Saigō

Biodata

Feature	Information
Name	Saigō (西乡)
Alias(es)	Zarathustra; Supreme Sovereign; Demon King; Lord of Liyue; Takama-ga-hara Great God
Species/Race	Human Original Text candidate; bearer of the Great Demon Spirits
Gender	Male
Affiliation	Zoroastrianism; Great Tomb of Nazarick; Liyue; Seirai Island; Zoroastrian Sacred Kingdom
Occupation/Role	Sect Master of Zoroastrianism; ruler and patron of multiple nations; former Supreme Sovereign of the Great Tomb
Status	Active; First Rank being 641
First Appearance	Chapter 1

Power Progression

Stage / Realm / Level	Chapter	Notes
Decaying Great Demon	17, 20	His initial power stems from the Third Star Particle in his blood and the Spirit of the Mother of Evil Gods. His Decay can drain life, age targets, and nullify what it touches.
Controller of the Primordial	35	Absorbs the power of the Primordial and begins pursuing the remaining Prime Bodies of the Fourth True Ancestor.
Complete Fourth True Ancestor Familiar set	78	Obtains the Night Lord of Blazing Light’s complete power. Aurora and her eleven sisters become the unified Super-tier Magic Forbidden Twelvefold Existence.
Third Rank Great Demon Spirits	197	Manifests Malice and Decay at their restored Third Rank strength; Weakness and Chaos remain Fourth Rank at this point.
Restored Chaos Spirit	357	After millennia spent repairing his Spirits, Chaos returns to its original power; Treason approaches restoration.
Destruction Spirit	438, 439	Obtains the Destruction Spirit, a newly entered Fourth Rank Spirit defined by pure destructive force.
Second Rank	515	Expels the Six Great Spirits, merges with the Human Original Text, and assimilates the Spirit of the Mother of Evil Gods, becoming a “perfect human” with Second Rank power.
First Rank	641	Enters the river of Human History, understands his true identity and the relationship between humanity, good, evil, and karma, then becomes the only First Rank since ancient times.

Background

Saigō was the first of three Human Original Text candidates and the elder brother of Sakamaki Izayoi and Saigō Homura. He was originally intended to die during the Third Star Particle experiment, but the Mother of Good Gods and the Mother of Evil Gods altered his fate at the cost of their Spirits. Their implanted knowledge and future memories made him believe he was a transmigrator from another world. 572 610 641

His initial strength came not from cultivation, but from the Third Star Particle and the Mother of Evil Gods’ Spirit. Saigō regarded this inherited power as unstable because it had not been earned or fully understood, motivating him to study, fight, and gradually make his abilities his own. 17 78 114

During his early travels, he formed a contract with Nangong Nayue and intervened in the conflict surrounding String God Island. He later acquired the Fourth True Ancestor’s Familiar Beasts, expanding the destructive range that his one-on-one Decay ability initially lacked. 20 21 78

Saigō ultimately learned that he was neither solely a servant of evil nor a transmigrator. By reconciling his humanity with the powers of the Mothers of Good and Evil, he became the founder and doctrine of his own Zoroastrian path. 515 536 641

Appearance

Saigō generally presents himself as a composed, handsome human man, though his appearance can change alongside his existence and power. His true demonic manifestations are associated with black flames, immense size, and draconic traits. 61 186 458

• His human guise can dissolve into black flames. 17 41
• His true demonic form is a giant hundreds of meters tall and engulfed in black fire. 61
• In Little Garden, he can manifest a colossal three-headed dragon before returning to a humanoid combat form. 186 214
• He is frequently depicted in black or dark formal clothing, including a black robe with gold trim as Demon King. 186
• As a Third Rank being, he can alter his existence so others cannot recognize his original appearance. 458

Personality

Saigō is calculating, patient, and acutely aware of power dynamics. He prefers plans with clear objectives and tends to treat promises, contracts, and favors as tools for shaping others’ choices. He is capable of political maneuvering, strategic restraint, and long-term planning rather than pursuing authority for its own sake. 40 64 201

His methods are often cruel, coercive, or manipulative, particularly toward enemies and captives. However, he distinguishes between those he sees as malicious and ordinary people suffering through no fault of their own. He refuses to deliberately prey upon innocent, kind people merely for pleasure, considering this boundary proof that he remains human. 103 277 280

Saigō’s central personal struggle is balancing good and evil. The Mother of Evil Gods initially pushed his thoughts toward extreme malice, while the Mother of Good Gods restored clarity, empathy, and a more human emotional range. He eventually rejects obedience to either extreme, believing that both absolute goodness and absolute evil lead to ruin. 278 515 536

