Izuku Midoriya entered a world saturated by superhuman Quirks uniquely lacking one himself. This Quirklessness fueled childhood bullying, most persistently from Katsuki Bakugo who branded him "Deku" (meaning "useless"). Yet, Izuku fiercely idolized the symbol of peace, All Might, clinging to his dream of becoming a hero. His defining moment came when he instinctively rushed to save Bakugo from a villain, an act of raw heroism witnessed by All Might. Impressed, All Might revealed his weakened form as Toshinori Yagi and offered Izuku his transferable Quirk, One For All. Following ten months of grueling training, Izuku inherited One For All by consuming a strand of All Might's hair. Enrolling at U.A. High School, classmate Ochaco Uraraka reframed "Deku" as "you can do it," inspiring him to adopt it as his hero name. Initially, One For All's overwhelming power shattered his limbs with each use. He adapted by creating "Shoot Style," emphasizing kicks over punches, and integrating protective Iron Soles into his costume for enhanced striking. His first costume, a green jumpsuit designed by his mother and inspired by All Might, featured a mask with ear-like protrusions and a respirator. Izuku later uncovered that One For All housed additional Quirks from its past wielders: the energy tendrils of Blackwhip for capture and mobility, the levitation of Float, the kinetic energy storage of Fa Jin, the velocity manipulation of Gearshift, the threat detection of Danger Sense, and the smoke generation of Smokescreen. Mastering these demanded intense training, with Blackwhip initially overwhelming him during a school exercise. His costume evolved through multiple revisions to support his growing arsenal, adding Air Force Gloves for ranged attacks and Mid-Gauntlets for limb support. By its sixth iteration ("Zeta"), it sported a darker palette, Gran Torino's cape repurposed as a scarf, and a damaged respirator. His hero path led to confrontations with major villains like Muscular, Overhaul, and Tomura Shigaraki. During the Paranormal Liberation War, Shigaraki targeted him for One For All, prompting Izuku to leave U.A. to shield his classmates. This isolation fostered a darker, detached phase where he operated solo, his appearance turning monstrous with blood-stained gear and uncontrolled Blackwhip tendrils. His classmates intervened, reaffirming their bond, and Bakugo offered a long-awaited apology for past bullying, convincing Izuku to return to U.A. In the final clash against Shigaraki and All For One, Izuku employed "Deku Overlay," merging Blackwhip with his body for heightened combat prowess. He ultimately transferred all One For All Quirks into Shigaraki to weaken him, defeating both adversaries but losing his arms temporarily to decay before Eri's Rewind ability restored them. This victory cost him One For All permanently, returning him to Quirklessness and leaving scars across his face and hands. After graduating, Izuku became a history teacher at U.A. Eight years later, technological advances enabled his return to active hero duty with a nano-tech suit mirroring his "Zeta" costume and a yellow cape. He achieved the rank of No. 4 Pro Hero while continuing to teach. Throughout his journey, Izuku consistently displayed compassion, optimism, and analytical thinking. He maintained his habit of mumbling detailed Quirk analyses and extended empathy even to villains, believing in their capacity for redemption. His connection with Ochaco deepened into mutual romantic feelings, though he often masked his emotions. His foundational bond with All Might remained central, serving as both mentor and enduring inspiration.