Michael is the youngest son of the Corleone family and a decorated World War II Marine veteran. He currently attends Dartmouth College and actively avoids any involvement in his family's illegal operations. Highly intelligent and observant, he stands out from his siblings through his quiet demeanor and his desire to assimilate into mainstream American society. His outsider status shifts dramatically when a crisis threatens his father's life.

Vito is the powerful patriarch of the Corleone crime family, respectfully known as the Godfather. He controls a massive syndicate involving gambling and union influence, built on a strict code of personal honor, loyalty, and favors. Despite his criminal occupation, he maintains a reasonable, diplomatic outward demeanor and acts as a traditional family man who refuses to involve himself in the narcotics trade.

Tom is the acting consigliere and legal counsel for the Corleone family. Taken in off the streets by Sonny when they were boys, he grew up as an unofficial adopted son to Vito and Carmella. His German-Irish heritage makes his high-ranking position unusual in the Mafia underworld, but he compensates with his sharp legal mind and unwavering devotion to Vito's methods.

Kay is a college student from a respectable, affluent Protestant family in New Hampshire. As Michael's girlfriend, she represents the legitimate American life he wishes to build away from his father's empire. She finds the reality of the Corleones' criminal connections difficult to fully comprehend at first, treating the stories with disbelief.

Sonny is the physically imposing eldest Corleone son and the presumed heir to his father's criminal empire. He is heavily involved in the day-to-day operations of the syndicate and possesses a natural talent for street-level warfare. However, his volatile temper and inability to conceal his emotions severely compromise his strategic judgment during times of crisis.

Sollozzo is a dangerous and ambitious criminal operator backed by the rival Tattaglia family. He seeks Vito's political protection and capital to establish a lucrative drug ring in New York. When his business proposal meets resistance, he employs ruthless, decisive tactics to force the Corleones into compliance.

McCluskey is a corrupt New York police captain who provides armed protection for Sollozzo. He justifies taking bribes as clean graft and uses his badge to shield his criminal associates from retaliation, making him a complicated target for the Corleones, who generally avoid killing law enforcement.

Fredo is the middle son of the Corleone family. He lacks the ruthless strength of Sonny and the sharp intellect of Michael, making him less suited for high-level leadership. Following a severe shock to the family, he struggles to cope and is sent out West to manage the family's casino and hotel interests.

Connie is the youngest child and only daughter of the Corleone family. Her lavish wedding reception serves as the gathering point for the entire criminal syndicate and local community. She enters into a turbulent and abusive marriage with Carlo Rizzi, facing tensions as her husband feels excluded from her family's inner circle.

Carlo is a half-Sicilian man from Nevada who operates a small-time bookmaking operation on the Upper East Side. He marries into the Corleone family expecting to be brought into their lucrative operations, but Vito keeps him sidelined. This exclusion causes Carlo to harbor deep resentment, which he takes out on his wife.

Carmella is Vito's wife and the traditional matriarch of the family. She strictly separates her domestic life from her husband's criminal enterprise, preferring to spend her time attending daily mass to pray for his soul. She provides a model of quiet endurance for the other women in the family orbit.

Clemenza is a senior caporegime and one of Vito's oldest friends from their early days in Hell's Kitchen. He commands a regime of soldiers in the Bronx and oversees the training of younger recruits. He approaches his violent profession with a jovial, matter-of-fact attitude.

Tessio is a senior caporegime who commands the Corleone interests in Brooklyn. He is generally quieter and more strategically minded than Clemenza. His long history with Vito makes him a highly respected figure during times of peace and war within the organization.

Luca is Vito's most feared and lethal enforcer. His absolute, almost fanatical loyalty to the Godfather makes him a cornerstone of the family's military strength. Operating largely alone, he is sent to infiltrate rival factions to gather intelligence due to his intimidating reputation.

Johnny is a famous singer, actor, and Vito's godson. Facing a declining career and vocal issues, he turns to his godfather to secure a highly coveted film role. His reliance on Vito highlights the far-reaching influence the Corleone family exerts beyond the criminal underworld and into Hollywood.

Bonasera is an Italian undertaker living in New York who traditionally avoided the Corleone family to stay lawful. When the legal system fails him, he swallows his pride and approaches the Godfather on the day of Connie's wedding. He learns the heavy weight of owing a favor to the local mafia.

Genco is Vito's childhood friend and original consigliere. He works alongside Vito from their early days in Hell's Kitchen to build the Corleone empire. He spends his final days in a hospital bed as his administrative duties fully transition to Tom Hagen.

Paulie is a Corleone enforcer who serves as Clemenza's protege and a driver for Vito. His position grants him intimate knowledge of the Godfather's daily movements and vulnerabilities.

Woltz is a powerful and arrogant Hollywood studio executive. He adamantly refuses to cast Johnny Fontane in a major war film due to a personal grudge, until the Corleone family applies a gruesome pressure tactic to change his mind.

Barzini is the powerful and highly respected Don of one of the rival New York Mafia families. He operates with subtle strategic intelligence, often pulling the strings behind major conflicts while letting others take the public blame.

Tattaglia is the head of the Tattaglia crime family. He backs Sollozzo's narcotics venture, putting his organization in direct, violent conflict with the Corleones. He is generally viewed by other dons as less capable than Vito.

Bruno is Phillip Tattaglia's son and a key operator in the family's nightclub interests. He actively aids Virgil Sollozzo in his aggressive moves against the Corleones.

Apollonia is the beautiful daughter of a café owner in a small Sicilian village. She lives a highly sheltered, traditional life until she captures Michael's attention during his stay overseas, sparking an intense romance governed by strict local customs.

Nino is Johnny Fontane's childhood friend and former singing partner. While Johnny achieved massive fame, Nino worked as a truck driver before Johnny brings him to Hollywood. He struggles with severe alcoholism and a deep distaste for the entertainment industry's culture.

Lucy is a young woman who enters into a passionate, reckless affair with Sonny Corleone. Following the tragedies that strike the family, she eventually relocates to Las Vegas to start over, operating on the fringes of the Corleone hotel business.

Jules is a skilled doctor forced to practice in Las Vegas after performing illegal abortion procedures in New York. A friend cashes in a favor with the Corleones to save his career, deeply entangling him with the family's western expansion.

Albert is a former policeman with a history of using excessive force. When his career ends in a manslaughter charge, his family uses Corleone connections to protect him. He transitions into a fiercely loyal, highly effective enforcer role for Michael.

Moe is a hot-tempered former hitman who owns the Las Vegas hotel where Fredo works. He aggressively resists the Corleones' expansion efforts into Nevada, underestimating the changing power dynamics of the family.

Tommasino is a Sicilian Mafia chief and an old associate of Vito Corleone. He provides a safe haven for Michael when he is forced to flee New York, facilitating his integration into traditional local culture.

Rocco is an ambitious soldier in Clemenza's regime who quickly rises through the ranks by proving his reliability and cold efficiency when handling difficult assignments for the family.

Filomena is a Sicilian midwife who previously lived in New York. She shares a dark piece of Corleone history with Michael regarding Luca Brasi and explains how Vito personally saved her life.

Felix is a condemned man from the fiercely loyal Bocchicchio clan. He is utilized in a strategic legal maneuver by the Corleones, who secure financial stability for his family in exchange for his cooperation in taking the blame for a high-profile crime.