Abilities & Skills

Decay

Saigō’s defining Great Demon power causes aging, exhaustion, deterioration, and death. It affects not only living targets, but also matter, energy, magic, and concepts touched by him. 20 42 43

• Drains stamina and life force; he can restrain its effect rather than immediately killing a target. 20
• Rapidly ages living beings into death if used without restraint. 20 60
• Causes weapons to rust and magic to dissipate on contact. 43
• Nullifies phenomena such as lightning, flames, rain, and Familiar Beast attacks. 42
• Initially excels in single combat but lacks the broad destructive range of large-scale calamity powers. 21

Fourth True Ancestor Familiar Beasts

After obtaining the Night Lord of Blazing Light’s Prime Bodies, Saigō gains command of Aurora and eleven other Familiar Beasts. Under the World Tree system, they exist as a single skill: Forbidden Twelvefold Existence. 69 78

• Provides large-scale destructive power that compensates for Decay’s close-range focus. 21 78
• Can manifest as twelve enormous bone wings from Saigō’s body. 78
• Includes powerful Familiar Beast-derived Super-tier Magic, such as Divine Sheep Diamond. 69 112
• Allows Saigō to deploy calamity-scale attacks against True Ancestors and other high-level opponents. 83

Avesta

Avesta is Saigō’s Divine Group Worldview and one of his greatest defensive and conceptual abilities. Its first three thousand years create a void separating good from evil. 197

• Good-aligned attacks cannot harm him while the void remains active. 197 214
• Its second three thousand years can reproduce the worldviews of other divine groups. 197
• Can summon and support his Great Demon Spirit avatars in battle. 197
• The void’s known countermeasure is a Human Worldview. 197

Great Demon Spirits

Saigō possesses six Great Demon Spirits: Decay, Malice, Weakness, Chaos, Treason, and Destruction. He can manifest them as separate avatars while remaining their central wielder. 197 515

• Malice and Decay reached Third Rank before his other Spirits. 197
• Chaos was restored after prolonged repair during his time in Britain. 357
• Treason can force powers, contracts, or abilities to turn against their users. 295 330
• Destruction is pure annihilating force, capable of tearing apart even an interdimensional rift. 438
• To avoid becoming enslaved by evil, Saigō later distributes Spirits to selected retainers rather than retaining every Spirit within himself. 436 515

Holy Annihilation

Saigō independently researches and learns Holy Annihilation, considering it more truly his own than powers he merely inherited. 114

• Operates on a level comparable to World Item effects and the Omnipotence Domain. 114
• Draws upon cosmic and “Heavenly Principles”-level mysteries rather than ordinary magic. 42 114
• Can convert supreme goodness into supreme evil through Avesta-based manipulation. 138

Martial Arts and Swordsmanship

Saigō inherited extensive combat experience from ancient demons, then refined it through practical combat and long-term sparring. 41 154

• Learns rapidly from opponents, turning inherited knowledge into personal skill. 154
• Developed swordsmanship from novice-level execution into a style capable of pressuring Raiden Ei. 154
• Reached the extreme of human martial capability through decades of sparring with Ei. 174
• Combines technical combat skill with the physical power and resilience of a Great Demon. 190 197

Human Original Text

As the eldest Human Original Text candidate, Saigō possesses an exceptional connection to human history and the balance between humanity, good, and evil. 572 641

• Merged with the Human Original Text to maintain a human will while bearing immense divine power. 515
• Entered the long river of Human History and experienced humanity’s collective epic. 641
• Reached First Rank through his understanding of karma, good, evil, and human history. 641
• Can later draw past beings into the present through the river of history. 643

Equipment / Weapons / Items

• Sword of Watatsumi Great God — A sword created from Aurobas’ sacrificed body; Saigō named it and gifted it to Sangonomiya as Seirai Island’s protector. 154 165
• Ama-no-Murakumo-no-Tsurugi — Borrowed from the Halloween Queen to rebuild the Takamagahara Pantheon and grant Divine Sparks to youkai. 255
• Void Star Tai Sui — A Simulated Star Creation Chart used in his dealings with the Great Sage, Equal to Heaven and to contain the Moon Rabbits. 225 326
• Gnosis — Received from Morax, though Saigō considered it an empty shell and recognized its connection to Sky Island. 140

