How does izuku lose his quirk

Overview

In the popular manga and anime series My Hero Academia, Izuku Midoriya is initially born without a quirk in a world where 80% of the population possesses superhuman abilities. At age 14, he inherits the powerful quirk One For All from the number one hero All Might, becoming the ninth user of this ability that can be transferred between users. One For All is a unique stockpiling quirk that grows stronger with each generation, accumulating power from previous users. The series follows Izuku's journey at U.A. High School as he learns to control this overwhelming power while facing various villains, including the League of Villains and later the Paranormal Liberation Front. The story explores themes of heroism, sacrifice, and the societal impact of quirks in a world where superpowers have become the norm since their emergence approximately 200 years before the main events of the series.

How It Works

Izuku loses his quirk through a combination of extreme physical strain and the unique mechanics of One For All. During the climactic battle against Tomura Shiguraki in the Paranormal Liberation War arc, Izuku pushes One For All beyond 100% of his current capacity, accessing the dangerous 'Faux 100%' state. This causes severe damage to his body, particularly his arms and legs, which had already sustained previous injuries from overusing his quirk. The strain is so extreme that it temporarily severs his connection to One For All, rendering him quirkless. Medical examinations by Recovery Girl and other heroes confirm that his quirk factor has been temporarily suppressed due to the trauma. The loss isn't permanent because One For All exists as both a physical quirk factor and a spiritual legacy that can regenerate given time and proper healing, unlike conventional quirks that would be permanently lost from such damage.

Why It Matters

Izuku's temporary quirk loss represents a crucial turning point in My Hero Academia, demonstrating the physical and psychological costs of heroism. This event forces Izuku to confront his identity beyond his quirk, echoing his original quirkless state and reinforcing the series' theme that true heroism comes from character rather than power. Narratively, it creates tension as Japan faces its greatest crisis while its rising symbol is incapacitated. The arc explores how society and other characters react when their emerging symbol is vulnerable, setting up important character development for both Izuku and supporting characters who must step up in his absence.