Yang Xiao

Biodata

Feature	Details
Name	Yang Xiao (杨枭)
Alias(es)	Flash; Payne
Species/Race	Human; Transmigrator
Gender	Male
Age (at introduction)	15 1
Birthday	August 1 1
Height	172 cm 1
Weight	55 kg 1
Affiliation	U.A. High School Hero Course Class 1-A; Problem Solver; Akatsuki Organization
Occupation/Role	Hero student; Problem Solver coordinator and combat operative; leader of the Akatsuki Organization
Quirk(s)	Holy Light → Light-Dark Power
Status	Active; departed for the next world with Kawa Himeyuki 337
First Appearance	Chapter 1

Power Progression

Stage / Realm / Level	Chapter	Notes
Holy Light LV1	1	Begins with the prototype of Holy Light. Its energy can eventually manifest weapons, armor, and shields; his initial combat power is sufficient to shatter walls.
Holy Light LV2	56	Can divide Holy Light across multiple body parts for reinforcement and defense during his first battle with Zheng Yingshan.
Tenth Mortal Realm	60	His established realm before treatment for Zheng Yingshan’s Nether Point strike.
Sixth Realm of the Sixth King Realm	63	Reaches a new realm after recovering and completing a week of intensive training under Shinpachi Shimura.
Black Iron Rank 2	161	Earns an upgraded Underground City token after defeating Tuo Liang in a Death Race.
Light-Dark Power LV3	178	The Blue Moon Demonic Blade’s dark aura merges with his Holy Light Source, mutating his Quirk and granting a Dark Sword.
Silver Rank 1	181	Rapidly advances from Black Iron Rank 2 after defeating competitors in the Underground City.
Gold Rank	187	Secures promotion after defeating Meat Mountain and incorporating traits of opponents’ Quirks into his techniques.
Light-Dark Power LV6	271	Holds a two-level Quirk advantage over Zheng Yingshan’s LV4 power.
Light-Dark Power LV7	280	Reaches Level 7 following the Kamino period and begins adapting to his rapidly increased power.
God-level Domain, intermediate	325	His power reaches the God-level Domain before he completes his final advancement.
Light-Dark Power LV10 / beyond God-level Domain	327	Absorbs the Supreme’s power and remaining Immortal Water, reaches maximum Quirk Level, and enters an unnamed realm beyond the God-level Domain.

Background

Yang Xiao is a transmigrator who arrives in the world five years before the Darkest Era. He receives the Holy Light Quirk and learns that his role is to contribute to the coming conflict while guarding against the other transmigrators. Initially living alone in a small Baoxu City apartment, he trains his body and Quirk at Seaside Park while preparing for U.A. High School’s entrance examination. 1 2 3

He deliberately keeps his strength hidden in his early U.A. days. Yang Xiao views exposure as dangerous: attracting attention could reveal him to the other transmigrators before he is ready to face them. 39

Yang Xiao becomes involved with the Problem Solver, first working in its core hub as a mission coordinator. After Zheng Yingshan cripples his Nether Point during the USJ period, the organization shelters him, arranges Qiao Nansan’s treatment, and has Shinpachi Shimura rebuild his condition through extreme training. 41 56 60 63

Following his recovery, Yang Xiao transitions into a combat operative. The Problem Solver assigns him dangerous solo infiltrations and gang-assassination missions specifically to temper his abilities. 64 68

Appearance

At his introduction, Yang Xiao is a lean teenage boy measuring 172 cm and weighing 55 kg. 1 His Quirks frequently alter his appearance in combat through golden radiance, black darkness, and later gray energy.

• A faint golden dot pattern on his right palm is the origin point of Holy Light. 1
• A golden circle on the back of his hand displays his personal Quirk information. 1
• Holy Light can cause his hair, hands, feet, chest, and back to glow. 26
• He adopts a black Akatsuki-style outfit and a spiral orange mask for his Underground City identity. 179
• At maximum power, he elementalizes into the Justice Punisher. 337

Personality

Yang Xiao is driven by self-improvement and survival. He trains constantly, seeks out difficult missions, and treats dangerous opponents as opportunities to stimulate his potential. His first near-fatal defeat by Zheng Yingshan leaves him determined never to underestimate another opponent. 63 72

He is calculated about revealing strength, preferring to stay inconspicuous until he has enough power to protect himself. In battle, however, he can be ruthless toward hostile strangers and Underground City opponents. 39 179 192

