Mei

Biodata

Feature	Value
Name	Raiden Mei
Alias(es)	Herrscher of Thunder; former Third Herrscher
Species/Race	Human; Herrscher
Gender	Female
Affiliation	MOTH; later World Serpent; later Schicksal
Occupation/Role	MOTH Research and Development Department head; battlefield commander; combatant and squad captain
Status	Active
First Appearance	I Am Not a Hero, Chapter 1

Power Progression

Stage / Realm / Level	Chapter	Notes
Herrscher of Thunder	1	Appears with horns and the status of a potential Herrscher; her identity is connected to the Third Herrscher previously defeated by Lin.
Tactical commander	16–17	Rapidly processes Honkai data, calculates Changkong City's Honkai Energy distribution, and assumes on-site command against the Third Herrscher.
Complete Herrscher of Thunder	59, 76	Uses the Authority of Thunder, including horns, an armored giant arm, lightning movement, and Kurikara's dragon form. Her Herrscher Core and Honkai Energy are temporarily lost in Chapter 59 before later returning.
Imprint-enhanced Herrscher	104	Uses the Mobius imprint to temporarily suppress Phoenix during her battle with “Lin.”
Highest Authority bearer	709, 725	Gains access to the Imaginary Tree's highest authority through Lin's imprint; the Nameless Engraving becomes the apparent target of her abduction.
Origin/Thunder hybrid state	757	Identifies herself as neither wholly the Herrscher of Origin nor wholly the Herrscher of Thunder, prioritizing power sufficient to aid Kiana and Lin.

Background / History

Mei was initially a student at Chienyu Academy and one of the few people close to Lin and Kevin. Her status as a potential Herrscher made her hostile toward Lin when they first met, though their relationship gradually became one of mutual trust. 1 17

During the Third Honkai War in Changkong City, Mei was recruited into MOTH after passing Doctor Mobius's assessment. She quickly proved herself capable of analyzing Honkai phenomena and directing personnel under battlefield conditions. 12 16 17

Mei eventually became head of MOTH's Research and Development Department. Her work included designing weapons, studying Herrscher Cores, developing Soul Steel, and pursuing the integration of higher-class Honkai Beast material into human bodies as an alternative to directly using Herrscher Cores. 35 120 174

While investigating the Imaginary Tree and Lin's past, Mei repeatedly faced simulations, memory fragments, projections, and alternate versions of Lin. Her continued search for answers led her to receive Lin's imprint and gain access to the Tree's highest authority. 38 102 709

In the current era, Mei joins World Serpent to protect Kiana, later pursues Kiana through Sky City, and works alongside Anti-Entropy and Schicksal personnel. After the Great Honkai, she remains on the front lines and serves as a captain in the reorganized Schicksal forces. 656 613 779

Appearance

Mei is a purple-haired woman with light-purple eyes and a composed, striking appearance. In Sky City, she wears a white dress, blue-and-white coat, black stockings, and carries a long sword. 613

• Her Herrscher transformation manifests horns on her forehead. 1 59
• She can summon a giant armored arm while using the Authority of Thunder. 38 59
• Her Herrscher form is accompanied by lightning, altered attire, and a more overtly intimidating presence. 676 724

Personality

Mei is reserved, composed, and intensely analytical. She processes information with exceptional speed and habitually approaches problems through collection, organization, simplification, and absorption of data. 16

Beneath her calm exterior, Mei is willing to make radical decisions for humanity's survival. She accepts the possibility of sacrifice during the Third Honkai War and later pursues dangerous research involving Honkai Beast integration. 16 35

She is also persistent in seeking the truth, particularly regarding Lin, the Imaginary Tree, and MOTH's hidden history. Even when faced with manipulation, incomplete answers, or overwhelming opponents, Mei continues investigating rather than accepting convenient explanations. 102 116 214 275

Abilities & Skills

Authority of Thunder

As the Herrscher of Thunder, Mei commands lightning and Honkai Energy in combat.

• Generates large-scale electrical fields and lightning attacks. 38 421
• Moves as a streak of lightning for rapid repositioning. 59
• Can summon a giant armored arm to wield a massive sword. 38 59
• Uses Kurikara's dragon form, capable of causing city-scale destruction. 76
• Can expend substantial Honkai Energy to break restraints that suppress her power. 421
• Her Herrscher Core and Honkai Energy can be removed or suppressed under unusual circumstances. 59 421

Swordsmanship

Mei is a master swordswoman and successor of the Hokushin Itto-ryu. 613

• Uses a long sword and the Raikiri blade in close combat. 613
• Identifies sword schools and combat techniques through an opponent's movements. 420
• Combines swordplay with lightning-based attacks and Herrscher abilities. 76 481
• Defeats Lin in a duel by using a technique learned from him. 78

Tactical Analysis and Command

Mei possesses extraordinary information-processing ability and battlefield judgment.

