This character originates from Miguel de Cervantes' novel *Don Quixote*, adapted into an anime series. He is an aging nobleman from La Mancha whose obsessive reading of chivalric romances drives him to a mental break, compelling him to adopt the persona of a knight-errant. He renames himself Don Quixote de la Mancha, designates his old horse as Rocinante, and idealizes a peasant woman, Aldonza Lorenzo, as his exalted lady love, Dulcinea del Toboso. She remains entirely unaware of his devotion and never physically appears.

His core mission is to revive knight-errantry and combat perceived injustices. This quest manifests through delusional reinterpretations of reality: windmills become giants he must battle, roadside inns transform into castles, and commoners are seen as enchanted nobles or foes requiring defeat. He persists in this unwavering commitment to chivalric ideals despite repeated physical confrontations, mockery, and practical failures, underscoring the chasm between his fantasies and the tangible world.

He recruits Sancho Panza, a pragmatic peasant laborer, as his squire by promising him governance of an island. Their dynamic forms the narrative's core, with Sancho’s earthy pragism contrasting his master’s lofty delusions. Sancho frequently attempts to dissuade or protect him from the consequences of his actions, though he occasionally enables the delusions—such as fabricating a tale about Dulcinea being enchanted when unable to locate her. This lie reinforces his belief in magical forces opposing his quest.

Key episodes involve figures who manipulate his madness for amusement, like a duke and duchess who stage elaborate pranks. These deceptions include fabricated quests and false enchantments, deepening his resolve while exposing him to humiliation. Despite fleeting moments of clarity or exhaustion, he consistently recommits to his knightly identity, interpreting setbacks as trials orchestrated by malevolent enchanters.

His relationship with Dulcinea remains abstract and symbolic, representing unattainable perfection that fuels his actions. He performs deeds of valor in her name, retreating to the wilderness for penance and sending Sancho with messages she never receives. Her absence underscores the self-constructed nature of his entire mission.

The narrative concludes with his eventual return home following a final defeat. This leads to his renunciation of the knightly persona and a return to sanity as Alonso Quijano, culminating in his death and the end of his idealized world.