Kashu

Biodata

Feature	Details
Name	Kashu Animusphere (卡修)
Alias(es)	Commander-in-Chief; Radiant Dragon Holy Sword; Master of Swords; Child of the Stars; Savior
Species/Race	Human magus and adventurer; later recognized as a god through usurped divine Authority 158 203
Gender	Male
Affiliation	Loki Familia; Demon Slayer Corps; Hagun Academy; Clock Tower; Chaldea; No Name
Occupation/Role	Adventurer, knight, magus, Master, Commander-in-Chief, world-saving combatant
Status	Active
First Appearance	Chapter 2

Power Progression

Stage / Realm / Level	Chapter	Notes
LV.2	7, 29	Loki initiates his first documented level-up. His post–Demon Slayer status records every basic ability at SSS (2000) and grants the skills Red Dragon Emblem, Eternal Blessing of the Star Spirit, Brilliant Journey, and Transparent World.
LV.4	37	Registers at the Guild as an LV.4 adventurer, revealing he is far beyond the novice appearance others expected.
Mage Development Ability	62	Chooses the Mage Development Ability during Loki’s advancement ceremony; his Magic value has reached SSS (2000).
LV.5	139	Reaches Level 5, startling the Loki Familia.
Divine Authority / Godhood	158	Defeats Melqart with Tyrannical Space-Sunder; the Ring of Usurpation transfers the God King’s divine power to him.
LV.6	159	Status records Authority of the Heavenly God, Crystal of Stars, and Ideal Land; Miracle rises from B to S.
Savior Starlight	178	Awakens the holy sword Savior Starlight, but initially struggles to restrain its planetary life-draining power.
LV.7	256	Completes a world-bestowed ascension ritual. Miracle reaches SSS, while Swordsman, Magecraft, Shatter, and Authority reach S.
LV.7 — Attribute completion	308	All five basic attributes reach SSS (2000); Swordsman, Magecraft, Shatter, and Authority advance to SS.
Savior Divinity	304	Little Garden recognizes his repeated world-saving feats and grants him the Divinity of Savior.

Appearance

Kashu is a silver-haired young man with silver eyes, most often seen in formal magical attire or clothing suited to the world he is visiting. He normally carries a sword at his waist and is frequently accompanied by Fou. 117 221 256

• Silver hair and silver eyes.
• Calm, refined bearing that often causes others to mistake him for an experienced knight rather than a newcomer.
• Wields an ornate holy sword that manifests amid golden motes of light. 63 87
• Commonly wears Chaldea-style formal clothing outside combat. 48
• Often keeps Fou on his shoulder, in his collar, or in his arms. 26 79 271

Personality

Kashu is composed, blunt, and difficult to intimidate. He tends to assess a situation before acting, whether he is studying ley lines in Fuyuki, exposing flaws in Hagun Academy’s selection process, or identifying an enemy’s hidden agenda. 43 98 59 He dislikes wasting time on performative combat and favors real battles with meaningful stakes. 43

His calmness does not mean passivity. Kashu is openly ruthless toward enemies who endanger civilians or exploit others, including demons, corrupt officials, and hostile magi. At the same time, he consistently protects people who cannot protect themselves, such as Nezuko, Haruhime, festival spectators, and communities under attack. 10 154 192 304

He has a scholarly curiosity about unfamiliar powers, bodies, and systems. This is evident in his interest in Nezuko’s demon physiology, his rapid analysis of Blazer abilities, and his willingness to learn spatial manipulation from Shiroyasha. 11 186 304 Despite his overwhelming strength, he can be playful with Fou and teasing toward friends or rivals. 21 59

Abilities & Skills

Holy Sword

Kashu’s central weapon is a holy sword associated with King Arthur’s legacy. It possesses immense destructive power, carries the Thirteen Restraints, and is meant to be used against catastrophes threatening the world. 112

