Celene Castia is the secondary unreliable narrator, providing a narrative that both complements and complicates her brother’s. In the present-day frame narrative within Sul Adair, Celene presents herself as a cold, zealous follower of the Esani faith, maintaining a convincing performance of animosity toward Gabriel. This fabricated persona is important to their shared ruse, as she provides Jean-François with the supposed motivations behind the Esani’s actions and Gabriel’s “betrayal.” Her willingness to portray herself as a fanatic who broke Ashdrinker and drove her brother to Voss’s side demonstrates her strategic thinking and deep-seated loyalty to their true cause.

In the past timeline, Celene’s journey is one of indoctrination, disillusionment, and eventual rebellion. Murdered and turned by Laure Voss, she seeks out her half-brother’s sire, Wulfric, who mentors her in the ways of the Esani. Initially, she embraces their faith, viewing the act of “communion”—cannibalizing other vampires—as a holy sacrament and a path to salvation from her vampiric curse. Her relationship with the mortal Laurent Durand shows a connection to the humanity she has lost, a bond she ultimately sacrifices for her perceived duty. Celene’s character is defined by this internal conflict between her faith and her lingering moral compass. This conflict culminates in her discovery of the Esani’s apocalyptic true purpose: to end the world. Her decision to betray her prioress, Maryn, and side with Dior and Gabriel marks her as a dynamic character, choosing to save the world at the cost of her own soul’s redemption.

Celene’s identity is deeply intertwined with the souls she carries within her, a consequence of the Esani communion. These internal voices, especially that of her former mentor Wulfric, create a constant psychological turmoil that threatens her sanity and control. This inner chaos makes her a volatile figure, whose actions are often a result of wrestling with these conflicting wills. Her relationship with Gabriel is the narrative’s most complex, shifting from distrust and betrayal to a grudging alliance and, finally, a shared fight for a common cause. Despite their history, their bond as “Always Lions” (84) proves to be the one constant in their tumultuous lives.

Dior is the central figure of the narrative’s past timeline, embodying the messianic archetype of the Chosen One. Her journey is a transformation from a pragmatic, orphaned street thief into a reluctant, then resolute, leader. The discovery that her blood can heal the sick and burn vampires marks the beginning of her divine calling, identifying her as the descendant of the Redeemer and the prophesied Holy Grail. Dior’s character is defined by a deep-seated compassion, which motivates her to repeatedly use her own blood to heal her followers, even at great personal cost. This selflessness is a core aspect of her character, driving her to make immense personal sacrifices for the greater good.

Despite her holy lineage, Dior remains grounded and pragmatic, often expressing cynical disbelief in the face of the prophecies surrounding her. This internal tension between her humble origins and her grand destiny makes her a relatable and complex figure. Her relationships are important to her development. She views Gabriel as a protective father figure, while her romantic bond with Reyne á Maergenn provides emotional support and motivates some of her most significant sacrifices, such as agreeing to a political marriage to Prince Philippe. The later revelation of her duskdancer heritage adds another layer to her identity, connecting her not only to a divine lineage but also to the primal, magikal world of the Highlands.

Dior is a dynamic and round character because she grows into her power, both politically and supernaturally. She learns to wield her blood not just as a tool for healing but as a weapon, a form of sanguimancy she uses to destroy the ancient vampire Maryn. Her growth as a leader is evident in her ability to inspire loyalty in her followers, the Unbound, and to make difficult strategic decisions, such as using Augustin’s canals to create a holy steam to destroy the Endless Legion.

As the primary antagonist of the frame narrative, the Marquis Jean-François serves as the jailer and historian tasked by Empress Margot with extracting Gabriel de León’s story. Jean-François is characterized by his vanity, intellectual arrogance, and hedonistic pursuits, which make him a perfect and susceptible audience for the elaborate tale woven by Gabriel and Celene. Jean-François’s role is that of a gatekeeper to the truth, yet his own biases and desires blind him to the grand deception being played out. His analytical mind is consistently undermined by his fascination with Gabriel’s legend and his prurient interest in the more salacious details of the story, vulnerabilities that the siblings expertly exploit to stall for time.

