Sherry Cromwell serves as a highly skilled decoder for Necessarius, the Anglican Church's 0th Parish. Her expertise lies in deciphering grimoire codes concealed within paintings, analyzing pigment, thickness, and thematic elements to interpret or seal dangerous knowledge. This mastery earned her the Royal Academy of Arts' highest honors, leading British museums and St. George's Cathedral to regularly request her artistic restoration and identification services. Twenty years before the main events, Sherry participated in a clandestine magician-esper hybrid experiment. There, she befriended the young esper Ellis Warrior and taught him magic. The project ended catastrophically when Ellis suffered fatal injuries from magic-AIM field incompatibility. Knights of England, dispatched by Anglican superiors to erase all evidence of science-magic collaboration, killed Ellis as he shielded Sherry during the assault. This trauma cemented her conviction to prevent future tragedies by enforcing strict isolation between magic and science. Sherry appears approximately 25 years old, with dark skin, unkempt blonde hair resembling a lion's mane, and blue eyes. In public, she typically wears a tattered black Gothic Lolita dress with yellowish lace. At the Anglican Church Women's Dormitory, she favors casual attire like a light double negligee, reflecting her apathetic and lazy approach to daily routines. Her primary hobby is sculpting, an activity demanding such intense focus she neglects basic needs like breakfast; she frequently crafts statues of Ellis. Her personality is brusque and defined by conflicted motivations. Sherry self-describes as having "as many convictions as there are stars," driven primarily by vengeance for Ellis while paradoxically reluctant to harm others. This internal struggle fuels her desire to provoke conflict between science and magic factions—intending to force mutual isolation—while secretly hoping someone would stop her plans. She speaks in a distinctively heavy, androgynous voice and habitually assigns nicknames to colleagues, calling Kaori Kanzaki "Far East girl" and referring to Lucia and Angelene as "Nun 1" and "Nun 2." Despite this, she shares a genuine friendship with Orsola Aquinas, often snapping her out of oafishness during critical moments. Sherry's magic utilizes Kabbalah adapted with Anglican elements and English linguistic systems. Her primary ability manifests a 4-meter-tall golem named Ellis, constructed from surrounding materials like concrete or metal. The golem incorporates a cross-shaped design symbolizing the four archangels and features a core whose destruction deactivates it. Sherry controls Ellis remotely via pastel chalk, sensing through its senses or setting autonomous mode (which forfeits her control). Ellis regenerates by assimilating nearby materials every three seconds, a process failing if harmful or incompatible substances are introduced. Secondary abilities include: - Creating multiple mud eyeballs for surveillance and communication, capable of phasing through solid objects. - Collapsing structures like floors or pillars by drawing additional golem magic circles while Ellis is active. - Levitating slightly off the ground to absorb physical impacts and avoid tremors from Ellis’s movements. - Using automatic writing to uncover unknown information, such as identifying Hyouka Kazakiri as a target. Her chronology begins in the Kazakiri Hyouka Arc, where Aleister Crowley manipulates her into invading Academy City to instigate a science-magic war. She breaches the city, injuring 15 people and critically wounding three, battling Shirai Kuroko and Misaka Mikoto before escaping. Using automatic writing, she identifies Hyouka—the "Key to the Imaginary Number District"—as her target to destabilize Academy City. Sherry confronts Hyouka, deeming her a "monster" akin to Ellis, and attacks with the golem. Kamijou Touma and Anti-Skill forces ultimately defeat her by exploiting Ellis’s regenerative weakness with foreign debris. Captured and repatriated to England, she faces temporary house arrest but continues indispensable decoding work for Necessarius. Following her defeat, Sherry provides analytical support for Necessarius operatives during missions. She later participates in the British Civil War, combating Carissa’s forces alongside other Anglican magicians, shifting from antagonist to ally while retaining her central decoding role.