• Calculates Honkai Energy distribution across Changkong City shortly after learning of the Honkai. 16
• Gives operational instructions precise to microsecond-level timing. 17
• Commands Titans and coordinates rescue operations during MOTH crises. 131 149
• Assesses enemy patterns and changing Herrscher behavior during the Tenth Honkai War. 466
• Develops research and military strategies involving Herrscher Cores, Divine Keys, and Honkai Beast genes. 35 246 474

Imaginary Tree Authority

Mei gains access to authority within the Imaginary Tree through Lin's imprint.

• Receives an imprint from Lin after defeating him. 78
• Uses the imprint of Infinite to influence or suppress Divine Key power during a confrontation with “Lin.” 104
• Gains access to the Tree's highest authority, making her Nameless Engraving a major target. 709 725

Equipment / Weapons / Items

• Raikiri — Mei's long sword, used during her confrontation with Rita in Sky City. 613
• Titan model — A detailed miniature Titan made by Vill-V and given to Mei by Lin. 56
• Prometheus Unit 2 — An AI system Mei uses for surveillance, data consolidation, Titan control, and internal investigations. 72 120 131
• Aponia's cross pendant — Given to Mei by Cosmos before she enters The Deepest Place. 214

Relationships

• Lin Cong / Zero — Former classmate, fellow MOTH figure, and the central subject of Mei's investigation. They develop mutual trust, though Mei repeatedly challenges his secrecy and decisions. 17 76 116
• Kevin — Former schoolmate and trusted ally. Kevin agrees to support Mei's strategy during the Third Honkai War, and they later work together within MOTH. 16 17 120
• Kiana — Mei's closest emotional priority in the current era. Mei joins World Serpent and risks confrontation with hostile forces in order to protect and find her. 656 613 622
• Elysia — An enigmatic guide and frequent source of information about Lin and the Imaginary Tree. Mei remains wary of Elysia's teasing manner and hidden motives. 1 76 483
• Doctor Mobius — Mei's evaluator, research associate, and adversarial source of information. Mei defeats Mobius to force her cooperation regarding the Imaginary Tree and Flame-Chasers. 12 35 116
• Vill-V — Fellow MOTH researcher and weapons developer. Mei asks Vill-V to develop large-scale anti-Honkai weaponry and redesign the Fifth Divine Key. 421
• Sakura — MOTH subordinate recruited by Mei after the lake incident; Mei becomes Sakura's superior. 103
• Rita Rossweisse — A tense temporary ally in Sky City. Mei agrees to help Rita retrieve an antidote in exchange for information on Kiana. 613

Story Role / Major Arcs

Third Honkai War

Mei is recruited by MOTH, analyzes the Changkong City crisis, and takes command responsibility during the battle against the Third Herrscher. Her decisions force Kevin to confront whether he can trust her willingness to sacrifice Lin for victory. 12 16 17

MOTH Research Leadership

As R&D Department head, Mei directs advanced Honkai research and weapons development. She considers using Herrscher Cores as weapons and supports projects involving Honkai Beast integration, Soul Steel, Titans, and Divine Keys. 35 120 174 246

Imaginary Tree Investigation

Mei enters the Imaginary Tree to uncover Lin's history and the truth behind MOTH. She faces corrupted spaces, artificial opponents, “Lin” projections, and concealed memories while being tested for recognition by the Tree's inhabitants. 38 76 102 297

Search for Kiana

After becoming the Herrscher of Thunder again, Mei leaves Changkong City to seek Kiana. In Sky City, she bargains with Rita, infiltrates Shencheng Pharmaceuticals, and continues pursuing Kiana after her abduction. 656 613 622

Conflict with the Herrscher of Erosion

Mei confronts the Elysia-like Herrscher of Erosion and versions of Lin influenced by corrupted Imaginary Tree data. She learns that the Herrscher seeks the highest authority carried by her Nameless Engraving. 480 707 709 725

Post-Great Honkai Service

Following the Great Honkai, Mei remains a front-line combatant and becomes a Schicksal squad captain, continuing to protect others through the use of her sword. 779 780

Notable Quotes

“I am willing.” 16

“Information processing is just a matter of collection, organization, simplification, and absorption.” 16

“If this is your test, then you underestimate me, Lin.” 299