Munny was, in his youth, a dangerous man, prone to consume alcohol in excess. He often killed people, while intoxicated, and many times either had no memory of the murders, or simply chose not to remember. He possesses an ability to kill without remorse in his youth, but was never one to go into a fight with a strategy, but rather simply acted or reacted based on the circumstances at the time. This made him unpredictable and deadly. While a young man, Munny becomes involved in acts of armed robbery and killer for hire contracts, and on more than one occasion he has killed not only men, but women and children, as well as burned homes and barns. His reputation makes him one of the more feared men in the West.