Enji Todoroki, known professionally as Endeavor, forged his resolve to become a hero after witnessing his father die during a failed child rescue. This tragedy propelled him to U.A. High School, where he adopted the hero name Endeavor and swiftly claimed Japan's number two hero ranking by age 20. His inability to surpass the undisputed number one, All Might, ignited an obsessive drive. Convinced he could engineer a successor capable of achieving his goal, he entered a quirk marriage with Rei Himura for her ice-based quirk, aiming to produce a child inheriting both fire and ice abilities. While the marriage initially held moments of affection, Endeavor's fixation intensified after their first son, Toya, manifested an overpowered fire quirk mismatched with a heat-sensitive body. Deeming Toya a failure, Endeavor shifted focus to subsequent children until Shoto was born with the ideal quirk combination. Endeavor subjected Shoto to brutal training from age five, physically and emotionally abusing Rei when she intervened, culminating in her throwing boiling water on Shoto during a mental breakdown. Rei was institutionalized, while Toya, presumed dead after secret training, resurfaced as the villain Dabi. Following All Might's retirement post-Kamino Ward, Endeavor inherited the number one hero position by default. This promotion triggered profound self-reflection on heroism and his paternal failures. He initiated tentative steps to reconnect with his family, including visiting Rei in the hospital—initially too ashamed to show his face—and supporting Shoto at U.A. events. This fragile reconciliation shattered when Dabi publicly exposed Endeavor's abuse during the Paranormal Liberation War, seeking to destroy his legacy. Endeavor publicly confirmed his past actions without seeking forgiveness, vowing to atone. His resolve faced further tests in battles against high-end nomus like Hood, whom he killed using his ultimate technique, Prominence Burn, and against Shigaraki, whom he significantly wounded despite severe injuries. Endeavor's quirk, Hellflame, grants pyrokinetic abilities enabling fire generation, temperature control, and propulsion for limited flight. Combat techniques encompass wide-area attacks like Karmic Raze - Hellfire Storm and Raging Assault - Hell Minefield, precision strikes like Flashfire Fist - Jet Burn and Hell Spider, defensive maneuvers like Hell's Curtain, and the high-output Prominence Burn, which risks overheating his body. His physical capabilities rank at small country level in attack potency and durability, with high hypersonic+ speed and extensive combat acumen honed through his record number of resolved cases. Post-war, Endeavor confronted Toya in a hospital where doctors confirmed Toya was dying. Endeavor expressed regret for his neglect and announced his retirement from hero work, committing to spend Toya's remaining days with him. Toya initially rejected this, calling Endeavor a coward, but later tearfully apologized to Shoto after bonding over shared preferences like soba. Endeavor accepted his son Natsuo's decision to cut ties but reiterated his lifelong commitment to bearing responsibility for his actions, ensuring his family would not suffer further consequences from the Dabi scandal. Natsuo acknowledged this resolve as commendable despite believing his father deserved damnation. Endeavor's physical condition required extensive bandaging due to battle-sustained burns, symbolizing the culmination of his journey from an abusive seeker of glory to a figure facing the repercussions of his past while striving for redemption.