Shiro

Shiro was one of four siblings and the only one to not live a successful life according to his mother.

History
His fathers dying wish was for his son to never be welcomed by his mother again, causing him to not visit her much, though he never stopped loving her. A good man at heart, Shiro was the only one of his brothers to made it to his mothers 60th birthday though she hesitated on letting him in. Despite his situation, he was cheerful enough and greeted Black Jack with a friendly and jovial disposition. When his mother collapsed, Shiro revealed himself to be a doctor and he and Black Jack treated his mother back to good health. Afterwards, he told his mother he was going to open a medical clinic near her house on the request of Black Jack.