Nero

Biodata

Feature	Value
Name	Nero Claudius (尼禄) 201
Alias(es)	Maiden Emperor; Rose Emperor; King of the World 209 233 245
Species/Race	Human; later manifests as a Heroic Spirit through the Great Holy Grail 218 245 267
Gender	Female 201
Affiliation	Roman Empire 205
Occupation/Role	Roman princess; later Roman Emperor and First Consul; artist, dancer, and singer 201 205 291
Birthplace	Antium 217
Family	Daughter of Agrippina the Younger; niece of Emperor Caligula 201 218
Status	Active as the true King of the World during the confrontation with Hastur 290 291
First Appearance	Chapter 201 201

Power Progression

Stage / Realm / Level	Chapter	Notes
Royal Authority granted	202	The stolen Moon Cell authorization fragment activates and merges with her. Lunar light restores her ability to move under Rovi’s overwhelming pressure.
Roman Emperor	205	Rovi and Mars appoint her Emperor. Rovi intends to strengthen her Royal Authority through imperial rule; her natural compatibility with the Moon Cell exceeds Caligula’s.
Expanding Royal Authority	225	Rome’s territorial growth raises her standing within Human Order and deepens her Moon Cell connection. Rather than being controlled by the Moon, she begins eroding its authority.
Rose Emperor	233	Royal Authority evolves into a higher form, allowing her to traverse time and space to reach Rovi and overshadow Brunestud’s power.
Emperor of Europa / King of the World	234 235	Her empire extends beyond the Ural Mountains into North and West Asia. Her position within Human Order enables her to counter-erode the Moon Cell and share access with Rovi.
“The Glorious Empire Sung by the Virgin” manifested	245	Displays a Reality Marble embodying Roman civilization. Completing its performance ritual brings everyone except Nero under imperial suppression.
Expanded Emperor’s Privilege	252	Manifests another Reality Marble containing Roman legions and replicates a completed Holy Grail through her authority over Human Order.

Background / History

Nero was born and raised in Antium after her parents were exiled from Rome during Tiberius’s reign. Their marriage was considered unblessed, and Nero suffered discrimination because of her family. Her mother was scheming, while her father was a cruel, dissolute minor noble; neither provided comfort during her childhood 207 217.

She nevertheless regarded those years as precious because they exposed Rome’s imperfections. Long before becoming Emperor, she believed she had been born to improve the land she loved. Her original ambition was to become a perfect Roman artist and perform in the Roman Theater 205 217.

After Caligula became Emperor, Nero returned to Rome and lived in the palace. She was his most cherished younger relative, but he never trained her as his successor. His later madness turned him against royalty and everyone close to him, making Nero a target of his persecution 201 205.

Appearance

• Hair: Brilliant golden hair, styled in twin tails or tied with a red ribbon; a prominent ahoge frequently bobs or sways with her reactions 201 205 217 222.
• Eyes: Usually described as emerald green 201 202 222.
• Build: Petite and slender, with a narrow waist and a full figure 201 203.
• Clothing: Favors ornate, fiery-red dresses, including sheer fabric and rose-patterned ceremonial attire 201 205.
• Recurring imagery: Her movements and presence are repeatedly compared to flames and blooming roses 201 207 213.

Personality

Nero is exuberant, proud, and openly affectionate. She habitually calls herself a “perfect” Emperor or artist and rarely conceals what she wants. Her confidence can become capriciousness: she invokes imperial privilege to justify leaving the palace, enjoying luxury, or insisting that Rovi remain beside her 205 207 218.

Her optimism survives a genuinely unhappy upbringing. Although the world treated her harshly, she continues to consider herself fortunate and wants to embrace it. Her love of Rome does not prevent her from recognizing its defects; instead, it drives her desire to reform it 207 214 217.

She is courageous without being fearless. When confronted by Mars, she offers to stay behind so Rovi can escape, believing herself responsible for bringing him into danger. Returning to Antium still unsettles her, and she grips Rovi’s hand tightly despite her confident public demeanor 203 218.

Her apparent frivolity coexists with administrative talent and concern for ordinary people. Having experienced poverty, she understands that many commoners chiefly want survival, stability, and peace. Even when exhausted during her inspection tour, the prospect of improving Rome restores her enthusiasm 213 220.

Abilities & Skills

Royal Authority and Emperor’s Privilege

Nero’s authority originates in a fragment of Moon Cell permission. Her exceptional compatibility allows it to merge directly with her, while her growing imperial influence strengthens its connection to Human Order 202 205 225.

