Esther Rosenthal, the 23rd head of the Rosenthal Family, commands necromantic arts honed over four centuries to forge a golem possessing both divine soul and form. Merging Kabbalistic golemcraft with Taoist principles, her lineage implants artificial souls into corpses, transforming them into sentient servants. Residual echoes of the deceased act as ciphers, channeled through inscribed paper charms and elaborate magic circles to animate and command these reanimated forms. Raised amidst these ancient practices, Esther once pursued her family’s legacy without grasping the gravity of life and death. Five years before the central conflict, deception drew her into Hishigata Mikihiko’s Academy City research team. Her expertise fueled the creation of experimental "Coffins"—devices amplifying esper powers through corpse integration. There, she formed a bond with Hishigata’s sister, Hirumi. When Hirumi perished, Esther sought to resurrect her using Taowu, an artificial soul branded among the Rosenthal’s Evil Spirits of the Numbers. Unwittingly, she triggered Taowu’s latent scheme—a plot seeded by her ancestor Isaac and a self-styled demon to shatter life-death equilibrium by harvesting ten thousand mortal memories. Hirumi’s irreversible demise and Taowu’s treachery shattered Esther’s allegiance to her family’s quest. Confronting the moral toll of necromantic manipulation—especially as Hishigata and the shadowy DA repurposed her craft as weapons—she fled captivity. Her path converged with Last Order, whose link to the Misaka Network marked her as crucial to thwarting Taowu’s design. This pursuit forged an alliance with Accelerator, whose formidable prowess earned her unwavering respect and the title of "teacher." Esther’s striking features—blonde hair, emerald eyes, and a distinctive mole beneath her left eye—match her eclectic wardrobe: a black cloak draped over a sleeveless white blouse, crimson skirt, thigh-high socks, and leg-bound leather straps. Following combat damage, she briefly adopted a nurse’s uniform before shrouding Hitokawa Hasami’s reanimated corpse—animated through the Huotou soul—with her signature cloak. The Necromancer Arc introduces Esther mid-flight from DA agents, crossing paths with Accelerator. She unveils her craft by resurrecting Hasami’s corpse as a combatant against their pursuers. Polite yet socially detached, she puzzles over modesty conventions while marveling at mundane wonders like family restaurants. Spin-offs like *Toaru Idol no Accelerator-sama* showcase Esther’s comedic devotion to Accelerator as his self-proclaimed idol, while *Imaginary Fest* tasks her with probing urban legends of the resurrected dead—each narrative preserving her essence through varied tonal lenses. Beyond corpse reanimation, Esther wields skills spanning spiritual circuit neutralization and non-necromantic incantations. Yet her methods court danger—disrupted rituals risk unleashing spectral chaos from unstable artificial souls. This fusion of technical precision and ethical quandaries charts her transformation from dynastic necromancer to a soul-searching practitioner weighing her art’s consequences.