Helena Blavatsky, known as Madame Blavatsky, emerges as a 19th-century occultist and theosophy founder, renowned for her eccentricity and relentless intellectual pursuits. A prodigious magus born with unique Magic Circuits, she defied aristocratic expectations by abandoning a marital alliance to pursue mysticism. Her life’s work revolved around uncovering “Mahatma”—a term she ascribed to higher beings she claimed to commune with, though contemporaries often dismissed these assertions as fantastical. Historically, she staged her 1891 death to escape the Mage’s Association’s pursuit of a Sealing Designation, subsequently journeying through the Himalayas with Sherlock Holmes. There, they witnessed an enigmatic luminous phenomenon she deemed a transcendent force tied to her esoteric beliefs. As a Servant, her visage remains deceptively youthful, maintained by magecraft that contrasts her public facade as an elderly woman in life. Interacting with fellow Servants, she oscillates between mischievous interference and maternal guidance, frequently mediating disputes. Her rapport with inventors like Thomas Edison and Nikola Tesla blends camaraderie with exasperation over their ceaseless rivalry. A nuanced bond lingers with Holmes, marked by cryptic references to their shared past—using aliases like “Sigerson”—and exchanges laced with wit. Combat-wise, she excels in empowering allies through Noble Phantasm acceleration, card efficiency enhancements, and critical star generation, though her skills demand strategic timing due to prolonged cooldowns. Her Noble Phantasm, *Sanat Kumara*, unleashes Arts-based area damage alongside debuffs, gaining defense-ignoring potency after an Interlude upgrade. In *Fate/Grand Carnival*, she manifests as a Rider-class anomaly, deviating from her standard Caster or Archer roles. Though adapted to the series’ humor, her core identity persists: a whimsical polymath mediating conflicts, invoking “Mahatma” as her spiritual compass, and venerating India as her metaphysical anchor. Her essence thrives on paradox—a self-styled “eternal magical girl” wielding razor-sharp intellect, a heretic dismissed despite seeking hidden truths, and a nurturing mentor veiling solitude. These contradictions mirror her historical mystique, reimagined through the Nasuverse as a visionary shrouded in enigma.