• Containment: Uses Moon Cell power to seal Britannia and prevent the Dragon of Albion from escaping Rovi 211.
• Time-space traversal: The evolved Rose Emperor authority lets her reach Rovi during his confrontation with Brunestud 233.
• Counter-eroding the Moon Cell: As King of the World, she draws upon Human Order to override lunar authority rather than simply receive it 234 235.
• Sharing authority: Transfers imperial power to Rovi through a kiss, opening a route to the Moon Cell and invalidating its counterattack 234 235.
• Forced manifestation: Uses King of the World authority to manifest directly from Fuyuki’s Great Holy Grail system 245.
• Holy Grail replication: Analyzes and reconstructs an existing Grail. This is replication of a finished miracle, not its original invention 252.
• Scope: Her Imperial Permission operates within the bounds of Human Order; Rovi’s later Grail replication has fewer limitations 252 253.

Reality Marbles

Nero turns her vision of Rome into manifested worlds, using civilization itself as the foundation of her power 245 246 252.

Reality Marble	Manifestation and Effects
The Glorious Empire Sung by the Virgin	A Noble Phantasm expressing the spirit, essence, and soul of all Romans—not merely Nero, the capital, or its nobility. Her dance culminates in a kiss with Rovi, completing a ritual that suppresses everyone except herself 245.
Roman legion manifestation	A separate Reality Marble containing a vast army with banners, spears, shields, javelins, and chariots. Nero presents the soldiers as both her legions and Rovi’s 252.

• Observation barrier: Outside familiars cannot see into The Glorious Empire Sung by the Virgin 245.
• Difficult to interrupt: Its unfolding is intertwined with the surrounding world, preventing Artoria from easily stopping the process 245.
• Civilizational strength: Artoria judges its power beyond what she and Atalanta can overcome in that confrontation 246.
• Specific vulnerability: Attila’s power against civilization—and Rome in particular—allows her to break it 246.

Singing and Dance

Nero treats rulership and performance as closely connected pursuits. Her dance presents the Roman golden age she sustained after Rovi’s departure, while her singing possesses a far more disturbing supernatural quality 245 291.

• Dance ritual: Her performance activates the full suppressive power of her Roman civilization Reality Marble 245.
• Chaos-derived singing: Rovi states that she learned her singing from his spirit as the Core of Chaos, giving it a voice originating from Azathoth 291.
• Effect on listeners: Her beautiful yet horrifying song affects Ritsuka and Mash as well as those around them 291.
• Against Hastur: She challenges the King in Yellow through performance; Rovi says that, irrespective of magnitude, Hastur cannot compare to the source of her voice 291.

Swordsmanship

Nero is already an agile and capable fighter before receiving Royal Authority 201.

• Quickly incapacitates several imperial guards with a Roman gladius 201.
• Attempts nonlethal strikes against Rovi rather than trying to kill him 202.
• Avoids fighting freely in crowded streets because she does not want civilians injured 202.
• Later wields Primordial Fire against Attila 246.
• Her initial sword cannot withstand Rovi, who breaks it with a finger; he also excludes her from his battle with Caligula 201 204.

Governance and Leadership

Nero combines public charisma with practical imperial administration 213 219 220.

• Organizes Britannia’s occupation and appoints Boudica as its lord 213.
• Proposes free schools, a clarified official-selection system, and wider teaching of Greek science and philosophy 214.
• Secures the surrender of hostile Roman legions by promising pardons and ordering them not to point their weapons at Rome 219.
• Reclaims military authority with Rovi’s assistance, bringing twenty-three full legions under imperial control 220.
• Handles Roman affairs capably while Rovi campaigns across Europa 225.

Equipment / Weapons / Items

• Roman gladius — Her initial weapon against the pursuing guards; Rovi twists and breaks it during their first encounter 201.
• Moon-shaped ring — An eyeball-like object stolen from Caligula’s palace. It contains the authorization fragment that activates her Royal Authority 201 202.
• Emperor’s Crown — A replica of Romulus’s crown and a symbol of Roman imperial authority; placed on her head by Rovi 205.
• Primordial Fire — A fiery-red imperial sword forged from the concept of the Seed of Civilization Rovi gave to Rome’s “Self” 246.
• Holy Grail — Appears with a genuine Grail in Fuyuki and later demonstrates that she can replicate the completed artifact 244 245 252.

