Theresa

Biodata

Feature	Details
Name	Theresa (德莉莎); Theresa Apocalypse 138
Alias(es)	Otsukiyo; Stargazer; Cat Girl Titan; Aeon of Binding 166 258 261 552
Species/Race	Aeon of Binding; a conceptual entity 261 295
Gender	Female
Affiliation	Astral Express Stellaron Hunters / Trailblazers 314 551
Occupation/Role	Trailblazer, protector, and wielder of the Oath of Judah 8 314
Status	Active 608
First Appearance	Chapter 6

Power Progression

Stage / Realm / Level	Chapter	Notes
Vishnu Hyper-Mutation Factor activation	8	Oath of Judah converts absorbed Antimatter Legion cores into Imaginary Energy, causing the Vishnu Factor to multiply and evolve Theresa’s cells.
Envoy of Joy	15 16	Aha grants her the Power of Joy through a mask. Her Immortal Power assimilates it instead of allowing her personality to be overwritten.
Herrscher of Binding — growth stage	82 138	A light cocoon forms a winged nascent soul-like figure; Theresa is later recorded as a “Herrscher of Binding in Growth.”
Second Metamorphosis / Immortality Envoy	138	She consumes concentrated Abundance power, evolves her Vishnu Factor, gains an eternally youthful body, and improves her physical condition by more than a hundredfold.
Heavenly Wisdom Imprint	146	Su’s imprint grants the Wheel of Causality, a barrier capable of reflecting attacks that do not exceed Theresa’s resistance.
Envoy of Abundance	166	Yaoshi recognizes Theresa as an Envoy, linking her to a vast current of Abundance power and maturing her Stargazer form.
Aeon of Binding	261	Theresa discloses that she is the Aeon of Binding from the Astral Express.
Immortal Stance	491	By using the Stone Mask as part of a transformation, she manifests dragon horns, a dragon tail, three pairs of dragon wings, and the Shadow of Yinglong.

Documented Attributes

Theresa’s recorded Immortal attributes after her second metamorphosis are as follows. The system’s exact scale is not explained. 138

Attribute	Recorded value
Immortal Power	40
Immortal Speed	50
Immortal Body	60
Immortal Will	80

Background & History

Welt initially verifies Theresa’s identity after noticing her pure white hair and the Oath of Judah, ruling out the possibility that she is Void Archive in disguise. She subsequently travels with the Astral Express group and demonstrates that, despite her small appearance, she is capable of overwhelming force. 6 8

During her early journey, Theresa absorbs energy through Oath of Judah and awakens the Vishnu Hyper-Mutation Factor. Aha later grants her the Power of Joy, but her existing Immortal Power converts both Joy and her prior Destruction Energy into compatible strength, preserving her ordinary personality. 8 16

Theresa later reveals that she comes from a parallel universe. She accidentally selected a spacetime node and passed through a colorful door into another world; she insists that she is still “the one and only Theresa,” rather than the future version of that world’s Academy Head Theresa. 256 258

At St. Freya, Theresa finally identifies herself as an Astral Express Stellaron Hunter and the Aeon of Binding. Her stated mission is to trailblaze across the stars, assist planets in crisis, and eventually unravel the Imaginary Energy tidal belt surrounding the Solar System. 261 314

Appearance

Theresa’s appearance changes extensively with her forms. Her earlier body is petite and youthful, with pure white hair and blue eyes, while her usual grown Otsukiyo form is approximately 1.65 meters tall, with white hair, red eyes, a mature figure, and white cat ears. 6 16 258 298

