Himiko Toga's childhood was defined by intense familial rejection over her Quirk, Transform, which fueled her fascination with blood. An incident where she brought a dead, bloodied bird to her parents led them to accuse her of killing it and demand she suppress her "abnormal" urges to fit society's mold. Forced into Quirk counseling, she adopted the facade of a cheerful, well-mannered schoolgirl while struggling internally with her inability to express her true nature. This repression reached a breaking point when she saw her classmate Saito bloodied after a fight; misinterpreting her resulting feelings as a crush, she attacked him with a box cutter, drank his blood, and fled home after her parents publicly disowned her as a "demon." She then became a suspect in multiple blood-draining murders, evading capture until joining the League of Villains. Her Quirk, Transform, allows her to assume the physical appearance and voice of others by ingesting their blood, with larger quantities enabling longer transformations. The ability also grants access to the Quirks of those she mimics, dependent on her emotional connection to them, such as using Ochaco Uraraka's Zero Gravity after strong identification. The transformation replicates the target's clothing, leaving her nude upon reversion. Beyond her Quirk, she possesses heightened agility, stealth proficiency demonstrated by evading capture for years, and combat skills primarily using knives stored in thigh-mounted containers. Her equipment includes a mask with needles and canisters for blood extraction and storage. Toga projects a bubbly, energetic personality with frequent smiling, blushing, and a lovesick demeanor. This masks a deeply distorted understanding of love, equating sucking blood to "kissing" those she admires, often individuals who are injured or bloodied, like Izuku Midoriya. Her obsession drives her to literally become them through her Quirk. Despite her sadism, she genuinely craves connection, viewing the League of Villains as a found family where she can be herself. She experiences volatile mood shifts, turning coldly violent when interrupted during moments of "affection," yet shows fierce loyalty to comrades—comforting Twice during breakdowns and avenging Magne's death. Her internal conflict stems from societal rejection of her Quirk-influenced nature, fueling her belief that destroying hero society will create a world where she can live freely. Toga's narrative arc intensifies through key conflicts. Introduced in the Vs. Hero Killer arc expressing admiration for Stain, she formally joins the League. During the Forest Training Camp attack, she battles Ochaco Uraraka and Tsuyu Asui, draining Ochaco's blood and developing an obsession with Izuku Midoriya. This fixation deepens when she infiltrates the Provisional Hero License Exam disguised as Camie Utsushimi to interact with him. Later, she and Twice deliberately sabotage the Shie Hassaikai operation to avenge Magne. The Paranormal Liberation War marks a turning point: after Twice's death, she suffers a psychological break, creating duplicates of him using his blood and launching a vengeful rampage. In the Final War, her rage amplifies as she generates armies of Twice clones, though unable to fully replicate his Quirk. Her final confrontation with Ochaco reveals her despair over societal rejection and longing for acceptance, culminating in her sacrificing her own blood to save Ochaco's life, an act that leads to her death. Her relationships define much of her development. Within the League, she shares a sibling-like bond with Dabi, who burns down her family home. She views Tomura Shigaraki as a leader validating her freedom, adopting his philosophy to "destroy what you hate." Her closest connection is with Twice, whom she comforts after Magne's death; their mutual support during Shie Hassaikai highlights their deep platonic bond. Toga's unrequited dynamic with Ochaco underscores her isolation; she sees Ochaco as a potential friend due to their shared repression of feelings—Ochaco for Izuku, Toga for her blood urges—but is repeatedly rejected. Her death during the Final War, resulting from giving blood to save Ochaco, becomes a catalyst for change. Ochaco, recognizing Toga's villainy stemmed from lack of support, establishes the Quirk Counseling Expansion Project to aid individuals with dangerous or stigmatized Quirks. In her final moments, a clone of Toga attacks Hawks, Twice's killer. Her legacy reflects tragedy and reform, highlighting hero society's flaws while paving the way for greater empathy.