Kuroo Hazama, known as Black Jack, is the enigmatic and brilliant unlicensed surgeon at the heart of the 'Black Jack' series. With a distinctive appearance marked by his half-black, half-white hair and facial scars, Black Jack is a masterful doctor who performs complex surgeries for exorbitant fees. Despite his cold demeanor, he is driven by a deep sense of justice and empathy, often helping those in dire need. His mysterious past and personal code of ethics make him a compelling and multifaceted character who navigates the moral complexities of life and medicine.