Relationships

• Nangong Nayue — Contract partner and lover. Saigō supports her rule over String God Island and later selects her to inherit the Spirit of Chaos. 15 50 436 563
• Sendou Aya — Former enemy turned captive and subordinate; their relationship develops into one of demon, witch, lovers, and master-servant. 20 64
• Morax — Friend and political counterpart in Liyue. Saigō assists with governance and later cooperates with him during the Archon War. 131 137 172
• Ganyu — Treated in a father-daughter or mentor-mentee manner; Saigō guides her relationship with humanity and supports her duties in Liyue. 126 131 142
• Raiden Makoto — Wife and marriage-alliance partner. Their union is intended to secure peace between Seirai Island and Inazuma. 162 172 174
• Raiden Ei — Sister-in-law and long-term sparring partner. Saigō respects her martial dedication and trains with her for decades. 159 174
• Sangonomiya — Miko of Seirai Island and trusted follower. Saigō entrusts her with the Sword of Watatsumi Great God. 150 165
• Momonga — Close friend whose relationship with Saigō is explicitly described as friendship. 71 563
• The Pleiades Battle Maids — Devoted servants who recognize him as the Supreme Sovereign. 93 101
• Halloween Queen — Influential ally in Little Garden who supports his plans to rebuild the Takamagahara Pantheon. 226 255
• Kaling — Captive who becomes his attendant and mount after agreeing to serve him for ten thousand years. 221 226 228
• Makima — Initially a wary counterpart, later a retainer empowered and controlled by Saigō. 295 313 321
• Ophis — The Infinite Dragon God. Saigō defeats her, later chooses to help her preserve her innocence while learning about the outside world. 439 441
• Sakamaki Izayoi — Younger brother and Human Original Text candidate who inherited power. 572 641
• Saigō Homura — Younger brother and Human Original Text candidate who inherited wisdom. 572 615 641

Story Role / Major Arcs

String God Island and the Fourth True Ancestor

Saigō assists Nangong Nayue against Sendou Aya, demonstrates Decay’s lethality, and becomes involved in String God Island’s future. His interest in the Fourth True Ancestor’s Familiar Beasts drives him to obtain the Prime Bodies and the complete power of the Night Lord of Blazing Light. 20 35 78

Supreme Sovereign of Nazarick

After arriving among the Great Tomb’s NPCs, Saigō is revered as the Supreme Sovereign. He issues orders to capture rather than kill human opponents, disciplines the Pleiades, and uses Nazarick’s personnel and resources in his broader plans. 93 101 107

Liyue and the Archon War

In Teyvat, Saigō aids Liyue’s governance after Guizhong’s departure, protects its people during the Archon War, defeats Demon Gods, and works alongside Morax. His intervention turns the war in Liyue’s favor while making him both a source of reassurance for its defenders and terror for hostile Demon Gods. 131 135 137

Seirai Island and Inazuma

Following Aurobas’ death, Saigō becomes Seirai Island’s deity and seeks resources for its people. Rather than conquer Inazuma through force, he proposes marriage to Makoto, ending the immediate conflict through alliance. 154 162 165

Little Garden Demon King

Saigō enters Little Garden as a Demon King, gains Organizer’s Authority, and confronts figures such as Indra, the Great Sage, Equal to Heaven, White Night Yaksha, and Kaling. He uses Avesta and his Great Demon avatars to establish himself as a major force in the lower levels. 186 197 214 226

Gensokyo and the Devil World

While repairing Treason in Gensokyo, Saigō gradually wins Yukari Yakumo’s cooperation and chooses not to force the youkai to follow him. In the demon-plagued modern world, he becomes involved with Makima, the War Devil, Chainsaw Man, and the Special Anti-Demon Division. 258 280 321 324

Restoration, Second Rank, and First Rank

Saigō spends millennia repairing his Spirits, acquires Destruction, and later disperses the Six Great Spirits to avoid becoming a slave to evil. By merging with the Human Original Text and the Mother of Evil Gods’ Spirit, he reaches Second Rank; after learning the truth of his identity and entering Human History’s river, he ascends to First Rank. 357 436 515 641

Notable Quotes

“I am still human!” 280

“For I am Zarathustra (Zoroaster)!” 536

“Whether good or evil, when taken to an extreme, it becomes the wrong choice.” 533

Trivia

• Saigō’s original family surname was Zhang; his ancestors allegedly adopted four directional surnames after fleeing execution. 1
• He initially believed himself to be a transmigrator because the two Mother Gods placed false memories and future knowledge into his mind. 641
• He regards the Mother of Good Gods and Mother of Evil Gods as his true biological parents because they changed his fate and gave him a new life. 610
• His ultimate ideal is not to restore historical Zoroastrianism unchanged, but to become its living doctrine himself. 536