Karl Brandt

Karl Brandt was the Lawyer's subordinate, also known as "Secretary" due to his position as a politician's secretary in former East Germany. He was the only one who was left to help the Lawyer after he was injured by the police. It is evident that he was very loyal to his boss, as seen through his constant threats to take Tenma's life if he refused to treat him.

(Source: Monster Wikia)