Pinoko is a central character in the anime series Black Jack, created by Osamu Tezuka. She is the loyal assistant and adoptive daughter of the enigmatic and unlicensed surgeon, Dr. Black Jack. Despite her childlike appearance and behavior, Pinoko is actually an 18-year-old who was surgically reconstructed by Black Jack after being a teratoma, a collection of cells with the potential to develop into a human being. Her unwavering devotion to Black Jack and quirky personality add a unique dynamic to the series, often providing comic relief amidst the intense medical drama.