• Otsukiyo form — A mature, white-haired, red-eyed form that resembles an adult Theresa but originates from a parallel universe. 258
• Herrscher of Flames form — A Kiana-inspired appearance wearing the purple-and-white Time-Shimmering Light Chaser battle dress, a crown-like ornament, mismatched purple and white stockings, and a high ponytail with blue streaks. 100
• Stargazer growth form — A mature form in a golden-green immortal robe with a laurel-like hair accessory; Oath of Judah becomes a matching palm-leaf fan. 166
• Immortal Stance — Features silvery-white dragon horns, a scaled dragon tail, three pairs of dragon wings, crimson eyes with silver-white diamond-shaped pupils, and the phantom Shadow of Yinglong. 491
• Aeon form — Wears an ornate golden-white conceptual gown, carries a platinum winged scepter, and is surrounded by countless platinum wings. 239

Personality

Theresa is playful, mischievous, and prone to elaborate pranks, particularly when she sees an opportunity to tease powerful or overly serious people. She frequently uses shapeshifting and theatrical displays to unsettle others, though she is willing to apologize when a joke genuinely frightens her friends. 290 298 314

Beneath that behavior, Theresa is protective and compassionate. She comforts Kiana during an emotional breakdown, offers to help St. Freya fight the Honkai, provides food for refugees on Onparos, and seeks to restore people who have been lost or trapped. 256 261 316 552

She is also more strategically minded than her childish image suggests. Welt notes that she has become capable of considering the consequences of helping others and of using surrounding crises to strengthen herself while reducing future harm. 156

Abilities & Skills

Authority of Binding

As the Aeon of Binding, Theresa can restrain, seal, and suppress opponents with Binding-based powers.

• Creates barriers capable of containing catastrophic force; her Binding Barrier prevents an attack that could have destroyed Earth. 272
• Immobilizes groups of opponents and can restrain the Servants of the Flame before they initiate combat. 298
• Condenses her Binding power into crystals and transfers the Herrscher of Binding Core from Oath of Judah into Academy Head Theresa. 321
• Her basic Aeon-form attack can fire a white-and-gold beam powerful enough to annihilate the living planet World-Devouring Luofu. 418

Immortal Power and Abundance

Theresa’s Immortal Power converts and harmonizes incompatible energies within her body.

• Converts both Destruction Energy and the Power of Joy, preventing Joy from changing her personality. 16
• Grants immunity to Mara-struckness and allows eternal youth unless Theresa is killed or chooses to cease existing. 138
• Reinforces her bones with Abundance power and produces defensive energy films from patterns within them. 138
• Allows her to absorb and refine concentrated Abundance power rather than being corrupted by it. 138 163

Oath of Judah

Oath of Judah is Theresa’s primary Divine Key and can change between weapon, accessory, and humanoid forms.

• Deploys a massive sword array that pulverizes enemies and absorbs their energy for Theresa. 8
• Uses Heavenly Judgment, a vast magic circle that crushes enemies and absorbs Abundance power through a central black hole. 163
• Can become a necklace for concealment, a feather fan, a palm-leaf fan, or a Chainsaw Greatsword. 7 156 166 272
• Can be given a humanoid form resembling Kallen, after which it is tasked with protecting Academy Head Theresa. 321

Wheel of Causality

The Heavenly Wisdom imprint manifests as a pale-green Wheel of Causality around Theresa.

• Reflects incoming attacks so long as their power does not exceed Theresa’s resistance. 146
• Was awakened by Theresa’s fury at lives being trampled, turning that anger into a resolve to protect others. 146

Shapeshifting

Theresa can assume numerous female forms through the power of Joy and abilities such as Fool’s Thousand Faces.

• Can imitate forms including Herrscher of Flames Kiana, Stargazer, Traveler Lumine, and Herrscher of Finality. 100 166 295 297
• Uses disguises tactically, including feigning weakness in Stargazer form to expose Tingyun’s connection to Phantylia. 163
• Cannot transform into male forms. 100
• Her transformations can include altered weapon configurations, such as the crystal-based greatsword associated with her Herrscher of Flames form. 105

Space-Time and Material Manipulation

Theresa can travel and intervene across vast distances.

