HAHAHAHAAH OH MY GOD
With designing a hero outfit try not to add as much constrictive things such as muzzles or chains. It makes them look like they just broke out of a prison of some sort. Try giving him a more bulky/flowy outfit instead! Also try to add a few colors in it. For that babe I'd use like a magma orange highlight in the costume to make it show his quirk. Another thing to do would be to make him stand up straighter but still make him look loose. Its weird but it'll help.