Mei

Biodata

Feature	Value
Name	Raiden Mei (芽衣)
Alias(es)	Queen Raiden; Herrscher of Thunder; Origin Herrscher
Gender	Female
Affiliation	St. Freya Academy; Anti-Entropy; formerly World Serpent
Occupation/Role	Valkyrie; Herrscher
Status	Alive
First Appearance	Chapter 149

Power Progression

Stage / Realm / Level	Chapter	Notes
Herrscher of Thunder manifestation	150	Her Stigmata Will takes control after Kiana is injured, destroying a Temple-class Honkai Beast. Her energy output is measured at 3896 HW, and she manifests lightning wings and an electromagnetic shield. 150
Limited access to Thunder Authority	162	A suppression device near her heart activates after sustained high Honkai Energy output, leaving her unable to use Herrscher Authority until Lena rescues her. 162
Cooperative use with Stigmata Will	210	Rather than taking over, her second personality helps Mei adapt to the Herrscher's power, allowing her to clear a Honkai Beast horde with chained lightning. 210
Freely usable Thunder Authority	287	By the time she enters the Imaginary Tree, her second personality generally permits Mei to use the Herrscher of Thunder's power whenever needed. 287
Qualification for Herrscher of Origin	380	The twelve Flame-Chasers support Mei's transformation into the True Self—Herrscher of the Human—and the Key of Origin appears. 380
Herrscher of Origin	383	Mei fuses the Origin Herrscher's Authority with her own Authority, completing Elysia's inheritance. 383

Background / History

Raiden Mei was born in Changkong City, Honshu Island, on April 13, 1997, to Raiden Ryoma and an unnamed mother. Her mother died of cancer in 1999. Mei was kidnapped by terrorists in 2004 and spent years recuperating from the resulting psychological trauma. After Ryoma's 2013 arrest for alleged economic fraud, she was kidnapped again and released days later under unclear circumstances. 155

At Chiyou Academy, Mei met Kiana Kaslana. During the Changkong City Honkai outbreak, Kiana fought beside her as Mei's hidden Stigmata Will emerged and the Herrscher of Thunder's power began leaking from their shared body. The second personality feared that her existence would harm Mei and those around them, but Kiana repeatedly tried to save her rather than destroy her. 163

When Kiana was severely injured in Changkong City, Mei unleashed overwhelming lightning power. She destroyed a Temple-class Honkai Beast, withstood Hyperion bombardment behind an electromagnetic shield, and fought Murata Himeko until Enoshia intervened. 150 151

Afterward, Mei accepted responsibility for the Judgment-class Honkai Beast born alongside her. With Enoshia's and Sirin's assistance, she created a Quasi-Herrscher Core for it, enabled its human form, and named it Lena. 164

Mei later joined World Serpent while pursuing ways to save Kiana. Her journeys through the Imaginary Tree exposed her to the Previous Civilization and the stories of the Flame-Chasers, ultimately leading her to inherit Elysia's Origin Authority. After confronting Kevin's ideals, Mei left World Serpent with his permission. 287 383 386

Appearance

Mei is a 172 cm-tall young woman. In ordinary settings, she wears the Chiyou Academy uniform or Valkyrie combat gear; in battle, she fights with a katana and is often accompanied by purple lightning. 155 183 317

• Her Herrscher manifestation produces asymmetric lightning wings behind her. 150
• She has worn the Valkyrie: Striker battlesuit. 183 317
• The Key of Origin changes from a bow into a katana when held by her. 384

Personality

Mei is observant and analytical, frequently drawing conclusions from incomplete information. She identifies false environments, studies Honkai-related history, and recognizes the risks of using Herrscher power recklessly. 239 315 317

Her decisions are strongly shaped by her devotion to Kiana. Mei repeatedly prioritizes Kiana's safety over her own, whether accepting Enoshia's conditions, refusing to cause collateral damage in Tianqiong City, or continuing to seek Kiana despite separation. 151 228 230

She is compassionate but not passive. Mei takes responsibility for Lena rather than abandoning a being born from her power, and she eventually rejects Kevin's demand that everyone conform to his chosen definition of heroism. 164 386

Abilities & Skills

Herrscher of Thunder Authority

Mei's primary Herrscher Authority controls lightning and can decompose matter into atoms. Her power is closely intertwined with her Stigmata Will, who initially wielded it more effectively than Mei herself. 179 273

• Produces concentrated lightning spheres, beams, and widespread electrical barrages. 150
• Generates an electromagnetic shield capable of withstanding Hyperion cannon fire. 150
• Chains lightning through groups of Honkai Beasts, rapidly clearing large formations. 210
• Allows extreme speed, enabling Mei to outrun pursuing Valkyries. 228
• Can be used with restraint to avoid an electromagnetic pulse that would disable nearby equipment. 200
• Was initially limited by a suppression device installed near her heart. 162
• Can be disrupted when an enemy forces foreign Honkai Energy into her internal energy pathways. 210

Stigmata Will

Mei shares her body with a second personality born from her Stigmata. The personality originally acted as her apparent “Herrscher personality,” because Mei's main personality resisted using the Herrscher's power. 151

• Possesses greater early mastery of the Herrscher of Thunder's Authority. 273
• Can take control in emergencies, though it later assists Mei without fully taking over. 200 210
• Maintains a protective attachment to Kiana and agrees with Mei at critical moments concerning her safety. 210 273
• Its existence initially caused uncontrolled power leakage, atomization of touched objects, and infection of nearby people. 163

Herrscher of Origin Authority

After completing the Imaginary Tree trials, Mei inherits and fuses the Origin Herrscher's Authority with her Thunder Authority. 383

• Connects any of the twelve Herrschers. 384
• Enhances connected Herrschers to a certain degree. 384
• Is tied to Elysia's legacy of inspiring and guiding others. 383

Data-Space Combat

During her confrontation with the Imaginary Tree's Herrscher of Corruption, Mei learns to damage the unstable data space itself.

