Mei

Biodata

Feature	Value
Name	Raiden Mei (芽衣)
Alias(es)	Third Herrscher; Herrscher of Thunder; Hokushin Mei (name adopted by her Stigmata persona) 61
Gender	Female
Affiliation	St. Freya Academy; formerly Chiba Academy 20
Occupation/Role	Valkyrie trainee; host of the Herrscher of Thunder and a Stigmata persona
Status	Active
First Appearance	Mentioned in Changkong City 3; encountered at Chiba Academy 4

Power Progression

Stage / Realm / Level	Chapter	Notes
Herrscher of Thunder awakened	3–4	Her awakened authority causes the Honkai Beast incursions around Changkong City; she remains at Chiba Academy rather than deliberately destroying the city. 3 4
B-Rank Valkyrie	20	Assessed as a B-Rank Valkyrie after enrolling at St. Freya Academy. 20
Partial Herrscher control; at least A-Rank capability	95	Combines family swordsmanship with a limited portion of Herrscher power, surpassing B-Rank capability; Theresa defeats her with the Oath of Judah's Constraint Force. 95
S-Rank-comparable combat capability	108	Her continued training and control of Herrscher power are described as having reached a level comparable to an S-Rank Valkyrie. 108
Full Herrscher of Thunder release	199–200	Reaches an agreement with her Stigmata will and unleashes her full power to fight Schicksal's forces. 199 200

Background / History

Mei was born into the Raiden family as the daughter of Raiden Ryoma. When her Stigmata began awakening during childhood, its incomplete awakening left her critically ill. Ryoma obtained approval to implant the Gem of Conquest, suppressing the Stigmata's awakening long enough for eight-year-old Mei to survive. 59 134

Before the Third Honkai outbreak, Mei studied at Chiba Academy. Her noble upbringing left her surrounded by flattering classmates, but after Ryoma was imprisoned over an economic scandal, those classmates turned cold and she became withdrawn. She had trained in swordsmanship since childhood, including with the “Houm Swordsman.” 9 24

Cocolia's Honkai outbreak in Changkong City fully awakened Mei's Stigmata. A second consciousness was born from it, took on the burden of Herrscher authority, and identified itself as the Third Herrscher. While Mei herself was unconscious, this persona remained at Chiba Academy; her awakening alone caused the surrounding disaster, but she did not intentionally devastate the city. 3 9 10

Following the outbreak, Mei enrolled at St. Freya Academy with Kiana, Bronya, and Ming Yu. Initially afraid that her other self would harm people, she gradually began communicating with her after agreeing to seek its power to save Yuna from becoming a Pseudo-Herrscher. 20 24 25

Mei later joined Ming Yu and Bronya's Siberia operation to rescue her father. During the mission, she accepted her Herrscher identity as a source of strength that could protect others, infiltrated Cocolia's fortress, and reunited with Ryoma. 119 123 131

Appearance

Mei is a purple-haired girl usually seen with bright purple eyes. When her Stigmata persona controls their shared body, her eyes turn crimson and her demeanor becomes markedly more forceful. 12 25

• Purple hair, sometimes tied into a ponytail for training. 96
• Uses a katana as her preferred and consistently chosen weapon. 19 95
• Her appearance changes to that of a samurai girl while inside Yae Sakura's Stigmata Space. 58
• Herrscher power manifests through lightning, purple-blue Honkai energy, and gathering storm clouds. 95 129

Personality

Mei is gentle, considerate, and accustomed to caring for the people around her. She is also conscientious to a fault: after Changkong City's disaster, she fears her power and feels responsible for its victims, yet chooses to confront that fear when another life is at stake. 20 24

Her experiences following Ryoma's imprisonment made her more reserved, but life at St. Freya gives her genuine friends and allows her to become more open. She values family deeply, immediately committing herself to the mission once she learns her father is alive. 24 118 119

Mei's Stigmata persona is sharper, more combative, and readily calls Mei a coward. Despite her cold presentation and enjoyment of battle, she cooperates with Mei, wants friends, protects those close to her, and ultimately chooses the name “Hokushin Mei” to establish herself as a distinct individual. 24 25 55 61 129

Abilities & Skills

Hokushin Ittō-ryū Swordsmanship

Mei is a skilled katana wielder whose family sword style was trained from childhood and is specialized for fighting human opponents. 18 19

• Pressured Fu Hua during her St. Freya assessment, though she could not land a hit and was disarmed. 18 19
• Uses swordsmanship alongside lightning to increase the speed and force of her attacks. 18 95
• Her style becomes devastating against groups when reinforced by full Herrscher physical ability. 200

