[@Genon] I don't like how you wrote this Quirk. It's too versatile, not focused enough and not well balanced in my opinion. Gaining speed and pwoer from storing sound sounds just like an excuse to have another hero with super strength and speed, which are two things that are supposed to be a lot more rare in MHA than other super heroes stories. I just feels like literally everyone wants that, and it's a bit annoying to be honest. 

A quirk that blocks sound around himself and store it to use it back in sounds shockwaves sounded do-able, but I'm not ready to accept the accumulation part that makes him stronger for no good reason.