• Creates rifts in data space with lightning-based sword strikes. 371
• Uses knowledge of the Flame-Chasers' fighting styles to defeat corrupted manifestations of their powers. 368
• Cannot overcome the Herrscher of Corruption through raw force alone while exhausted or outnumbered. 368 371

Valkyrie Combat

Mei is an accomplished close-range combatant, combining katana technique with lightning.

• Defeated a Valkyrie-exam opponent in under a minute while wearing the Striker battlesuit. 183
• Uses deliberate output control when fighting near civilian infrastructure or sensitive equipment. 200 228
• Can fight effectively even in simulated Previous Civilization scenarios where her Authority is unavailable or restricted. 322

Equipment / Weapons / Items

• Katana — Mei's standard close-combat weapon; she channels lightning through it. 183 210
• Seven Thunders of Retribution — a katana used during her Imaginary Tree battles. 368
• Key of Origin: Flawless Companion — a bow containing the Origin Core that transforms into a katana for Mei. 380 384
• Valkyrie: Striker battlesuit — Valkyrie armor associated with Mei's combat training and Imaginary Tree identities. 183 317

Relationships

• Kiana Kaslana — Mei's closest companion and lover. Kiana's safety is Mei's foremost priority, and Mei initiates a kiss that marks the deepening of their relationship. 150 178 428
• Raiden Mei's Stigmata Will — Mei's second personality and early wielder of the Herrscher of Thunder's power; their relationship develops from conflict into cooperation. 151 210 273
• Lena — Mei's Judgment-class Honkai Beast familiar. Mei names Lena, accepts responsibility for her, and treats her as a companion. 164
• Enoshia — A Herrscher ally and guide who helps Mei handle Lena, navigate the Imaginary Tree, and pursue the Origin inheritance. 164 313 380
• Elysia — Mei's guide and predecessor in the Origin inheritance. Elysia's legacy and Mei's wish to meet her again enable Mei to inherit the Origin Authority. 380 383
• Raiden Ryoma — Mei's father and the former head of ME Company. His arrest profoundly affected Mei's life at Chiyou Academy. 155 381
• Kevin — Mei's former World Serpent leader. She understands his reasons but rejects his vision and leaves the organization with his authorization. 386
• Bronya Zaychik — Mei's fellow St. Freya student and ally, who supports her after Kiana's capture and reunites with her later in the Sea of Quanta. 204 399
• Theresa Apocalypse — Mei's ally during the pursuit of the Herrscher of Ice. 210

Story Role / Major Arcs

Changkong City Outbreak

Mei is caught in the Changkong City disaster alongside Kiana and Bronya. Kiana protects her as they escape Zombies and Honkai Beasts, while Mei's Stigmata Will and Herrscher power become increasingly central to the crisis. 149 163

Herrscher of Thunder Awakening

Kiana's injury triggers Mei's catastrophic lightning manifestation. Her power draws the attention of Schicksal, Anti-Entropy, Enoshia, and Himeko, while exposing her exceptional compatibility with the Herrscher of Thunder Core. 150 151

Lena's Birth

After the suppression device nearly leaves Mei helpless against a Welt Joyce clone, Lena rescues her. Mei subsequently chooses to keep the beast as her familiar and helps give Lena a human identity. 162 164

Rescue of Kiana

Mei participates in efforts to rescue Kiana from Otto and later searches Tianqiong City for her. Although she realizes Kiana is nearby, Mei respects Kiana's decision not to reunite until she can safely control her own Honkai Energy. 204 228 230

Imaginary Tree Exploration

Mei enters the Imaginary Tree and experiences nodes based on the Previous Civilization. She meets the Flame-Chasers, investigates the history of past Honkai outbreaks, and repeatedly confronts questions about identity, sacrifice, and what it means to be a Herrscher. 287 313 319 354

Origin Inheritance

Following the Flame-Chasers' support and Elysia's trials, Mei faces her Stigmata Will, accepts her past, and becomes the Herrscher of Origin. 380 381 382 383

Departure from World Serpent

Mei confronts Kevin over the Stigmata Project and rejects his attempt to impose heroism on everyone else. Kevin permits her to leave World Serpent. 386

Finality

Mei reunites with Kiana and joins Kiana and Bronya in the conflict surrounding the Cocoon of the End and Kevin. She supports Kiana's ascension to Herrscher of Finality and fights beside the other Herrschers against Asura Kevin. 399 428 432

Trivia

• Mei's early Herrscher manifestation was powerful enough that the Hyperion recorded an output of 3896 HW. 150
• Enoshia identifies Mei as an especially suitable candidate for handling the Imaginary Tree because of her way of thinking and ability to manage complex situations. 238
• Before becoming a Valkyrie and Herrscher, Mei expected to inherit ME Company. 314
• Mei's Origin Authority allows connected Herrschers to receive a degree of enhancement. 384