Nemu Kurotsuchi is the artificial daughter and lieutenant of the 12th Division, serving under Captain Mayuri Kurotsuchi. she is the ultimate success of Mayuri's secret Nemuri Project, a bio-engineering initiative that utilized a groundbreaking hybrid of Gigai and Gikon soul technologies to construct a synthetic Soul Reaper from raw spiritual cells. Physically, Nemu appears as a tall, slender young woman with striking green eyes and long dark hair styled into a thick braid. She typically wears a modified, short-skirted Shinigami uniform paired with a white obi and long white gloves.Personality-wise, Nemu is defined by her profound stoicism, quiet demeanor, and unwavering obedience to Mayuri, a compliance forged through years of enduring his severe psychological and physical abuse. Despite her creator viewing her merely as an experimental tool and shield, she subtly possesses a gentle, compassionate core, which is first highlighted when she saves the Quincy Uryū Ishida by giving him an antidote during the Soul Society invasion. Because her body is completely synthetic, it functions as a highly durable, living chemical repository containing a vast array of custom serums, poisons, and targeted antidotes that make her entirely immune to toxins.In combat, Nemu relies on immense superhuman strength, high-speed movement, and an accelerated healing factor that allows her to survive otherwise fatal lacerations and bodily impalement. Her ultimate, highly destructive offensive technique is known as Gakon Injō, which allows her to sever and launch compressed fragments of her own spiritual soul energy as high-impact projectiles.