Alonso Quixano is a 50-year-old minor Spanish nobleman living in La Mancha. Bored with his unremarkable life, he immerses himself in books about chivalry until he decides to live by their ancient codes. Taking the title Don Quixote, he sets out to protect the helpless and defeat evildoers, entirely convinced that windmills are giants and roadside inns are grand castles. His complete dedication to his imagined reality gradually influences everyone around him.

Sancho Panza is a pragmatic, working-class peasant who leaves his family to serve as Quixote's squire. Though initially motivated by the promise of wealth and political power, he develops a genuine, deep loyalty to his eccentric master. He frequently points out the physical reality of their surroundings, such as windmills not being giants, but slowly adopts many of Quixote's eccentric explanations for the world's strange events.

Dulcinea del Toboso is the completely invented, idealized romantic obsession of Don Quixote. Though based on a local peasant woman named Aldonza Lorenzo, the Dulcinea that Quixote champions exists entirely in his mind as a flawless, beautiful princess. She serves as his ultimate motivation, driving him to perform heroic deeds and demand that strangers acknowledge her unmatched beauty.

The Duke is an immensely wealthy and thoroughly bored aristocrat who has read the published accounts of Quixote's early adventures. Rather than help the confused knight, he invites Quixote and Sancho to his castle specifically to play elaborate, humiliating pranks on them. He represents the idle, cruel reality of the modern nobility, completely lacking the honorable traits Quixote attributes to lords.

The Duchess is a wealthy noblewoman who actively directs much of the psychological manipulation inflicted upon Quixote and Sancho. She takes a particular interest in Sancho Panza, finding his peasant proverbs and simple manners highly amusing. She orchestrates complex theatrical events, including fake wizards and floating wooden horses, purely for her own shallow entertainment.

Sanson Carrasco is a young scholar from Quixote's village who takes an active interest in the knight's growing fame. Educated and slightly arrogant, he initially teams up with the village priest and barber to devise a scheme to force Quixote back home. He uses Quixote's own chivalric rules against him, donning armor himself to challenge the older man on his own terms.

Serving as both the author and a distinct narrative voice, Cervantes presents himself as a historian piecing together the true story of Don Quixote. He frequently interrupts the plot to discuss missing manuscript pages, translation issues, and his deep annoyance with unauthorized, counterfeit sequels to his work. He blurs the line between fiction and history by treating his protagonist as a real historical figure.

Pero Perez is the local village priest and a long-time friend of Alonso Quixano. He firmly believes that chivalric romance novels have ruined his friend's mind. Though he acts out of genuine concern for Quixote's safety, he frequently resorts to deception, disguises, and property destruction to force the knight to abandon his fantasies.

Master Nicholas is the village barber and another close friend of the protagonist. He acts as the priest's primary accomplice in the ongoing effort to save Quixote from his delusions. He willingly participates in elaborate theatrical deceptions, including wearing fake beards and assuming false identities, to trick his eccentric friend into returning to their quiet village.

Cardenio is an aristocratic young man who has exiled himself to the harsh mountains following a devastating romantic betrayal. Driven to occasional bouts of violent rage by his heartbreak, he lives as a wild man in the wilderness. His tragic story of lost love deeply moves Quixote, though the two men occasionally come to blows over their differing views on chivalry.

Fernando is a wealthy and powerful young nobleman who uses his social status to take whatever he desires. He routinely seduces and abandons women, including Dorotea, before setting his sights on his friend Cardenio's beloved Luscinda. His arrogant, selfish behavior provides a sharp contrast to Quixote's pure, idealized version of chivalric honor.

Dorotea is a fiercely intelligent and resourceful young woman who was seduced and abandoned by Fernando under false promises of marriage. Refusing to be a passive victim, she sets out in disguise to track him down. She proves highly adaptable, easily playing the role of the fictional Princess Micomicona to help the village priest trick Quixote into returning home.

Quixote's unnamed niece lives in his crumbling country estate and manages his domestic affairs. She is highly distressed by his sudden decision to become a knight errant, blaming his large collection of books for his strange behavior. She strongly advocates for burning the books and wishes her uncle would simply attend the royal court rather than seek danger on the roads.

The unnamed housekeeper maintains Quixote's home and shares his niece's intense dislike of his literature. She is highly superstitious and fully supports the priest's decision to burn the books, carrying out the destruction herself. She frequently tries to physically block Sancho Panza from entering the house, blaming the squire for encouraging her master's behavior.

Luscinda is a young woman of noble birth caught in a complicated romantic struggle. She deeply loves Cardenio but is pressured into an unwanted marriage arrangement with the wealthy and powerful Fernando. Her desperate attempts to avoid this forced marriage set off a chain reaction of tragedy and mistaken identities that echoes throughout the mountains.

Teresa Panza is Sancho's highly practical, working-class wife. She fundamentally distrusts her husband's sudden ambitions to become a governor or an aristocrat, acutely aware of their low social standing. She fears that reaching above their station will only bring disaster upon their family, firmly grounding the narrative in the harsh realities of peasant life.

Altisidora is a maidservant in the Duchess's household who enthusiastically participates in the cruel pranks against Quixote. She pretends to be madly in love with the knight, singing to him and feigning severe heartbreak when he predictably rejects her in favor of Dulcinea. She even goes so far as to fake her own death to further the elaborate joke.

Dona Rodriguez is an older maidservant in the Duke's household who actually believes in Quixote's knightly code. Unlike the rest of the household, she approaches him with a sincere plea for help regarding her seduced and abandoned daughter. Her attempt to secure real justice inadvertently exposes the shallow, uncaring nature of the Duke and Duchess.

Gines de Pasamonte is a notorious, unrepentant criminal whom Quixote frees from a chain gang under the mistaken belief that knights must liberate the oppressed. Rather than showing gratitude, Gines immediately attacks Quixote and later steals Sancho's donkey. He later reappears in disguise as Master Pedro, running a traveling puppet show with a supposedly magical ape.

The innkeeper is a practical businessman who runs the establishment Quixote mistakes for a castle. Realizing his guest is detached from reality, he decides to play along for his own amusement, formally knighting Quixote in a completely invalid, mock ceremony. He regularly deals with the chaotic fallout of Quixote's delusions, usually by demanding payment for broken property.

Maritornes is a hardworking maid at the inn who becomes accidentally entangled in Quixote's delusions. While sneaking into a dark room to visit a mule herder, she is intercepted by Quixote, who believes she is a beautiful princess trying to seduce him. This misunderstanding sparks a massive, violent brawl in the dark that leaves multiple people injured.

Cide Hamete Benengeli is the fictional Moorish historian credited with writing the original manuscript of Don Quixote's adventures. Cervantes claims to merely be translating Benengeli's work, though the narrator frequently questions the historian's reliability, playing on the period's prejudices against Moorish authors to cast doubt on specific events in the narrative.

Dapple is Sancho Panza's exceptionally loyal and sturdy donkey. The animal serves as Sancho's primary mode of transport and his most prized material possession. When Dapple is temporarily stolen in the mountains, Sancho falls into a deep depression, highlighting the profound emotional connection between the peasant and his beast of burden.

Rocinante is Don Quixote's elderly, frail, and overworked horse. Despite lacking the strength or speed of a true warhorse, Quixote views him as the greatest steed in the world. Rocinante frequently suffers alongside his master, being beaten, trampled, and starved as a direct result of Quixote's endless search for dangerous adventures.