Misc. Why does he do that? Why does Tomura Shigaraki have so many hands attached to his body? He starts to give up because their plans are dashed if dozens of Pro Heroes show up to stop them. He decides that before the Pros arrive, they should destroy All Might's will by killing his students. Has Tomura been shown to be immune to the effects of Decay, like Endeavor and his Hellflame, or Mineta and Pop Off, or does it affect Tomura the same way it does … Tomura Shigaraki is born. Along with that story of death, killing, and rebirth, My Hero Academia fans also get to have a longtime question answered: Why does Tomura Shigaraki wear those hands all over his body? [My Hero Academia] What’s with Tomura Shigaraki constantly scratching his own neck? Tomura’s Quirk, Decay, causes anything he touches with all five on one hand to crumble away to dust, like localized, accelerated entropy. I recently got into this anime (just started Season 3), but I can’t help but wonder about Tomura’s habit of scratching the sides of his neck. This greatly irritates Tomura and he starts to scratch his neck. As we've seen throughout the series, Shigaraki has a nasty habit of scratching his neck, often resembling an addict going through withdrawals. When I started watching My Hero Academia, I thought Shigaraki's quirk was going to be that he has an extra set of hands that float around him that would lead him to an advantage to his opponent.