Humans have unique and complex personalities. Human personalities develop as they progress through life. Each person has a unique personality development. In relation to personality development, this study discusses the personality development of the main character of the novel Wise Guy Life in A Mafia Family, Henry Hill.

The novel The Wise Guy Life in A Mafia Family by Nicolas Pileggi tells the story of Henry Hill's life journey from adolescence to becoming a famous mafia. This novel is inspired by Henry Hill’s true story. The life of being a mafia is far different from that of other normal humans. Fully amazing stories and challenges.

The researcher formulated two questions for this study. The first question discusses Henry Hill’s portrayal as the main character in the novel Wise Guy Life In A Mafia Family. The second question discusses the development of Henry Hill's personality in the novel Wise Guy.

The author uses several theories to analyze this problem. The first question was answered using Murphy’s characterization theory. Hurlock's theory of personality development was used to answer this second question.

This study has resulted in two discoveries. The first discovery was Henry Hill's portrayal of the novel Wise Guy Life In A Mafia Family. The second discovery was the development of Henry Hill's personality, which was loyal to the mafia group and a hardworking person, who turned into a traitor in the mafia group because he wanted to save himself.

Keywords: Henry Hill, personality development, mafia