Nishiki Nishio, a second-year Pharmaceutical student at Kamii University, once guarded a feeding ground usurped by Rize Kamishiro. Orphaned early, he and his sister relied on each other until her betrayal and death at CCG hands compelled him to inherit her savings and identity, forging a deep-seated distrust in others that fueled his manipulative, self-centered nature. His calculated approach toward human Kimi Nishino masked initial exploitation, yet her acceptance of his ghoul nature kindled unexpected loyalty. Driven to shield her, he abandoned human hunting and sought refuge at Anteiku. Early clashes with Ken Kaneki over territory escalated into violence, but their uneasy alliance during the Gourmet Arc—uniting to rescue Kimi from Shuu Tsukiyama—cemented his place within Anteiku’s ranks. Emerging post-timeskip under the alias Serpent, Nishiki earned an S-rated CCG classification, donning a serpentine mask, hooded cloak, and a distinctive scar across his left eye—emblems of his merciless reputation as a hunter of both humans and ghouls. Beneath this hardened exterior lingered a somber wit and sardonic humor, surfacing during encounters with the Quinx Squad and his terse acknowledgment of Kaneki’s fractured identity as Haise Sasaki. Pivotal in operations like the Owl Suppression and Rushima Landing, he eventually aligned with Kaneki’s Goat faction, settling in the 24th Ward. Kimi’s survival of Torso’s assault galvanized his relentless pursuit of the ghoul, intertwining vengeance with his resolve to safeguard her. Once arrogant and solitary, Nishiki’s traumas and devotion to Kimi reshaped him into a guarded yet steadfast ally. His academic acumen and tactical ingenuity endured, channeled into a survivalist pragmatism that tempered predatory instincts with a begrudging allegiance to those he deemed worthy.