Jean-François’s relationship with his mother, Empress Margot, is central to his motivation. He is desperate for her approval, a desire that drives his mission to uncover the secrets of the Grail. This sycophantic loyalty, however, is tinged with fear, as he is aware of the consequences of failure. This dynamic positions him as a figure of significant power who is nonetheless powerless against the whims of his sire. His ultimate downfall is a product of his own hubris; he believes he is in control of the narration and his prisoners, only to discover he has been a pawn in their game all along. His final, pathetic fate—trapped for eternity in a lightless cell—is a direct consequence of underestimating the “worms” he was charged with interrogating.

Fabián Voss is the primary antagonist of the main narrative, a figure of immense power and ancient evil. As the Priori of Blood Voss and commander of the Endless Legion, he represents a seemingly unstoppable force of conquest. However, his motivations are revealed to be more complex than simple tyranny. Having lived for a millennium, Voss suffers from ennui; his war is not for empire but for entertainment, a game to alleviate his boredom. His obsession with Gabriel de León stems from this desire, as he sees in the silversaint a worthy adversary who can make him “taste life through fear” (395). 

The revelation that Voss is one of the five priests who murdered the Redeemer and the architect of “daysdeath” cements his status as the story’s central evil. His quest to capture Dior is driven by a desire to use her holy blood to grant the vampiric gift at will, a power that would allow him to create an army of highbloods and secure his reign forever. This ambition emphasizes the theme of The Corrupting Nature of Absolute Power, as his pursuit of ultimate control leads him to sacrifice his own children and risk his entire empire. Voss’s eventual defeat at Gabriel’s hands is not just a military victory but a symbolic triumph over a nihilistic and world-destroying evil.

As the ancient Priori of the Esani, Maryn embodies the dangers of religious fanaticism, illustrating the theme of The Perils of Uncritical Faith. Trapped in the body of a child but possessing the knowledge and power of eight centuries, Maryn’s appearance is a stark and unsettling contrast to her true nature. She is a master sanguimancer and manipulator, who deceives Dior and her followers into believing the Esani prophecy is a path to ending “daysdeath.” In reality, her goal is apocalyptic: to trigger the Day of Judgment as a “loophole” to escape vampiric damnation, willing to sacrifice the world for the salvation of her cult. This reveals her character as utterly ruthless and self-serving, viewing all mortals as expendable for her holy cause. Maryn’s power is immense, capable of destroying hundreds of soldiers with a thought, but her greatest weapon is deception, twisting faith into a tool for annihilation. Her death at the hands of Dior and Gabriel represents the rejection of this fanatical, self-destructive ideology.

The relationship between Aaron and Baptiste is a powerful representation of Love as an Act of Rebellion. Their bond endures excommunication, exile, and even Aaron’s transformation into a vampire. Aaron, a paleblooded son of Ilon turned highblooded Dyvok, is a character in constant turmoil. His primary struggle is to retain his humanity and his love for Baptiste in the face of his vampiric thirst and the traumatic memories of his thralldom under Nikita. He refuses to drink from Baptiste, fearing he will lose control and harm him, a choice that causes pain to them both but emphasizes the depth of Aaron’s devotion. Baptiste, a genius blacksmith, remains steadfastly loyal. His journey is one of coming to terms with his lover’s new nature, even tempting him with his own blood in a desperate attempt to bridge the gap between them. Together, they represent hope in a world designed to tear such bonds apart.

Phoebe á Dunnsair, a duskdancer capable of shifting into a lioness, is a fierce warrior whose loyalty is tested throughout the narrative. Introduced as Gabriel’s lover in the past timeline, she forms a deep bond with him through their shared experiences of loss. Her relationship with Gabriel is passionate but fraught, complicated by his unresolved grief for his wife. Phoebe’s most significant role, however, is as a double agent in the final act. Thralled by Maryn, she is forced to betray Gabriel and Dior by stealing Ashdrinker and delivering a false narrative of Gabriel’s defeat. Yet, even under Maryn’s control, her love for Dior and her loyalty to Gabriel lead her to resist, ultimately playing a key part in the heroes’ final gambit at Sul Adair.

Reyne á Maergenn, the “illegitimate” daughter of Niamh Nineswords, develops from a background player into a key figure through her relationship with Dior. Raised in the Elidaeni court, she possesses a political shrewdness that Dior lacks, making her a fitting counselor and strategist. Reyne’s love for Dior is her primary motivation, leading her to make the ultimate personal sacrifice by proposing Dior’s marriage to Prince Philippe. This act, which secures Dior’s political standing at the cost of their own happiness, is a defining moment for Reyne’s character, showing her selfless devotion and keen understanding of courtly power dynamics.