Sherry Cromwell serves as a magician within the Anglican Church’s Necessarius, operating under the clandestine 0th Parish as a masterful decoder who harnesses Kabbalistic principles to craft golems and arcane constructs. Her striking appearance features an unkempt blond mane framing brown skin, perpetually clad in a tattered gothic black dress edged in yellowish lace—a garment worn daily, not reserved for ceremonies. During respites at the Anglican Church Women’s Dormitory, she dons a lightweight double negligee. Two decades before the central narrative, her psyche was permanently scarred by a clandestine Anglican project attempting to fuse magic and science through a magician-esper hybrid. She bonded with esper Ellis Warrior, instructing him in magical arts until the experiment collapsed under clashing energies, fatally wounding Ellis. Knights of England razed the facility, with Ellis perishing while shielding her during escape. This tragedy forged her distrust of magic-science collaboration and an obsessive drive to avert similar catastrophes. Her motivations churn with inner turmoil, wavering between vengeful impulses against science and a refusal to inflict harm. She claims to possess "as many convictions as stars," reflecting fluid priorities. Though brusque, her distinctive voice blends masculine and feminine tones, evoking a smoke-roughened singer’s timbre. Despite this, she exhibits penetrating insight, such as prodding Orsola Aquinas toward clarity during pivotal negotiations. Leisure hours see her carving Ellis’s likeness in stone or indulging in prolonged slumber, often skipping meals during artistic fervor. In the Kazakiri Hyouka arc, Aleister Crowley manipulates her into assaulting Academy City to ignite conflict between magical and scientific factions. Deploying her golem Ellis—a towering amalgam of concrete and steel named for her fallen friend—she storms the city, wounding numerous combatants and clashing with Shirai Kuroko, Misaka Mikoto, and Kamijou Touma. While Ellis boasts self-repairing resilience, Sherry remains physically exposed. Targeting Kazakiri Hyouka as an artificial entity akin to Ellis, she reconsiders after confronting Hyouka’s human essence and Touma’s defiant resolve, prompting her to reassess her crusade. Academically, she holds authority on emblem restoration, occupying a coveted chair at the Royal Academy of Arts. Institutions like the British Museum and St. George’s Cathedral summon her expertise, while she juggles academic rigor with covert operations for Necessarius. Post-conflict, she transitions from adversary to reluctant collaborator, supporting Touma in later struggles—a shift underscoring her multifaceted ethics and enduring psychological scars as she pursues atonement.