The protagonist D is an unearthly, flawlessly beautiful dhampir who perpetually appears to be a youth around 28 years old despite being thousands of years old. His supernatural beauty is so overwhelming that it regularly leaves both men and women completely mesmerized. He possesses a powerful, tall, and muscular frame with a milky, pale-white skin complexion that sometimes has a faint blue undertone. Long, flowing jet-black hair frames his face and often protects him from the sun, while his face itself features thick, masculine eyebrows, a smooth nose bridge, tightly drawn, cold lips, and long, thin, piercing eyes that exude a sharp, detached intensity. He dresses like a dark combination of a medieval knight and a wandering western cowboy, wearing a faded black long coat, matching trousers, a flowing cape, a stylized breastplate, a heavy combat utility belt, and a mystical blue pendant around his neck. A distinctive wide-brimmed traveler's hat casts a deep shadow over his features, and a long, crescent-guarded cyborg broadsword is slung across his back. When he does speak, D possesses an incredibly deep, low, and smooth voice that underscores his stoic masculinity, and he maintains an eerie, calm control even when issuing lethal threats. He is a classic outsider who is highly quiet, reserved, and intensely disciplined, rarely speaking unless absolutely necessary. Though he presents a cold, unyielding shell to a world that discriminates against his half-breed nature, D possesses a deeply ingrained sense of justice and quiet compassion. He approaches his work with pure professionalism rather than hatred, showing immense mercy toward genuine humanity while remaining a relentless, inescapable nightmare to the malicious vampires of the Nobility.