Aston Nietzsche

Aston Nietzsche is the Sword Saint, a cardinal, and Selena's lifelong protector. His body contains a second soul, the ancient Sword Saint Izza, making him both the strongest champion of his era and a living problem for conventional ideas about identity. Aston's relationship with Vanitas Astrea develops from instinctive suspicion into reluctant respect and moral opposition: he helps legitimize Vanitas when the evidence warrants it, yet his rigid righteousness also makes him a future obstacle Vanitas decides to remove. (Chapters 56, 110, 135, 195–207, and 250)

Biography

Sword Saint and Second Soul

Aston is an ordinary child until villagers interpret the presence inside him as demonic. His first stigmata appears unremarkable, but a kindred spirit gradually enters him and eventually takes control when the village sentences him to burn. The resulting power lets him escape and makes him the first recorded case of Stigmata Identity Disorder: two souls and two stigmata occupying one body. The second soul is Izza, a Sword Saint from the Dawn of War, whose different age, temperament, and memories explain why Aston can seem disciplined on one day and startlingly childlike or coarse on another. (Chapter 56)

The Church turns the surviving boy into its champion. Aston swears himself as Selena's sword when she is still an orphaned village girl, long before either holds a world-famous title, and grows into her personal protector and a cardinal. He treats guardianship as more than pageantry: he notices her distress behind public composure, holds her hand through visions, and repeatedly places her safety above diplomatic convenience. At the same time, the youthful vow binds him to rules he did not understand, so the relationship that gives his life purpose also creates the mechanism by which the Church can control him. (Chapters 110, 189, 207, 218, and 250)

At Selena's inauguration, Aston senses Vanitas's anomalous soul across a crowded hall and later confronts him in private. Izza is excited to meet “someone like us,” while Aston tightens his handshake and tests whether Vanitas recognizes the similarity. He introduces himself modestly as only the Saintess's bodyguard, but neither his suspicion nor his immense pressure is concealed. The meeting establishes Vanitas as an identity mirror—another man whose soul does not fit ordinary expectations—and begins a rivalry driven by judgment rather than simple hostility. (Chapters 132–135)

Judging Vanitas

Aston's pursuit of the Ripper reveals the moral rule behind his authority. He recognizes that the victims are corrupt and that the killings may produce outcomes some would call just, but rejects secret execution as a solution and investigates anyway. When Selena's visions repeatedly resist prevention, he does not promise that the world itself can be saved; instead, he promises to save what he can. That outlook makes him a counterweight to Vanitas, whose willingness to kill, deceive, and manipulate systems accepts costs Aston still believes a righteous protector should refuse. (Chapters 144 and 146)

Selena's vision of Margaret draws Aston into Aetherion. He uses clerical connections to identify her and insists on traveling alone because Selena's unannounced presence would cause a political crisis and she lacks his combat strength. In an alternate reality, his counterpart demonstrates the seriousness beneath that restraint by killing Margaret once she turns her sword against the world. In the present, Aston crosses the channel covertly, cannot fully suppress the aura leaking from his power, and joins Soliette in destroying Axenburg's chimeras. Seeing Vanitas's soldiers remain loyal rather than blame their absent lord complicates Aston's assumption that he is merely a suspicious noble favored by Selena. (Chapters 189–196)

The Great Powers' hearing turns that revised impression into a consequential judgment. Aston notices that the Church has supplied him fragments without context, identifies Vanitas as a possible scapegoat, and demands proof of the clergy's heresy before allowing punishment to continue. He uses holy magic at Vanitas's direction to verify the cathedral's hidden points, but still challenges the demonic language and spirit surrounding him. Their wager is deliberately conditional: if Vanitas survives the Great Powers' attacks, Aston will accept the apparent trap. Vanitas succeeds, and Aston's support helps establish him as a Great Power without requiring Aston to trust his motives. (Chapters 203–204)

Aston then chooses faith over obedience. When Pope Telos accuses him of betrayal, Aston calls Vanitas a dangerous sword cutting enemies the Church can no longer face and argues that loyalty does not require blindness. The Pope activates the divine seal and collapses him, proving that Aston's body remains institutionally shackled even after his conscience breaks with its leadership. Aston nevertheless plans to leave the Theocracy with Selena and evacuate her orphanage. When cultists attack, he lets Izza assume control despite the humiliation and pain because the ancient soul is stronger and Selena needs time to escape. His independent judgment thus saves lives, but also exposes exactly how the oath can be weaponized against both souls. (Chapters 207, 210, 212, and 213)