• Opens portals that relocate approaching Anti-Entropy and Destiny warships near the Far East. 256
• Uses portals to arrive unexpectedly in the Dominion Theater and disrupt the Herrscher of Thousand’s plan against Kiana. 252
• Creates food from thin air to feed refugees on Onparos. 552
• Uses Imaginary storage to collect and retain liquid Soulsteel. 261

Imprints and Resurrection

Theresa possesses multiple Servants of the Flame imprints, including those of Chiyou, Su, Elysia, and Aponia. 272

• Forms the Seal of the Ring from thirteen imprints. 272
• Acquires blood samples of the Thirteen Servants of the Flame through Immortal Power and uses them to restore their bodies. 311
• Resurrects the Previous Civilization’s Thirteen Flame-Chasers and arranges for them to live at St. Freya. 316
• Plans and performs restorations for other lost figures, including Yae Rin, Yae Sakura, and Joyce. 293 327

Equipment / Weapons / Items

• Oath of Judah — Theresa’s Divine Key, capable of becoming a cross, necklace, fan, greatsword, weapon array, or humanoid companion. 7 8 321
• Wise Stone Mask — A mask granted by Aha; Theresa initially fears that wearing it may cause drastic change. 16
• Imaginary Storage Bracelet — Used to store liquid Soulsteel collected after Otto’s body is destroyed. 261
• Platinum Winged Scepter — Carried in Theresa’s Aeon form. 239

Relationships

• Himeko — Close companion whom Theresa calls her younger sister; they work together in major plans and often show open affection. 59 300
• Welt — Fellow Astral Express member and frequent straight man to Theresa’s antics; he recognizes her increasing strategic ability and accepts her help in ascending as the Herrscher of Reason. 156 216
• Kiana — Theresa’s niece in the Honkai-world arc; Theresa rescues her from the Dominion Theater and comforts her through grief and guilt. 252 256
• Academy Head Theresa — Theresa’s parallel-world counterpart; Theresa reassures her, assists her growth, and transfers the Herrscher of Binding Core into her body. 258 321
• Elysia — A friend and source of the True Self imprint; Elysia ultimately accepts Theresa’s apology after her Herrscher of Finality prank. 272 298
• Acheron — Loyal traveling companion who accompanies Theresa during Etherium Spirit hunting and openly protects her from threats. 517 602
• Oath of Judah — Theresa’s Divine Key and transformed companion; it recognizes Academy Head Theresa as its fourth user and receives Theresa’s order to protect her. 321
• Chiyou — A frequently antagonized but increasingly cooperative Servant of the Flame; Theresa defeats him in combat and repeatedly teases him. 302 314

Story Role / Major Arcs

• Joining the Astral Express — Theresa is verified by Welt, uses Oath of Judah to clear the Herta Space Station of Antimatter Legion forces, and becomes an Envoy of Joy after Aha’s intervention. 6 8 16
• Belobog — She investigates suspicious activity, confronts a ghost in the Lower City, and leads the “Teruriri Magical Team” in the Fighting Club challenge. 33 34 42
• Xianzhou Luofu — Theresa adopts several forms during the Luofu crisis, gains Abundance power, defeats large numbers of Medicine Master’s Legacy followers, and becomes an Envoy of Abundance. 100 163 166
• Honkai World intervention — She arrives at the Dominion Theater in time to help Kiana resist the Herrscher of Thousand, then reveals herself as the Aeon of Binding at St. Freya. 252 261
• Garden of Eternity — Theresa gains the Servants of the Flame’s trust, frees them from the quantum computer’s limitations, and resurrects the Thirteen Flame-Chasers. 300 311 316
• Onparos — Locals identify Theresa with the legendary Cat Girl Titan. She protects refugees, becomes involved with Onparos’s past, and earns the title after transforming corrupt officials into animals. 552 604 608

Notable Quotes

“The way to face fear is to eliminate it. What good does fear do besides make your hands and feet go weak and embarrass you?” 34

“My name is Theresa. Apocalypse holds no meaning for me anymore. I am one of the Stellaron Hunters from the Astral Express, outside the solar system, and also the Aeon of Binding.” 261