Tooru Mutsuki navigates a fractured identity shaped by trauma, gender dysphoria, and psychological turmoil. Assigned female at birth but identifying as male, they adopted masculine pronouns and concealed their biological sex with a chest binder—a coping mechanism rooted in childhood abuse and profound discomfort with their gender. This trauma intertwined with a suppressed familial truth: their parents were not ghoul victims but died at Mutsuki’s hands during a dissociative episode, memories initially fragmented and later unearthed. Physically, Mutsuki’s appearance shifted dramatically. Starting with dark ivy hair styled in a bob, their hair lightened over time, eventually bleaching white under psychological strain. A persistent kakugan in their right eye necessitated a medical eyepatch, later swapped for a leather one gifted by mentor Haise Sasaki. Scarring, including a prominent mark on their upper left chest, bore silent witness to past violence. As a Quinx Squad member, Mutsuki grappled with anemia, blood aversion, and shaky combat skills, yet gradually honed lethal proficiency. They mastered Bikaku Kagune manipulation, detached kagune deployment, and rapid regeneration. Their exceptional RC cell control—potentially linked to repressed trauma—evaded standard detection protocols. Targeted by the ghoul Torso, who fixated on their biological sex, Mutsuki endured torture that fractured their psyche. Dissociative episodes unleashed a violent alter ego, driving them to murder Torso and commit necrophilia, later reframed as retribution for identity violation. This duality split their persona: a reserved, principled investigator versus a vengeful, obsessive force. Their fixation on Sasaki—revealed as Ken Kaneki—spiraled into delusion, fueling attempts to eliminate perceived rival Touka Kirishima. Relationships pivoted Mutsuki’s trajectory. They idolized Sasaki as both mentor and unrequited love, blurring professionalism into obsession. Tensions with Kuki Urie and camaraderie with Ginshi Shirazu fluctuated, with Urie ultimately steering them toward accountability post-Clown Siege. After abandoning the CCG amid escalating violence, Mutsuki relocated to a rural branch, tentatively rebuilding stability alongside Shinsanpei Aura and Ayumu Hogi. Their narrative weaves identity conflict with mental unraveling, trauma cycling between repression and explosive violence. Antagonistic acts—manipulation, murder, psychological warfare—contrast moments of faltering self-awareness, framing a fractured journey toward uneasy redemption.