Captivity, Rivalry, and Ruination

The failed escape removes Aston and Selena from public view. The false Pope holds Aston for roughly a month and triggers the seal through his staff, burning pain directly through Aston's soul without leaving the external wounds expected from ordinary torture. Aston understands from Izza that Telos's soul has already been erased, and the loss of a man he once regarded as a father compounds the agony. He responds by provoking his captors and refusing them the surrender of death, preserving his defiance even while the office and relationship that shaped him have both been corrupted. (Chapters 214, 225, and 234)

When the rescue force reaches his cell, Aston's first effective action is recognition rather than combat. Exhausted and chained, he hears Selena approach but rejects the figure violently, insisting that he knows Selena's voice, heart, and mana signature and that the person before him is not her. His intimacy gives him the clarity the rescuers lack: Fyodor has already infiltrated her identity. Soliette frees his restraints, yet rescue cannot restore the Saintess he swore to protect, and Aston enters the confrontation knowing that her familiar body has become the enemy's most effective disguise. (Chapters 247–248)

Aston attempts to strike Fyodor, but his renowned blade shatters on contact and the oath completes the ruin that imprisonment began. The youthful vow does not merely compel obedience to the Pope; it prevents Aston's blade, strength, and even will from harming anything tied to the clergy. Because Fyodor occupies Selena—the holiest person Aston is sworn to guard—Aston cannot lift a hand against the vessel even while it threatens the world. His strength remains physically overwhelming, but it has become unusable at the one moment that defines his purpose, leaving him convinced that he has failed Selena. (Chapter 250)

The Final Struggle

Vanitas deliberately attacks Aston at the point of that despair. He blames him for Selena's loss, kicks a sword to his feet, and tells him to kill himself. Aston protests that Vanitas cannot understand what she meant to him, but the accusation converts guardianship from the source of his identity into proof, in his mind, that he no longer deserves one. Although Izza recognizes the provocation and begs him not to act, Aston takes up the sword. The following impact and Vanitas's declaration that he is dead establish Aston's suicide rather than a renewed attempt to join the battle. (Chapter 250)

His absence from the struggle against Araxys is therefore a consequence of both the Church's oath and Vanitas's strategic cruelty. Vanitas believes Aston's righteousness and overwhelming power would eventually oppose the world he intends to build, so he removes a potential future enemy when grief makes resistance possible. Later confirmation that the Sword Saint's blessings pass on at death, and that they have reached Kafka Rossweisse, closes any uncertainty about Aston's fate. Aston never receives a final reconciliation with Selena or Izza; the office survives him, but the protector who challenged both Vanitas and his own Church does not. (Chapters 250 and 290)

Appearance and personality

Aston is shown with deep ocean-blue eyes and commonly wears white clerical robes lined with gold. During Izza's control, his eyes shift to a bright gold or orange glow and the pressure around his body changes sharply enough to announce the second presence. While imprisoned, his chest is bare and his skin has no visible wounds despite the profound exhaustion and spiritual torture he has endured. The corpus does not provide a stable hair color or a fuller recurring description, so those details remain unspecified. (Chapters 135, 144, 213, and 247)

He is normally calm, professional, and more modest than his reputation as the strongest suggests, often calling himself simply Selena's bodyguard. His restraint includes a preference for capturing targets alive and a refusal to accept murder merely because the victims are corrupt. Izza's influence can make the same face and voice crude, childlike, or openly violent, which contributes to Aston's reputation for unpredictability without making every mood change a full possession. Aston's defining virtues—loyalty, righteousness, and refusal to ignore institutional evil—also become vulnerabilities when a binding oath turns loyalty into compulsion and failure into unbearable shame. (Chapters 56, 135, 144, 192, 207, and 250)

Magic and abilities

Aston is a Sword Saint and Great Power whose abilities combine exceptional swordsmanship, immense physical and divine output, heightened perception, and the unusual presence of Izza. He is already regarded as the strongest of his era when he enters the story; the corpus records no formal rank advancement or qualifying persistent power-state change for him. His greatest limitation is not lack of force, but a divine oath designed to govern when and against whom that force can be used. (Chapters 56, 119, 192, 195, 213, and 250)

Stigmata Identity Disorder and Izza

Stigmata are described as expressions of the soul, normally one per person. Aston's case violates that rule because Izza's kindred spirit enters him with a second soul and a second stigmata, creating the first recognized Stigmata Identity Disorder. Control can pass between them: Aston closes his eyes and yields, his irises change color, and Izza speaks and moves through the same body while Aston remains able to warn him internally. The arrangement also makes ordinary possession infeasible because another resident soul already occupies the vessel. The source does not name either stigmata or define a fixed duration for control. (Chapters 56, 119, 135, and 213)

