Bai Xiaoxiao

Biodata

Power Progression

Background / History

Bai Xiaoxiao is the youngest of Mo Chou and Bai Qiushi’s five children. Unlike their three eldest children, who were adopted, she and Mo Xiaochuan are their biological children. She is two years younger than Mo Zhen and bears her mother’s surname because Mo Chou insisted that daughters follow that hometown tradition 4.

An unidentified S-rank criminal killed Bai Qiushi two years before the main story. Afterward, Mo Chou, Mo Jin'an, and Bai Zhixia disappeared for three months, leaving fourteen-year-old Mo Zhen to care for Xiaoxiao and Xiaochuan. Xiaoxiao struggled to accept her mother’s death, withdrew from school, and repeatedly attempted suicide 6 11.

Her relationship with Mo Zhen fractured after an exhausted argument. She accused him of not caring because he had not cried at their mother’s funeral and told him she hated him. They subsequently spoke so rarely that they passed messages through Mo Xiaochuan 6.

After returning to school, Xiaoxiao remained isolated and regretted her words, but feared Mo Zhen would reject a belated apology. At an unfinished building associated with happier family memories, a witch exploited her suicidal thoughts and pushed her from the rooftop. Nightingale rescued her; when another creature attacked Nightingale, Xiaoxiao awakened as a magical girl to protect her 18.

Appearance

• Build: Petite, standing approximately 152 centimeters tall 67.
• Hair and eyes: Shoulder-length gray-white hair and dark crimson eyes, both inherited from Bai Qiushi 4.
• School clothing: A blue-and-white sailor uniform 6.
• Magical-girl outfit: A pure white Gothic dress, accompanied by a matching white staff 5.
• Accessory: A black ribbon in her hair 76.

Personality

Xiaoxiao is guarded about affection and often denies being worried even when her behavior makes it obvious. She struggles to initiate reconciliation with Mo Zhen, repeatedly rewriting messages without sending them. Nevertheless, she stays awake awaiting his return and worries about the possible consequences of his Compound Nine injection 9 18 19.

Her initial fear in combat does not prevent her from trying to protect others. During her first mission, she warns an unfamiliar girl to flee from the familiar pursuing her. She also defends Hell against criticism and stands up for Tang Xiaoyu when classmates harass her 5 7 31 73.

Her attachment to Mo Zhen has a possessive side. She becomes intensely jealous when he smiles with other girls and hopes that growing stronger will make him depend on her. His unexpected strength therefore unsettles her: she is glad he can protect himself, but fears losing the role she imagined having in his life. She recognizes that wanting him entirely to herself is wrong, yet struggles to stop thinking that way 66 67 76.

Abilities & Skills

Cold July Sky

Her innate Magic Cursed Technique controls low temperatures and water vapor 23.

• Ice Arrow: Fires an ice projectile that bursts on impact and creates a semicircular frozen area 23.
• Protective freezing: Her first instinctive use freezes the shadowy arms reaching for Nightingale, allowing Nightingale to shatter them 18.
• Initial limitation: Conflict between her Viltrumite power and Cursed Technique Engraving prevents consistent activation until Hell stabilizes them 23.

Magical-Girl Transformation

Xiaoxiao releases her magic with “Heavenly Light, release!”, assuming her Morning Star identity 5.

• Her magical outfit includes a perception filter; when her transformation is forcibly undone, Hell recognizes her civilian identity 6.
• In her early battles, she can only hurl raw magic, which injures but cannot kill the giant baby familiar pursuing her 5.
• A normally fatal injury while transformed can force her back into civilian form without leaving the injury. Following Hell’s attack, she cannot transform again for twenty-four hours 5 6.

Meteor Magic

A long-distance flight spell that sends magical girls across the sky like shooting stars 22.

• She initially struggles with landing and precise control 22.
• She later uses it to travel through a downpour to the aquarium Witch Barrier 47.

Viltrumite Heritage

Xiaoxiao possesses the same inherited source of power associated with Mo Chou and Mo Xiaochuan 23 63.

• Hell’s treatment brings her inherited power and magical technique into reconciliation, allowing them to begin merging 23.
• Magical stimulation accelerates the bloodline’s awakening, but her recorded panel does not yet identify a completed awakening or specific Viltrumite abilities 63.

Equipment & Companions

• Pure white staff — Her magical weapon and the focus she uses when casting Ice Arrow 5 23.
• Soul Gem — She reaches for it when the light rail comes under attack 67.
• White dove companion spirit — Warns her about familiars, communicates telepathically, and consults an internal library while investigating Hell’s identity 5.

Relationships

• Mo Zhen — Adoptive older brother and the focus of her desire to repair the past. Sharing a chocolate cake marks a significant thaw in their estrangement. He views her as a younger sister needing care, while her attachment becomes increasingly possessive 19 67.
• Hell — Rescuer, instructor, and someone she openly admits liking. Xiaoxiao admires her despite their harsh first encounter and defends her online. She remains unaware that Hell is Mo Zhen 5 24 31.
• Saionji Kirika / Wuhua / Nightingale — Senior magical girl who saves her life, witnesses her awakening, and encourages her to reconcile with Mo Zhen. They train together and frequently stay at Wuhua’s home 11 18 22 53.
• Mo Xiaochuan — Biological older brother and an intermediary during her estrangement from Mo Zhen. They also bicker over games and his behavior 6 67 75.
• Bai Qiushi — Mother. Her death drives Xiaoxiao’s withdrawal, grief, and wish that the past could be undone 6 18.
• Mo Chou — Father. His prolonged grief initially leaves the children without dependable support; later, he resumes everyday parenting, including preparing breakfast and enforcing school attendance 6 10.
• Tang Xiaoyu — Friend and fellow magical girl. Xiaoxiao confronts classmates bullying her, comforts her afterward, and promises to call Mo Zhen if it happens again 73.
• Lin Xiaohong / Red Sparrow — Senior magical girl with whom she takes part in the aquarium operation and later faces threats from the Witches’ Association 47 56.

Story Role / Major Arcs

Notable Quotes

“I want none of it to have ever happened!”
— Her reason for becoming a magical girl 18.

“If only I could become a little stronger.”
“Then my brother could only stay by my side forever...”
— After discovering Mo Zhen no longer needs her protection 67.

Trivia

• She practiced ballet before quitting the school troupe after her mother’s death. This experience helps her recognize the version of The Nutcracker performed in the abandoned-school domain 6.
• She saves the tastiest part of a meal for last 9.
• Mo Zhen’s system initially displays her affection as “??” and later clarifies it as “?? (immeasurable)” 9 63.