Doctor Kiriko, also known as Kiyoshi Kiriko, is a prominent character from the anime series Black Jack. Known as the 'Death Doctor,' he is the antithesis to the protagonist, Black Jack. Unlike Black Jack, who strives to save lives regardless of the cost or difficulty, Kiriko believes in euthanasia as a means to end suffering. His controversial methods often clash with Black Jack's ideals, making him a complex and thought-provoking character. Kiriko’s role in the series serves to challenge the ethical boundaries of medical practice and provoke deep philosophical questions about life and death.