• Can manifest directly into his hand amid golden light. 63 87
• Was used as a Holy Relic catalyst when he summoned Merlin. 87
• Creates massive ravines and can overwhelm Servants or armies in a single attack. 129 130
• Absorbed the purified power of the Greater Grail, beginning its transformation. 133
• Later becomes Savior Starlight, an ultimate armament combining the authority of salvation with starlight. 178 256
• Its power can exhaust Kashu or become hazardous when insufficiently controlled. 177 178

Avalon / Ideal Land

Kashu possesses Avalon, described as King Arthur’s gift and an imitation of the immortal isle of apples. 133 159

• Generates an absolute golden crystal barrier that neutralizes Angra Mainyu’s black mud and its Noble Phantasm-level attacks. 112
• Protects him from Achilles’s final chariot attack. 131
• Enhances defense, recovery, and healing ability as Ideal Land. 159 256
• Its interference strength fluctuates with Kashu’s magic power. 159

Miracle and Divine Authority

After defeating Melqart, Kashu gains the Authority of the Heavenly God and the capacity to exercise miracles. 158 159

• Uses divine Words of Power to command wind, lightning, and divine radiance. 160 163
• Can reshape rules and seal dimensional rifts through Miracle. 280
• Uses divine power to shield civilians from Ressen Hiraga’s attacks. 192
• Can grant others temporary power, including Anna’s dragon-slaying blessing. 287
• His Authority eventually becomes strong enough that Loki’s blessing can no longer remain on him. 203

Transparent World

A perception state Kashu introduces to the Hashira as a means of perfectly controlling strength and predicting attacks. 20

• Allows him to observe minute physical details and combat patterns.
• Lets him see through Nagi Arisuin’s harmless façade. 48
• Supports rapid analysis of opponents’ Devices, curses, and combat styles. 186
• Enhances conscious perception through the Red Dragon Emblem. 29 159

Wind Manipulation

Kashu employs wind as both a combat element and a means of movement.

• Controls water and wind pressure in Dungeon combat. 6
• Uses Wind King’s Barrier to conceal his sword and deflect wind-blade attacks. 59
• Commands Thousand Winds for flight, transportation, and battlefield control. 256 274
• Uses wind to restrain opponents, redirect attacks, and catch objects at range. 333 337

Combat Analysis and Imitation

Kashu can quickly understand and reproduce techniques after observing them.

• Replicates Ikki Kurogane’s Mirage Wolf after seeing it once. 44
• Uses Imitation: Dominating Heavenly Star to dispel Amphisbaena’s mist and reverse the Floor 27 battle. 65
• Studies Edelweiss’s connection to her Device during their duel. 181 182
• Analyzes Amane Shinomiya’s causality-based curse and turns its fatal result back on its user. 186

Spatial Manipulation

Kashu possesses and develops spatial techniques across multiple worlds.

• Uses simulated black holes to immobilize Soma Familia members. 40
• Seals Kiritsugu Emiya and Irisviel inside a pitch-black void. 111
• Learns spatial manipulation directly from Shiroyasha, receiving extensive knowledge through her instruction. 304
• Can open dimensional gateways for interworld travel. 271 342

Limit Overclock

A high-risk amplification skill that ignites divine radiance and independently updates Kashu’s attributes. 256

• Greatly boosts Miracle and Authority while active. 256
• Was used at full output against Melqart, Karna, and Achilles. 158 131
• Causes substantial backlash once its activation ends. 131

Equipment

• Holy Sword / Savior Starlight — Kashu’s primary divine weapon, later transformed through purified Grail power and salvation authority. 133 178 256
• Avalon — A defensive gift tied to King Arthur and the immortal isle of apples. 133 159
• Durandal — An indestructible holy sword purchased from Tsubaki for 350 million Valis. 139
• Gram — Kyouya Mitsurugi’s magic sword, forcibly claimed by Kashu after defeating its original wielder. 228
• Golden Cudgel — A staff weapon used against Jiao Liu; its appearance recalls the Six-Eared Macaque’s weapon. 330
• Ring of Usurpation — Epimetheus’s damaged ring, which enables the slaying of gods and transfer of their Authorities. 157 158
• IPS Regeneration Capsule blueprints — Medical-device plans Kashu presents to Finn, Riveria, and Gareth. 62

