Those who witness how he operates sometimes comment that his work is divine.
He is very perceptive and able to diagnose a patient with only one look. Although he charges absurd amounts of money for his procedures, he performs free surgeries on people who touched him with their kindness or struggles in life. Many people assume that Black Jack is a rude and soulless person because of his appearance and first impressions, but in reality he is a very compassionate and dedicated person.
He lives in the richest house on an island off the coast of Osaka, Japan with his adoptive daughter Pinoko and his pet dog, Largo. Kuroo has adopted a young conjoined twin girl named Pinoko and his pet dog, Largo, who were also adopted by him. As he grows older, he continues to grieve her death. The young boy is present when his mother, Mio, dies in a beachside explosion, and he mourns alongside her. Honma, Kumiko's father, works with him in their rescue operation. Black Jack was taken to the hospital and later, Kuroo was taken to the emergency room while his mother, Mio, was taken to the operating room. Kuroo found the giant bomb and his mother, Mio, was scared and screamed.
One day, there was a bomb left in the sand floor by The Evil Gang. When Kuroo was a baby, he and his mother played ball on the beach.
