Toya Todoroki, later named Dabi, emerged as the firstborn son of Enji Todoroki (Endeavor) and Rei Himura, conceived through a Quirk marriage designed to breed a heir powerful enough to eclipse All Might. Though he inherited a fire Quirk surpassing Endeavor’s Hellflame in raw strength, Toya’s physiology combined his father’s power with his mother’s cold resistance, rendering him vulnerable to extreme heat. Each use of his flames inflicted crippling burns, a flaw that led Endeavor to discard Toya’s training in favor of grooming a new successor—Shoto, born with a balanced ice-and-fire Quirk. Driven by desperation for recognition, Toya secretly honed his abilities, recklessly pushing his Quirk past its limits. At 13, after Endeavor ignored their scheduled meeting at Sekoto Peak, Toya’s anguish ignited an uncontrollable inferno that ravaged the mountainside and left him near-fatally charred. Presumed dead, he survived in a three-year coma before All For One’s associates revived him using experimental regenerative grafts. Awakening to a family that had erased his memory, with Endeavor fixated solely on Shoto, Toya’s fractured identity crystallized into Dabi—a villain vowed to obliterate Endeavor’s legacy. Dabi’s disfigurement became his hallmark: stapled burns crisscrossing his frame, turquoise eyes blazing beneath shock-white hair streaked with crimson. His Blueflame Quirk produced searing azure fires exceeding 2,000°C, but each activation eroded his flesh, eventually exposing muscle and bone. Modified by All For One to lack pain perception, he fought with frenzied endurance despite his disintegrating body. Aligning with the League of Villains, Dabi cloaked his personal vendetta under a veneer of Stain’s ideology, manipulating the Paranormal Liberation Front to dismantle hero society’s foundations. He orchestrated strategic events to publicly unmask Endeavor’s abusive history, culminating in the Final War arc, where he broadcast his true identity worldwide. Intent on annihilating Endeavor and his reputation in a 5-kilometer self-detonation, Dabi’s final strike was foiled by the Todoroki family’s coordinated ice Quirks, which suppressed his flames. Post-battle, Dabi’s body lay skeletal and frostbitten, sustained only by life-support machinery. Though mentally reduced to a childlike state during his meltdown, fleeting glimpses of remorse for targeting Shoto surfaced before his physical collapse. His arc, rooted in familial rejection and a hunger for acknowledgment—even through mutual annihilation—highlighted cycles of inherited trauma and parental failure, framing him as a tragic figure whose existence critiqued societal binaries of heroism and villainy.