History

Orario and the Dungeon

Kashu begins his documented journey in Orario, where he receives a Status and tests his abilities against kobolds in the Dungeon. 2 His growth is abnormally rapid, drawing Loki’s suspicion and attention after his ability values rise dramatically within a day. 4

He pushes into deeper Dungeon floors, battles Minotaurs and snakefish, and deliberately trains weaker parameters rather than immediately rushing another level-up. 4 6 Loki guides him through the adventurer advancement system and later conducts his Mage Development Ability ceremony. 6 62

Demon Slayer Corps

After passing through a dimensional gateway, Kashu enters the world of demon slayers. He kills Rui, saves Tanjiro Kamado, heals him, and presents himself to Giyu Tomioka as a European knight responding to the Voice of Revelation. 8

Kagaya Ubuyashiki invites Kashu to aid the Corps after foreseeing him wielding a platinum holy sword against Muzan Kibutsuji. 11 Kashu becomes interested in Nezuko’s ability to retain her humanity as a demon and stays at the Butterfly Mansion to observe her condition and review the Ubuyashiki family’s records. 11

After effortlessly defeating Tengen, Sanemi, and Obanai, Kashu teaches the Hashira about the Transparent World. Kagaya establishes the position of Commander-in-Chief for him and orders a month of intensive training. 20 The Corps later holds a farewell celebration when Kashu departs the world. 29

Hagun Academy

Kashu enrolls at Hagun Academy as an A-Rank Blazer and immediately criticizes Chairman Kurono Shinguuji’s single-elimination selection format for the Seven Stars Sword-Art Festival. 42 Kurono accepts his proposal to postpone the tournament and grants him authority over the selection process. 43

He becomes Ikki Kurogane’s dorm mate, reproduces Ikki’s Mirage Wolf technique, and helps Stella Vermillion awaken the dragon-like origin beneath her flame magic. 43 44 55 Kashu later defeats Ouma Kurogane, uncovers the Yingzhou Branch’s connection to the Rebel Army, and helps expose its conspiracy. 59 61

Upon returning for the Seven Stars Sword-Art Festival, Kashu defeats Amane Shinomiya’s causality-based power and protects spectators from Ressen Hiraga’s hostage tactics. 186 192

Holy Grail Wars

Kashu uses his holy sword as a catalyst to summon Merlin, although Fou’s interference alters the ritual. 87 He forms a Master–Servant contract with Merlin and investigates Fuyuki’s ley lines during the Holy Grail War. 88 98

He fights Artoria, confronts Angra Mainyu, and advances through the black mud surrounding the Shinto Civic Center under Avalon’s protection. 107 109 112 After purifying the corrupted Greater Grail, he absorbs its power into his holy sword and reveals that he comes from a parallel world. 133

In the later Red and Black Holy Grail War, Kashu joins the Clock Tower’s side, summons Mordred, and refuses to rely on the Holy Church’s joint operations. 115 116 117 118 He battles Servants of Black, withstands attacks from Karna and Achilles, and ultimately defeats Shirou Kotomine’s side. 129 130 131 133

Godslayer Demon Kings

Kashu awakens in the Hidden World, where Epimetheus explains the Ring of Usurpation and the ritual allowing humans to kill gods. 157 Kashu defeats the God King Melqart with Tyrannical Space-Sunder, survives the collapse of the dimension, and inherits Melqart’s divine Authority. 158

Guinevere and Lancelot mistake him for King Arthur after he appears with the Savior Divine Blade. Kashu accepts their aid but chooses to target Godslayer Demon Kings rather than blindly follow their expectations. 159 160 He fights Luo Hao, learns to combine Authority with martial arts, and reveals himself as a Child of the Stars during the battle at Takamagahara. 173 175

