Dante is a middle-aged Italian poet and political exile from Florence who undertakes a spiritual odyssey through the nine spheres of Heaven. He is inquisitive and intensely curious about theology, history, and the moral order of the universe. Though striving for higher knowledge and spiritual purity, he retains strong earthly attachments and concerns about the political turmoil dividing his homeland.

Beatrice is a Florentine noblewoman who serves as Dante's ideal of womanhood and his primary guide through the heavenly spheres. She symbolizes theology, faith, and divine grace, possessing preternatural knowledge that allows her to read Dante's thoughts and anticipate his questions. As they ascend through the spheres of Heaven, her physical beauty continually increases.

Cacciaguida is Dante's great-great-grandfather and a former crusader who died fighting in the Holy Land. He dwells in the sphere of Mars among the warriors of the faith. He shares nostalgic memories of a simpler, purer Florence while prophesying his descendant's impending political exile.

St. Thomas Aquinas is a renowned medieval theologian who represents Christian wisdom. Dwelling in the fourth heavenly sphere, he serves as an intellectual authority who balances reason and faith. He speaks modestly of his own work, preferring to praise the founders of other religious orders and criticize the current corruption within his own Dominican order.

St. Bernard is a historic monk and mystic who serves as Dante's final guide in the highest reaches of Heaven. He takes on a fatherly role, preparing the poet for the ultimate vision of the divine. His profound devotion to the Virgin Mary makes him the ideal mediator for the poem's concluding moments.

Piccarda is a nun who occupies the lowest rank in Heaven due to an earthly life marked by broken vows. She originally took vows in the order of St. Clare but was forcibly removed from her convent by violent men and made to marry against her will. Despite her placement in the lowest heavenly sphere, she experiences perfect happiness and total alignment with God's will.

St. Peter is the primary apostle of Christ and a central figure in the heavenly hierarchy. He acts as an examiner, testing Dante's theological understanding of faith. He also delivers a scathing denunciation of the corruption present in the modern papacy, demonstrating that heavenly souls still care deeply about the earthly church.

Charles Martel is the former ruler of Hungary and an acquaintance of Dante from his earthly life. He dwells in the sphere of Venus, a sphere associated with those who experienced romantic love but lacked total temperance. He advocates for a well-rounded society that values people of diverse backgrounds and natural talents.

St. Benedict is the historical founder of Western monasticism. Dwelling in the sphere of Saturn among the contemplatives, he recounts his earthly work of bringing the gospel to pagan lands. He expresses deep anger and sorrow over the moral decline and materialism of his contemporary monastic orders.

The Virgin Mary occupies a position of supreme reverence in Heaven, possessing the face that most closely resembles Christ. She represents ideal womanhood and serves as a vital mediator between humanity and God. Her presence prompts overwhelming devotion and joyous music from the surrounding angels and saints.

St. James is an apostle who resides in the high heavenly spheres. Following St. Peter's test on faith, he assumes the role of examiner to question Dante specifically on the virtue of hope. He desires the poet to share the secrets of heavenly hope with people on earth.

St. John is the brother of James and the apostle known as Jesus's closest friend. His spiritual brightness is so intense that it overpowers mortal sight. He conducts the third and final theological examination, questioning the poet on the virtue of love and the targets of human affection.