Despite this pragmatism, Yang Xiao is loyal to those he considers his own. He wants to keep Toga Himiko from joining the League of Villains, recruits and protects Shinso Hitoshi, and remains concerned for the Problem Solver and his former classmates after returning from the Giant World. 12 17 147 331

Abilities & Skills

Holy Light

Yang Xiao’s original Quirk is the saint-like power of Holy Light. It grows through ten levels, with each level doubling its energy and expanding its ability to create constructs. 1

• Produces Light Swords, shields, armor, and defensive layers. 1 143 148
• Covers individual limbs or multiple body parts to reinforce his strikes and defense. 6 56
• Emits intense light capable of blinding cameras and obstructing an opponent’s vision. 39 62
• Enhances his speed through light-infused footwork, including Flash Leg. 66 174
• Generates heat through crimson light for Blazing Red Leg, combining thermal force with high-speed kicks. 76
• Can create Holy Light Shields in mid-air to block projectile attacks and conceal weaknesses from Death God’s Eye. 272

Light-Dark Power

The dark aura within the Blue Moon Demonic Blade merges with Yang Xiao’s Holy Light Source while he sleeps, mutating Holy Light into the dual-attribute Light-Dark Power. The two opposing energies coexist within him, though their balance initially worries All Might. 178 188

• Grants a Dark Sword upon mutation. 178
• Forms viscous, flexible darkness more suited to whips, ropes, claws, and cloaks than rigid Light constructs. 179
• Creates a dark cloak-like defense that can swallow incoming attacks, including sweat bombs. 179 192
• Can imitate or incorporate traits from opponents’ Quirks; he reproduces the Ring Blade King’s ring blade and later strengthens his techniques with Meat Mountain’s durability. 181 187
• Allows elemental transformation into light and darkness, leaving him without an obvious elemental natural enemy. 261
• Reaches LV10 after absorbing the Supreme’s power, placing Yang Xiao beyond the God-level Domain. 327

Source States

Yang Xiao can fully unleash the sources of his two Quirks, but the states impose severe exhaustion.

• Gear One — Full release of either the Golden Source or Dark Source. His golden state initially lasts five minutes and leaves him unable to use his Quirk for a day afterward. 149 274
• Gear Two — Combination of the Holy Light and Dark Sources, producing gray energy. It can maintain his enhanced state until exhaustion and is powerful enough to neutralize Zheng Yingshan’s ultimate attack. Afterwards, Yang Xiao temporarily becomes an ordinary person without Quirk power. 273 274
• Justice Punisher — Yang Xiao’s ultimate elementalized form, used after surpassing the God-level Domain to defeat Zheng Yingshan and Han Guang in one attack. 337

Sky-Turning Black Seal

A high-level technique revealed during the final confrontation with Zheng Yingshan and Han Guang.

• Manifests as a powerful black seal capable of overwhelming God-tier opponents. 336
• Is used while Yang Xiao fights both enemies simultaneously in the sky. 335 336

Physical Combat and Resilience

Yang Xiao regards his body as the vessel required to fully use his Quirk, leading him to focus heavily on endurance, flexibility, strength, and hand-to-hand combat. 3 39

• Defeats numerous opponents through single punches or kicks, including Shinso Hitoshi and several villains. 26 142
• Combines Quirk reinforcement with close-quarters combat rather than relying solely on ranged constructs. 111 148
• Demonstrates unusual recovery; Qiao Nansan notes that his recovery from the Nether Point injury would be nearly impossible for an ordinary person. 63
• Uses a time-limited regenerative state to survive Tuo Liang’s assault and defeat him. 161

Equipment / Items

• Blue Moon Demonic Blade / mysterious dagger — A dagger taken from Hei Mu Village. Its dark aura mutates Yang Xiao’s Quirk, and it later serves as the key to the interworld passage within the Egyptian Pyramid. 175 178 199
• Akatsuki outfit and spiral orange mask — Worn for his Underground City identity. 179
• Underground City rank tokens — Used to track his progression from Black Iron through Gold Rank. 161 181 187
• Personality supplement — A life-saving, stamina-restoring item gifted by Qi Feng. 214