Following Takamagahara’s destruction, Kashu awakens Savior Starlight and leaves the world after reclaiming the Godslayers’ Authorities, though he is temporarily unable to return to the Type-Moon world because of his unstable power. 178

Chaldea and Human Order

In a post-apocalyptic desert beneath the Light of Human Order Incineration, Kashu completes his LV.7 ascension ritual and searches for Mash Kyrielight. 256 He confronts the Lion King in the Holy City, defeats her in a clash of divine Authorities, and reunites with Mash after Fou reveals their connection. 258 260

Kashu later enters the Seventh Singularity alongside Artoria and Mordred. He helps defend Uruk, seals a rift beneath Eridu Temple, confronts the Goddess of Demonic Beasts, and investigates the Underworld’s spreading Authority of Death. 277 280 281 283

Little Garden

Kashu reaches Little Garden and joins No Name after encountering Izayoi Sakamaki and Black Rabbit. 300 The world recognizes his history of salvation by granting him the Savior Divinity, and Shiroyasha teaches him spatial manipulation. 304

He provides supplies to No Name through his pocket dimension, gives the Divinities of King Arthur and Knights of the Round Table to Artoria and Mordred, and repeatedly acts to defend the community from Demon Lords and invading forces. 304 320 He later breaks the rules of a Gift Game to kill a pure-blooded dragon with Excalibur Soteria and takes Ophiuchus’s Sun Authority. 323

Relationships

• Fou — Kashu’s constant familiar and companion. He indulges Fou’s appetite for treats, calms him when he fights Merlin, and later learns that Fou is Cath Palug. 2 87
• Loki — Patron and adviser within the Loki Familia. She guides his early level-ups, investigates threats around him, and later confronts him after realizing he has become a god. 4 6 203
• Kagaya Ubuyashiki — Leader of the Demon Slayer Corps who recruits Kashu based on his foresight and names him Commander-in-Chief. 11 20
• Tanjiro Kamado — Ally Kashu saves from Rui; Tanjiro later joins the Corps in bidding him farewell. 8 29
• Stella Vermillion — Hagun classmate and partner. Kashu helps her recognize the deeper origin of her dragon power, and their bond grows through the Festival conflict. 55 183
• Ikki Kurogane — Dorm mate and fellow swordsman. Kashu copies Ikki’s Mirage Wolf and takes an interest in his concealed potential. 43 44
• Merlin — Kashu’s Caster-class Servant in the Fuyuki Holy Grail War. Kashu distrusts Merlin’s laziness but relies on his illusion magecraft and commitment to protecting Human Order. 88 112 274
• Mordred — Kashu’s Saber-class Servant and frequent combat partner. Though argumentative, she consistently follows his orders and remains loyal through multiple Holy Grail conflicts. 117 129 131
• Artoria — A recurring rival and ally. Kashu clashes with her in Fuyuki and the Holy City, then later fights beside her in Chaldea and Uruk. 107 258 280
• Guinevere and Lansia — Allies from the Godslayer world who regard Kashu as their king and follow him against Demon Kings. 159 160
• Kazuma Satou — Fellow otherworlder and temporary party member in Axel. Kashu considers him more dependable than Aqua, despite repeatedly distancing himself from Kazuma’s behavior. 221 224
• Mash Kyrielight — A person Kashu seeks after his ascension. Their reunion is prompted by Fou, and Kashu aids Chaldea’s effort to restore Human Order. 256 260

Notable Quotes

“You can't wake someone pretending to sleep with words alone. Just like before, I'll personally shatter your stubborn delusion!” 258

“Trash belongs in the bin.” 280

Trivia

• Tsubaki’s attempts to replicate Kashu’s holy sword could not reproduce even one ten-thousandth of its divine essence. 139
• Kashu bought Durandal for 350 million Valis. 139
• Fou’s interference in Kashu’s Servant-summoning ritual results in Merlin answering the call rather than the Knight of the Round Table Kashu expected. 87
• He refuses mock battles at Hagun Academy because he considers real combat fundamentally different from fantasy-form duels. 43