Aida is the youngest sibling and only daughter of the powerful Gallo family. She acts impulsively to counter her family's underestimation of her capabilities, leading to chaotic choices that frequently cause trouble. Underneath her rebellious exterior, she possesses a strategic mind and feels a fierce loyalty to her brothers.

Callum is the eldest son and heir apparent to the Griffin family's criminal and political empire. He campaigns for city alderman and approaches his life with rigid control, treating relationships as strategic transactions. He initially views his arranged marriage to Aida entirely as a political calculation to secure the Italian vote and neutralize a dangerous gang feud.

Enzo is the patriarch of the Italian Gallo mafia family. He grieves the loss of his wife and seeks to protect his family's interests in Chicago. He wields absolute authority over his children, demonstrated when he forces Aida into an arranged marriage to avoid a gang war.

Fergus is the calculating patriarch of the Irish Griffin family. He views his children primarily as strategic instruments to expand his empire's power and influence. He prioritizes pragmatic solutions, initiating the marriage pact to secure political leverage and prevent bloodshed.

Imogen is Callum's mother and the social architect of the Griffin family. She presents a polished exterior as a consummate socialite but operates as a ruthless strategist behind closed doors. She uses her own history in an arranged marriage to pressure Callum and attempts to mold Aida into a suitable political wife.

Dante is the eldest Gallo sibling and the stoic guardian of the family. He shoulders the responsibility of protecting his relatives and managing the family's business operations. He acts protectively toward Aida and frequently tries to curb her chaotic impulses.

Oliver is Aida's former boyfriend. He refuses to accept their breakup and becomes increasingly persistent and erratic in his attempts to insert himself back into her life.

Tymon Zajac, known as the "Butcher of Bogota," leads the rival Polish mafia. He employs overt brutality and aggression, presenting a significant external threat that forces the Griffins and Gallos to coordinate their defenses.

Nero is Aida's second-oldest brother. He eagerly embraces the violent, unrestrained side of his family's criminal enterprise. He enthusiastically participates in Aida's reckless plans and pushes for violent retaliation when the family faces threats.

Sebastian is Aida's youngest brother and her closest confidant. Unlike his older brothers, he attempts to distance himself from the criminal underworld, aspiring to a legitimate career as a professional basketball player.

Riona is Callum's sister. She works diligently for the family business but harbors bitter jealousy over the patriarchal structure that automatically elevates Callum as the heir. She maintains a severe demeanor and frequently directs sharp insults at Aida.

Nessa is the youngest Griffin sibling. She maintains a gentle spirit and lives somewhat detached from her family's brutal reality. She accepts Aida warmly and without judgment, offering a rare source of kindness within the Griffin household.

Jack is a former UFC fighter who serves as Callum's primary enforcer and bodyguard. He acts as the physical extension of Callum's authority, executing brutal orders that escalate the feud between the families.

Henry is Oliver's father. He attempts to leverage his son's physical altercation with Callum into a power play, demanding lucrative real estate as restitution.

Jada is a waitress who knows Aida. She provides information about Tymon Zajac's mistress after Callum bribes her, though she appears uncomfortable with the interrogation.

Francie is Tymon Zajac's mistress. Her routine and home address become strategic intelligence for the newly allied mafia families.

Jeremy is a diver hired by Aida for a specific, private task. His specialized skills assist Aida in an endeavor to recover a lost item.