories, Holmes is portrayed as an eccentric consulting detective who solves complex cases alongside his trusted companion, John H. Watson.

In Conan Doyle’s short story “The Final Problem,” Sherlock Holmes confronts Professor Moriarty, who is described as his intellectual equal and greatest adversary. This dynamic heavily influences Sherlock’s portrayal and rivalry with William James Moriarty in Moriarty the Patriot.