Gudako

Biodata

Feature	Value
Name	Gudako (咕哒子)
Species/Race	Artificial “special human”; a Rin-created clone/vessel tied to the System and remnants of the 666 Beast 63 66 182
Gender	Female 63 74
Affiliation	Chaldea; Rin Tohsaka’s side; Spiritual Holy Grail Ritual party 63 74 161
Occupation/Role	Rin’s disciple; Chaldea combatant; intended “King” of the Soul World 66 74
Status	Active in later Chaldea and Singularity conflicts 260 295
First Appearance	Appears in Fuyuki City with mature Shinji during a secret trial; her detailed creation is shown later 44 63

Power Progression

Stage / Realm / Level	Chapter	Notes
Fuyuki secret-trial operative	44 47	Works with the mature version of Shinji in Fuyuki City while a major battle is being prepared.
Mountain of Light / Cáthail combat state	60	Confronts the 666 beast using the power of the Mountain of Light and Cáthail.
Rin-created Gudako vessel	63	Rin prepares an external body and personality, shaping the girl into “Gudako” after confirming the world has Gudao but no Gudako.
Amnesiac, beastly awakening	63	Awakens confused and violent; Rin subdues and hypnotizes her while noting the lingering 666 Beast nature is difficult to cleanse.
Spiritual Holy Grail Ritual participant	63 65	Teams with Kiritsugu Emiya and Martha, advances through the ritual floors, and shows a growing desire to save the world.
Beast-class Spirit Foundation	66 68	Displays beastly power strong enough that Rin uses Dragon Factor to suppress her; later, her seal shows signs of weakening and beastly eyes appear.
Soul World “King” candidate	66	Rin chooses Gudako as the King needed to stabilize the Soul World’s history and mythology, with Rin herself taking the role of God.
Writhing chaos transformation	73	During the Awakened One’s battlefield, Gudako transforms into a strange mass described as the legendary writhing chaos.
Chaldea disciple awakening	74	Wakes in reality at Chaldea, about 12–13 years old, and is told by Rin that she is Gudako, Rin’s disciple.
Jewel Magecraft / Witch-King Slayer creation	92	Demonstrates Jewel Magecraft skill by creating a Noble Phantasm to summon the Witch-King Slayer.
Sainted form / national magecraft	130	Uses national magecraft in a Sainted form and is treated as a combatant capable of contending with Rin’s Ishtar form.
Anti-Evil God combat state	182 185	Fights Cthulhu after transforming into a divine-looking state, but lacks true Divinity and cannot use Angelic Magecraft; she can only assist Rin with it.
666 Beast state / Horn of Apocalypse	260	While still recovering from her 666 Beast state, blows the Horn of the Apocalypse and accelerates the world’s destruction during the final battle.

Background / History

Gudako is first mentioned operating in Fuyuki City alongside the mature version of Shinji during a secret trial 44. She later prepares for battle with Shinji as Fuyuki is sealed inside a massive barrier and shifted to another dimension 47.

Her detailed origin is revealed during Rin’s Soul World phase. Rin uses a prepared external body, the System, and Gudako’s intended personality to create a girl modeled as “Gudako,” hoping she can absorb the System and gain the qualifications to learn magecraft from A Certain Magical Index 63. Da Vinci later reflects that Gudako is not an ordinary adoptee, but a special “human” created by Rin using the internal System and the remains of the 666 Beast through a spiritron-based war 182.

Gudako awakens without memories and with unstable beastly impulses. Rin cleans up the scene, watches over her, and recognizes that the aura and beast nature of 666 cannot be fully erased even with holy marks and Spiritual System residual personalities 63. In reality, after the Soul World conflict, Rin introduces herself as Gudako’s Master and tells Gudako that she is her disciple at Chaldea 74.

Appearance

Gudako first manifests before Rin as a maiden radiating soft white light 63. After awakening in Chaldea, she is described as looking around 12–13 years old 74. Cleopatra later compares her presence to a star still shining beneath Rin’s Ishtar-like “sun” 111.

• Feminine body molded by Rin into “Gudako’s likeness” 63
• Appears as a young girl after her Chaldea awakening 74
• Can show beastly eyes when the seal on her weakens 68
• Can transform into a chaotic, monster-like form under extreme conditions 73

Personality

Gudako begins as amnesiac and instinctively violent, asking who and where she is after awakening 63 74. As she interacts with others, she develops a recognizable personality: earnest, emotionally direct, and strongly attached to the idea of saving the world 63 65.

She is often energetic and simple-hearted, rushing ahead with excitement and thanking BB sincerely even after being mocked 65 93. She also has a mischievous side, once projecting images of Ayaka’s affection for Rin to justify why Chaldea dares oppose a Root-linked existence, accepting the risk of Rin beating her afterward 172.

Gudako respects Rin deeply and trusts her judgment. When Rin arrives to take over a difficult monster battle, Gudako immediately withdraws, smiles, and warns her Master to be careful 129. In later conflicts, however, her 666 Beast state leaves her unstable enough that she struggles to control her powers and decisions 260.

Abilities & Skills

Beast-Class Spirit Foundation

Gudako carries the influence of the 666 Beast, giving her immense but unstable power 63 66 182.

• Enters a violent beast state that forces Rin to suppress her with Dragon Factor 66
• Has a seal that can weaken, revealing beastly eyes 68
• Transforms into a writhing chaos-like monster during the Awakened One’s battle 73
• Recovers from a later 666 Beast state during the final battle, showing the form has lasting aftereffects 260
• Her unusual origin is tied to her resistance against Evil God influence that even affected Rin 182

Limit: Gudako lacks Divinity, so she cannot use Angelic Magecraft such as Rocket Downpour; at most, she can assist Rin when Rin casts it 185.