Herrscher of Thunder Authority

Mei's Stigmata persona bears the majority of the Herrscher of Thunder's authority, including lightning and electromagnetic-field manipulation. 9 10

• Summons and directs lightning with enough force to destroy Titan Mechas in single strikes. 129
• Forms blades from lightning and uses electromagnetic force for high-speed movement. 129
• Can create an electromagnetic barrier to protect allies, though it cannot stop non-physical mental attacks. 201
• Her power can summon dark clouds and create a favorable combat environment. 95
• The Staff of the Underworld can temporarily disrupt her connection to Imaginary Space and suppress her lightning and electromagnetic control. 129

Shared Consciousness

Mei and her Stigmata persona occupy the same body and can exchange control by agreement. 20 25

• Mei can seek the persona's help when greater power is needed, as she did to save Yuna. 24 25
• The persona can observe the outside world while remaining within Mei's consciousness. 24
• Their improved communication allows Mei to use her Herrscher identity without treating it solely as a threat. 131

Electromagnetic Perception and Communication

Mei can employ electromagnetic ability beyond direct attacks. 124 131

• Communicates directly with Ming Yu across distances without equipment. 124
• Assists in locating Cocolia's position for a long-range railgun strike. 131

Equipment / Weapons / Items

• Katana — Mei's primary weapon in both training and combat. 19 95
• Gem of Conquest — Implanted during childhood to suppress her Stigmata awakening and preserve her life; later connected to her Herrscher power. 134 136

Relationships

• Hokushin Mei / Stigmata persona — Her other self and co-holder of the Herrscher of Thunder's power. Their relationship grows from fear and hostility into cooperation. 20 24 25 131
• Ming Yu — Friend, ally, and later romantic partner. He encourages her to communicate with her other self, supports her through her identity crisis, and joins her in rescuing Ryoma. 20 119 131 135
• Raiden Ryoma — Her father. His decision to implant the Gem of Conquest saved her life; Mei later rescues him from Cocolia's Siberian fortress. 119 131 134
• Kiana Kaslana — St. Freya classmate and friend. Kiana defends Mei's efforts to control her Herrscher power. 20 108
• Bronya Zaychik — Teammate and friend. Mei shows concern for Bronya during their return to Siberia and works with her during the rescue operation. 123 129
• Fu Hua — Class representative, examiner, and senior Valkyrie who identifies Mei's rough Honkai-energy control and disarms her in training. 19 20
• Cocolia — Responsible for the Honkai outbreak that awakened Mei's Stigmata persona and for Ryoma's imprisonment. Both Mei and her other self are eager to oppose her. 10 123

Story Role / Major Arcs

Third Honkai Outbreak

Mei's awakening as the Third Herrscher drives the crisis in Changkong City. Her Stigmata persona resists the destruction expected of a Herrscher, remains at Chiba Academy, and eventually meets Ming Yu, Bronya, and Kiana. 3 4 9 12

St. Freya Academy

After joining St. Freya, Mei undergoes Valkyrie assessment and training. She learns that her ordinary sword skill is not enough without refined Honkai-energy control, then begins working toward mastering the power within her. 18 20 95

Yuna Rescue

Mei overcomes her fear of the Stigmata persona to request its power in an effort to save Yuna, a student on the brink of becoming a Pseudo-Herrscher. This becomes the first major step toward coexistence between the two Meis. 24 25

Siberia Rescue Operation

Upon learning that Ryoma is alive in Cocolia's Siberian fortress, Mei joins Ming Yu and Bronya. She serves as a hidden Herrscher force, destroys Titan Mechas, suffers temporary suppression from the Staff of the Underworld, and personally reunites with her father. 119 123 129 131

Acceptance of Herrscher Identity

After the rescue, Mei no longer sees herself only as a danger to others. She recognizes that her Herrscher power can be used to protect people and fight the Honkai, while continuing to work alongside her Stigmata counterpart. 131 136

Notable Quotes

“I want to borrow your power to help others.” 24

“Just call me Hokushin Mei.” 61

Trivia

• Mei's Stigmata persona chose “Hokushin Mei” because it preserves “Mei” as a connection while distinguishing her from Raiden Mei. 61
• Mei is an experienced cook and prepares meals for the group, including Higoyumaru's favored fried tofu pouches. 28 123
• In Yae Sakura's Stigmata Space, Mei recognizes that Far Eastern myths and yokai may be connected to Honkai-infected creatures. 58