My Hero Academia Confirms Aizawa's Quirk Has Devastating Secret Weakness

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Warning: contains spoilers for My Hero Academia chapter 347 andMy Hero Academia Vigilantes chapter 121!

Everyone's favorite teacher from My Hero Academia, Shota Aizawa (AKA Eraser Head), has a top-tier quirk that lets him disable any opponent's powers just by looking at them. While he's shown that he's quite aware of the power's weaknesses, like the need to keep his eyes open, or maintaining a line of sight on the target, there's one more weakness which Aizawa seems powerless to overcome.

Despite its status as a prequel, Aizawa has been a fairly major character in My Hero Academia Vigilantes, acting as a bit of a mentor to that series' protagonist Koichi in addition to performing the usual work expected of a pro hero — at least, what was expected of him before he became a teacher. Vigilantes reveals that Aizawa's trademark goggles, which he uses to protect his eyes and hide his line of sight, originally came from his childhood friend Shirakumo, and marked a major turning point in how he could use his quirk. Given Shirakumo's ultimate fate, the goggles take on a more personal meaning, but in both respects have been a key element of how he sees himself and his role as a hero.

Related: My Hero Academia Just Skipped What Should Have Been Aizawa's Best Moment

Once Aizawa arrives to lend Koichi a hand in the battle against the out-of-control Number Six, it seems like the fight should be over. After all, if Aizawa looks at Six, that should deactivate its giant flame-body quirk and leave the villain a burned-out mess. Instead, Aizawa grabs Koichi and flees momentarily, explaining that there's one more weakness to Erasure: a sufficiently bright object becomes nearly impossible to lock his gaze on, even if he can keep his eyes