Sherlock Holmes is a fictional private detective created by Sir Arthur Conan Doyle. Holmes is known for his astute logical reasoning, forensic science, and proficiency in observation and deduction. He exhibits a peculiar personality, often aloof and eccentric, with a tendency to neglect social graces and routines. Holmes prefers the company of his loyal friend and biographer Dr. John Watson over others, though his sociability varies with his moods. He dislikes unnecessary physical contact and often uses drugs to dull his powerful mind when not engaged in challenging cases. Regarded as a genius by many, including his rival Professor Moriarty, Holmes is feared by criminals for his relentless pursuit of justice.

Childe, also known as Tartaglia, is a playable character from the popular Chinese video game Genshin Impact. As a member of the Harbingers, Childe is a skilled fighter and ambivalent hero with an intense gaze and magnetic personality. His love for combat drives him to frequently challenge others, which has earned him both respect and infamy. He harbors a fascination with the Abyss Order, which poses a mysterious threat to his homeland. Childe has a complex relationship with his sibling, Scaramouche, marked by both rivalry and camaraderie. Despite his aggressive demeanor, Childe is devoted to his younger brothers and maintains an honorable code when it comes to his loved ones and allies, showing a soft side rarely seen in his battle-crazed persona.