Relationships

• Rovi — Mentor, first advisor, and romantic beloved. He places her on the throne; she immediately binds him to the role of her helper. Calling him her “Bard” and destined person, she knowingly supports his Moon Cell ambitions despite recognizing his initially ulterior motives 205 206 217 234.
• Caligula — Uncle and former protector. Nero investigates the Moon-derived cause of his madness and accepts his death with restored sanity as the best possible ending for him 201 202 205.
• Agrippina the Younger — Mother and a source of childhood suffering. Nero resolves to remain filial while publicly exposing her actions, describing this as both filial piety and revenge 207 218.
• Mars — Divine sponsor of her succession. He formally designates her the next Emperor at Rovi’s recommendation 205.
• Martha — Collaborator during the Britannia campaign; remains to help Nero with its administration while Rovi enters Avalon 209 213.
• Boudica — Appointed lord of Britannia under Nero’s rule 213.
• Merlin — Rovi’s disciple, who instinctively dislikes Nero and offers to expel her from their carriage. Rovi restrains that hostility 214 217.
• Athena / Einzbern — Rival for Rovi’s affection. Their competition includes jealous exchanges and deliberate provocations, though Athena avoids turning it into a genuine conflict with Rome 220 222 234.
• Artoria and Atalanta — Competitors for Rovi in the modern era; both are caught inside Nero’s Reality Marble 245 247.
• Attila — Breaks Nero’s Reality Marble and takes Rovi away. Nero does not resent her for Rome’s historical destruction, regarding it as part of civilization’s renewal, but refuses to yield Rovi to her 246.
• Hastur — The King in Yellow, whom Nero challenges as an opposing performer 290 291.

Story Role / Major Arcs

Caligula’s Madness and Succession

Instead of merely fleeing Caligula’s persecution, Nero breaks into his palace and steals the object associated with his madness. Its activation draws her into Rovi’s investigation of the Moon Cell, and the two return to the Roman court together 201 202 203.

After Caligula’s death, Rovi chooses Nero as his successor, publicly praising her courage and responsibility while privately seeking to cultivate her lunar authority. Mars approves the appointment. At her coronation two days later, Nero makes Rovi crown her and issues her first command: he must become her helper 205.

Britannia and Imperial Reform

Nero accompanies Rovi and a six-thousand-man legion toward the Britannian rebels. When he orders a withdrawal to prevent further bloodshed, she immediately backs his command. She subsequently agrees to help Martha’s refugees return home 207 209.

Her Royal Authority prevents the Dragon of Albion’s escape, contributing to the campaign that establishes actual Roman control over Britannia. The victory gives her prestige beyond the legitimacy of Mars’s appointment 211 214 215.

Back in Rome, her reform program meets senatorial obstruction. During the journey through Antium, she confronts her mother’s legacy, while the Senate’s attempt to eliminate Rovi becomes an opportunity to strip its military influence. Nero’s appeal wins the attacking legions’ surrender, and the subsequent inspection tour consolidates her rule 214 218 219 220.

Europa and the Moon Cell

Unable to accompany Rovi’s next campaign because of her imperial duties, Nero governs Rome while maintaining contact through Melly. His conquests expand both her empire and her Royal Authority 222 225.

She later reaches him during the battle with Brunestud, demonstrates the evolved Rose Emperor authority, and shares the power needed for his lunar invasion. After Nero’s disappearance, Rome begins to decline and withdraw from its conquered territories 233 234 239.

Fuyuki and the Modern World

Nero returns through the Great Holy Grail and presents her Roman golden age to Rovi within a Reality Marble. Attila interrupts the encounter and breaks the manifested civilization. Nero remains calm afterward, choosing to explore the modern world 244 245 246 247.

Her later confrontation with Artoria’s faction reveals another legion-filled Reality Marble and her ability to reproduce a Holy Grail. She subsequently travels to Eastern Ying and is the first to approach Rovi when he arrives at the Tokyo gathering before the calamities 252 262 267.

Confrontation with the King in Yellow

In the first-century Roman Empire encountered by Ritsuka and Mash, Nero appears as the true King of the World. She addresses them as travelers from later ages and sings while confronting Hastur, whose colossal yellow-robed figure looms over the era 290 291.

Notable Quotes

“I originally just wanted to be a perfect Roman artist who could perform in the Roman Theater, but since I can become Emperor... Then I, too, will become a perfect Emperor!” 205

“But I still love Rome. Because this land nurtured the perfect me!” 217

“This is my filial piety, and also my... revenge!” 218

“Artist of the evil gods... How is my performance!?” 291