Magecraft and Noble Phantasm Creation

Gudako studies and uses magecraft under Rin’s side of Chaldea 74 111.

• Demonstrates skill in Jewel Magecraft 92
• Creates a Noble Phantasm to summon the Witch-King Slayer 92
• Uses national magecraft in a Sainted form 130
• Projects images to explain Chaldea’s willingness to oppose Ayaka and the Root-linked threat 172

Combat Ability

Gudako is one of Chaldea’s major front-line fighters.

• Battles the 666 beast using the Mountain of Light and Cáthail 60
• Holds off a rapidly adapting monster for nearly two hours until Rin returns 129
• Fights Cthulhu with a club-like greatsword, dodging giant claws and blowing away Chaos mana 182
• Destroys a corroded Chaldea standard Noble Phantasm after it is contaminated by Chaos mana 182
• Blows the Horn of the Apocalypse against Arjuna, accelerating the world’s destruction 260

Soul World Role

Rin selects Gudako as the “King” needed to stabilize the Soul World’s history and mythology, while Rin takes the role of God 66.

• The role is part of Rin’s larger plan to make the Soul World gradually become real 66
• Gudako’s growth is deliberately guided by Rin, who wants to see her become stronger 63

Equipment / Weapons / Items

• Iron sword — held while drawing and writing during the monster battle before Rin’s return 128
• Club-like greatsword — used against Cthulhu’s giant claws 182
• Chaldea standard Noble Phantasm — used in the Cthulhu fight, then shattered after Chaos mana corrosion 182
• Horn of the Apocalypse — blown during the final battle against Arjuna, accelerating destruction 260
• Mountain of Light and Cáthail — powers used to confront the 666 beast 60

Relationships

• Rin Tohsaka — creator, Master, mentor, and the person Gudako trusts most; Rin calls her “my disciple” and chooses her as the Soul World’s King 63 66 74 129.
• Kiritsugu Emiya — ally in the Spiritual Holy Grail Ritual; he protects her, shares information, and later monitors her battle performance with concern 63 65 129.
• Martha — traveling companion during the Spiritual Holy Grail Ritual; carries Gudako after Rin knocks her unconscious 65 66.
• Da Vinci — knows the truth of Gudako’s creation and reacts awkwardly when Gudako questions why she resists Evil God influence 182.
• BB — playful antagonist/ally figure; pulls Gudako’s cheeks, mocks her, but is flustered when Gudako sincerely thanks her 91 93.
• Fujimaru Ritsuka — Chaldea teammate; Gudako explains Rin’s behavior to him at Millennium Castle and later acts alongside the Chaldea group 91 161.
• Mash — Chaldea teammate, frequently present in the same field operations and Drake encounter 85 161.
• Mature Shinji Matou — early partner during the Fuyuki secret trial 44 47.
• Nero — ally who trusts Rin alongside Gudako and later helps prepare the transfer of Nero’s empire into the Soul World 157 158.
• Saber Alter — ally in the final battle against Arjuna, Karna, Rama, and Kama 260.
• Sajyo Ayaka — dangerous Root-linked figure connected to Rin’s embarrassing past; Gudako exposes Ayaka’s affection for Rin through projected images 172.

Story Role / Major Arcs

Fuyuki Secret Trial

Gudako appears in Fuyuki City with the mature version of Shinji for a secret trial 44. She and Shinji later prepare for battle as a massive barrier seals the city and shifts it into another dimension 47.

Spiritual Holy Grail Ritual

Rin creates and awakens Gudako as part of the Spiritual Holy Grail Ritual, then guides her growth while concealing much of the truth 63 74. Gudako teams up with Kiritsugu and Martha, advances through the ritual floors, and begins forming her own ideals around saving the world 63 65.

Soul World Stabilization

Rin identifies Gudako as the “King” required to stabilize the Soul World’s history and mythology 66. Gudako’s instability becomes a recurring danger, especially when her beast nature resurfaces or her seal weakens 68 73.

Millennium Castle and Tokyo Battlefield

During the conflict around Millennium Castle, Gudako draws the attention of major enemies; Rin recognizes that the Six Royal Authorities intend to abduct her 85. Gudako later creates a Noble Phantasm connected to the Witch-King Slayer while Rin supports the broader battlefield from above 92.

Chaldea Operations

Gudako becomes a reliable Chaldea combatant, holding off a powerful monster until Rin returns 129. She accompanies the Chaldea group through later Singularities and conflicts, including Drake’s alliance, the Cthulhu campaign, and the final battle involving Arjuna and Kama 161 182 260.

Notable Quotes

“Martha, let’s hurry! I can’t wait to save the world!” 65

“Thank you, BB!” 93

“Master, please be careful!” 129

“Now you know why we dare to be enemies with such an existence!” 172

Trivia

• Rin creates Gudako after confirming that this world has Gudao but no Gudako 63.
• Gudako is publicly treated as an ordinary person Rin adopted for her magecraft talent, but Da Vinci knows this hides her true 666/System-based origin 182.
• Gudako once decides that risking Rin’s punishment is worth it if she can reveal her Master’s embarrassing history with Ayaka 172.
• Despite divine-looking battle states, Gudako lacks Divinity and cannot use Angelic Magecraft herself 185.