Imogen is the loyal princess of Britain and Cymbeline's daughter. She is fiercely devoted to her husband, Posthumus, and willingly faces her father's wrath and imprisonment rather than abandon her marriage. She speaks her mind directly and firmly resists the unwanted, aggressive advances of her stepbrother Cloten. Her purity and honor make her a target for those seeking to prove human nature is inherently corrupt.

Posthumus is a gentleman of the British court who, despite lacking royal blood, is renowned for his inherent nobility and inner worth. Having lost his warrior family in infancy, he was raised in Cymbeline's court and fell in love with the princess. After secretly marrying Imogen, he is banished to Rome, where his pride and absolute faith in his wife are quickly put to a dangerous test.

Iachimo is a cunning Italian gentleman who encounters Posthumus in Rome. Driven by deep cynicism and a desire to prove that no woman is truly chaste, he challenges Posthumus to a destructive wager. He relies on deceit, observation, and psychological manipulation to achieve his goals, viewing personal honor as an exploitable weakness rather than a moral absolute.

Cymbeline is the King of Britain. Though he commands respect and oversees a powerful realm, his judgment is heavily clouded by the influence of his wicked second wife, the Queen. His anger over Imogen's marriage and the long-ago loss of his infant sons leaves him isolated, making him increasingly vulnerable to bad counsel and political instability.

The Queen is Cymbeline's second wife and the mother of Cloten. She is a highly intelligent, Machiavellian figure who feigns sympathy and maternal care while secretly plotting to consolidate absolute power. She harbors a deep hatred for Imogen and actively seeks deadly chemicals to eliminate anyone who threatens her control over the throne.

Cloten is the Queen's son from a previous marriage and Cymbeline's stepson. He is an arrogant and deeply foolish man who believes his royal connections excuse his terrible behavior. He feels completely entitled to marry Imogen and reacts with crude, violent rage whenever he is rejected or outsmarted.

Pisanio is Posthumus's fiercely loyal servant. Left behind in Britain to attend to Imogen, he finds himself caught between his duty to his exiled master, his moral obligations to the princess, and the dangerous machinations of the Queen. He strives to act honorably in a court heavily polluted by deception.

Caius Lucius is a Roman general and ambassador representing the Empire. He is a dignified, noble figure who maintains a personal respect for Cymbeline even when their political interests inevitably clash over Britain's refusal to pay its required financial tribute to Caesar.

Guiderius and Arviragus are two young men living a rustic, isolated life in the Welsh mountains alongside the older man they believe to be their father, Belarius. Despite their wild surroundings and simple clothing, they exhibit an innate nobility and a fierce desire to prove their worth in the wider, dangerous world.

Belarius is an older, battle-hardened man living in exile in the wilderness of Wales. Once a favored and highly loyal warrior in Cymbeline's court, he was unjustly banished due to the lies of corrupt courtiers. He now raises two young men in the mountains, harboring a deep mistrust of courtly life and avoiding detection.

Cornelius is a physician in King Cymbeline's court. Recognizing the Queen's true, malicious nature, he quietly defies her orders. He uses his medical expertise to provide her with a harmless sleeping draught instead of the lethal poison she requests, subtly working to prevent a tragedy.

Philario is a Roman gentleman and an old family friend of Posthumus's late father. He provides Posthumus with a place to stay during his exile and attempts to de-escalate the heated, dangerous argument between his guest and Iachimo.

The First Lord is a sycophantic courtier in Cymbeline's court who frequently accompanies Cloten. He feeds Cloten's massive ego by constantly flattering him and falsely praising his physical prowess, representing the ingrained dishonesty of the royal court.

The Second Lord is a courtier who spends time with Cloten but privately despises him. He frequently provides sarcastic, whispered commentary on Cloten's sheer foolishness and secretly sympathizes with Imogen's difficult situation.