Relationships

• Wu Shiyin — Leader of the Problem Solver and one of Yang Xiao’s principal supporters. Wu arranges treatment after the Nether Point injury, entrusts Yang Xiao with missions, and later recognizes him as Payne. 41 60 332
• Shinpachi Shimura — Trainer and Problem Solver associate who pushes Yang Xiao through recovery, sparring, and combat training until he reaches the Sixth King Realm. 60 63
• Toga Himiko — Problem Solver colleague. Yang Xiao hopes to prevent her from falling into the League of Villains and later earns her admiration through his competence and strength. 12 17 64
• Shinso Hitoshi — Initially defeated by Yang Xiao at the Sports Festival; Yang Xiao invites him to join his side and later protects him from Zheng Yingshan’s recruitment efforts. 142 147 189
• Kawa Himeyuki — Fellow transmigrator and intelligence contact who initially outclasses Yang Xiao in realm. She later reunites with him after the final battle, and the two choose to continue to the next world together. 135 337
• Qi Feng — Fellow transmigrator, interworld ally, and close friend. Qi Feng helps Yang Xiao access another world’s resources and risks his life to protect him while he absorbs the Supreme’s power. 203 205 326 327
• Zheng Yingshan — Rival transmigrator and recurring enemy whose Death God’s Eye nearly cripples Yang Xiao. Yang Xiao ultimately defeats him during the final battle. 56 272 337
• Han Guang — Transmigrator and ally of Zheng Yingshan. He repeatedly seeks to eliminate Yang Xiao before being defeated alongside Zheng. 271 272 337
• Tianya — Akatsuki Organization recruit with Dual Quirks. Yang Xiao accepts him after witnessing Tianya Zhichi’s ability to strike distant, obstructed targets. 227 228
• Edgyshot — Yang Xiao’s Workplace Experience supervisor, who praises his potential and warns him to stay away from the agency after the Hei Mu Village incident. 178

Story Role / Major Arcs

Early Training and Problem Solver

Yang Xiao trains at Seaside Park to prepare for U.A. while supporting himself with part-time work. He joins the Problem Solver’s core operations and coordinates missions before becoming a frontline operative. 2 3 41 68

Zheng Yingshan’s Attack and Recovery

Zheng Yingshan cripples Yang Xiao’s Nether Point with Death God’s Eye, leaving him close to death. Qiao Nansan treats the injury, and Shinpachi’s training enables Yang Xiao to regain his peak condition and enter the Sixth King Realm. 56 60 63

U.A. Sports Festival

Yang Xiao returns to U.A. after his disappearance, gaining public attention as the student who survived the USJ Incident. He defeats Shinso Hitoshi with one punch, overcomes Katsuki Bakugo and Shoto Todoroki, and wins the Sports Festival championship. 100 142 143 149 153

Blue Moon Demonic Blade and Quirk Mutation

During his Workplace Experience, Yang Xiao infiltrates Hei Mu Village and takes the Blue Moon Demonic Blade. Its darkness fuses with his Holy Light, creating Light-Dark Power and forcing him to conceal his mutation from U.A. and the Problem Solver. 174 175 178

Underground City and Akatsuki Organization

Using the identities Flash and Payne, Yang Xiao rises rapidly through the Underground City ranks. He builds the Akatsuki Organization to unite strong fighters against the forces controlling and suppressing Gold Rank combatants. 179 181 187 227 228

Interworld Journey and Giant World

The dagger transports Yang Xiao to Qi Feng’s world, where the two form an alliance based on mutual assistance. Later, Qi Feng protects Yang Xiao while he absorbs the Supreme’s Immortal Water and reaches LV10. 199 203 205 326 327

Darkest Era and Final Battle

Yang Xiao returns to find the Darkest Era has begun three years early and the Island Nation has fallen under Zheng Yingshan and Han Guang. After reuniting with the Problem Solver and U.A. survivors, he confronts the two rulers in Tokyo, reveals his identities as Flash and Payne, and defeats both as the Justice Punisher. 330 331 336 337

Notable Quotes

“Treat me with respect, and I'll return it tenfold. Push me an inch, and I'll trample you a mile.” 3

“If you can get stronger, can't I?” 272

“From now on, I am the Supreme!” 327

Trivia

• Yang Xiao intentionally keeps a scar left by an earlier injury rather than removing it. 95
• He originally planned to inherit Edgyshot’s agency, but later decides to establish an agency of his own. 179
• His identities as Flash and Payne are publicly revealed during the final battle; he also hints that he has a third identity. 336