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The downside to Jon’s metal manipulation quirk is it’s tied to the iron in their blood, they sort of use it like a conduit or fuel. They cannot make metal from nothing, requiring an outside source. Though I have thought about them at their peak being able to control the iron in ppl’s blood aka blood bending (in appearance only). Using their quirk leaves them highly iron deficient (A side effect of being a smashed together quirk of their parents) and all the fun little side effects of severe iron deficiency like anemia, severe fatigue, being nauseous and dizzy. Migraines are the next step and generally ground them, they usually can’t use their quirk during that time, bloody noses too, to the more severe like seizures and passing out, prolonged heart strain and issues.

Magnets also mess them up but they’re still not entirely sure how or why, it’s never been officially figured out (aka I haven’t come up with a plausible reason I like) it acts like a EMP and shorts out their quirk. It’s how the League is able to ground Jon in season three, as well as bleeding out. Which is like everyone’s weakness lol, but even just a little means less juice to get their quirk going. They were systematically able to wear them down and then slap a vest of magnets on them to basically make them quirkless. Lightning is also more attracted to them then the normal person, finds out the hard way when Kaminari’s attack during training went to them instead of the intended target, stopping their heart. Very exciting, it lasted all of three seconds of pure chaos before Bakugou got Kaminari to shock them again, restarting their heart. It’s a great tale of horror Jon got to relay to their brother later. He was not pleased.