Izza is substantially stronger in direct combat because he was raised during the Dawn of War rather than an age of diplomacy. Under his control, the body continues fighting while the divine seal burns through it, abandons a sword that has become dead weight, moves faster than paladins can track, channels divine force through punches, and tears through attackers despite escalating restriction. This is not a permanent increase in Aston's own mastery: the two souls retain separate voices and experience, and Izza's greater tolerance does not cancel the seal's pain, prevent injury, or guarantee victory before the body fails. (Chapter 213)

Swordsmanship and physical power

Aston's ordinary strength is sufficient to place him at the summit of living swordsmen. He generally captures opponents alive because serious force is unnecessary, but an alternate-reality confrontation with Margaret shows that he can meet her escalating strikes and kill with a single clean thrust once restraint is no longer viable. In the present, his excess energy leaks despite efforts to suppress it, and he and Soliette each destroy large numbers of chimeras at Axenburg. These demonstrations establish overwhelming speed, pressure, and weapon skill, but not invulnerability: Fyodor breaks Aston's famed blade on contact and throws him aside. (Chapters 192, 195–196, and 250)

Holy magic and perception

Aston can channel holy or divine energy independently of ordinary sword strikes. At Vanitas's request, he applies it to the cathedral's hidden points during the verification of Church heresy, while Izza later releases divine energy through the body strongly enough to shatter the surrounding battlefield. Aston also perceives abnormalities other people miss: he notices Vanitas's unusual soul across a crowded hall, cannot fully hide the pressure of his own energy, and recognizes Fyodor inside Selena through discrepancies in voice, heart, and mana signature. These are demonstrated sensitivities rather than unrestricted soul reading; he still needs context and Izza's judgment to identify the false Pope's replaced soul. (Chapters 132–135, 195, 204, 213, and 247)

Oath of Lumine and divine seal

The oath Aston accepts in youth binds his soul to the Church's authority. The Pope can activate its divine seal with his staff, producing spasms, burning through Aston's veins, degrading his senses, and directly torturing both him and Izza without necessarily marking the skin. More decisively, the vow restricts blade, strength, and will from harming anything associated with the clergy. Izza can push through some of the pain to fight attackers, but neither soul can nullify the underlying terms; the seal slows even Izza and makes Aston incapable of attacking Fyodor while he uses Selena's consecrated body. (Chapters 207, 213, 234, and 250)

The constraint is relational and juridical rather than a simple drain on raw power. Aston can destroy chimeras, fight secular targets, and challenge Church policy, yet the vow activates when the protected institution and Saintess become the objects of force. This mismatch allows a corrupted clergy to use sacred status as armor against its own champion. By the latest state, Aston has no opportunity to break or renegotiate the oath: he dies while it is still binding, and the Sword Saint's blessings transfer to a successor. The text does not establish that Izza survives independently after the body's death. (Chapters 196–207, 250, and 290)

Relationships

• Selena: Aston swears to be Selena's sword while she is still an orphan and becomes her protector, confidant, and practical link to the outside world. He helps her leave the corrupted Theocracy and recognizes Fyodor within her body before the rescuers do, but the oath prevents him from striking the vessel; believing he has failed her destroys the purpose around which he built his life. (Chapters 110, 146, 189–190, 207–218, 247, and 250)
• Vanitas Astrea: Aston first treats Vanitas as a suspicious soul and possible threat to Selena, then observes the loyalty he inspires, demands evidence before condemning him, and helps confirm both Church heresy and Vanitas's standing as a Great Power. Their reluctant respect never erases moral opposition: Vanitas finally exploits Aston's grief because he expects the righteous Sword Saint to obstruct his future plans. (Chapters 132–135, 195–207, and 250)
• Izza: Izza is the ancient Sword Saint whose soul and stigmata share Aston's body. He mocks and challenges Aston but takes control when greater strength is needed, continues fighting through the seal, and begs Aston not to answer Vanitas's final provocation. Their relationship is an uneasy partnership between distinct identities rather than one personality with changing moods. (Chapters 56, 119, 135, 213, and 250)
• Soliette Dominique: Aston and Soliette are peers repeatedly compared as the world's strongest. They jointly relieve Axenburg and fight in the Theocracy assault, though Aston accepts Soliette's judgment when she says the Abyss manifestation lies outside his expertise. (Chapters 195–197 and 245–250)
• Fyodor Dragunov: Fyodor's network corrupts the authority encoded in Aston's oath, imprisons and spiritually tortures him, and ultimately occupies Selena's body. That combination defeats Aston without needing to overpower all of his physical strength: the target he most needs to strike is the one his vow makes untouchable. (Chapters 213, 234, 247–250)

Items

• No notable item associated with Aston meets the scoped item-manifest criteria.