Deku can change the law of physics around him. He can bounce off or slide on surfaces. He can hit something and it looks like he has super strength. He can fall from any height and survive. He can nullify physical attacks. (My knowledge on physics isn't the best but you can add your knowledge to it). I feel like this could be an op quirk with deku's intelligence and creativity.
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Mha Quirk Ideas
FanfictionJust a guy too lazy to write a story so instead makes quirks he would like a story of and hopes someone uses it. Feel free to take any ideas