Dabi, originally named Toya Todoroki, is the firstborn child of Pro Hero Endeavor and Rei Himura. His upbringing was dominated by relentless training under Endeavor, obsessed with forging a successor to eclipse All Might. Toya inherited the Blueflame Quirk, wielding firepower surpassing Endeavor’s, but his body lacked heat resistance, inheriting instead his mother’s cold tolerance. This flaw inflicted crippling burns with each Quirk activation, prompting Endeavor to discard him as a failure and redirect attention to Toya’s younger brother, Shoto. Driven by obsessive need for approval, Toya trained in secret until a catastrophic eruption of his flames at Sekoto Peak left him comatose for three years, his body ravaged by irreversible burns. Awakening to a world where his family presumed him dead and Endeavor’s abuse now targeted Shoto, Toya’s fractured psyche rejected his former identity. Reborn as Dabi, he patched his disintegrating body with surgical staples and regenerative grafts, becoming a conduit for vengeance. His Quirk intensified, generating blue flames exceeding 2,000°C, but each use hastened his physical decay. Nerve damage erased pain perception, masking the worsening erosion of his flesh until bones and tendons protruded during later clashes. Dabi allied with the League of Villains, espousing Stain’s crusade against corrupt heroism while disregarding its tenets. His true goal centered on destroying Endeavor and Shoto, weaponizing Endeavor’s hidden abuse to dismantle his legacy. In the Paranormal Liberation War, Dabi unveiled his identity as Toya Todoroki through a broadcast exposing the Todoroki family’s trauma, eroding public faith in heroes and fueling his vendetta. Nearing death in his final battle, Dabi’s overuse of Blueflame triggered a Superpower Meltdown, threatening a lethal explosion. In critical instability, a latent ice Quirk—inherited from Rei but suppressed by Endeavor’s fixation on fire—activated instinctively, freezing his body from within. This unforeseen survival highlighted the tragic duality of his heritage, buried under paternal obsession. Postwar, Dabi’s body became skeletal, flesh seared to exposed bone and ash. Confined to life support, immobilized yet clinging to hatred, he lingered in agonizing stasis. The Todoroki family’s intervention forestalled his death, trapping him in perpetual decay—a grotesque testament to Endeavor’s legacy and the unbroken cycle of familial ruin.