@Kyle From Hoenn @Iazy guy who loves to eat , I understand the problem here. Let's try to resolve it quickly as not to crowd the thread too much. This is not the first complaint we have heard about Jack's powers, and I've been trying to look into the root of the problem. While, admittedly, he has a versatile quirk- and most of his moves make sense; I have just two little suggestions to help limit that:
1. Instead of making gauntlets that are 'lighter than air' or a boulder that is heavy enough to break someone's bones, we make it so Jack can't manipulate the weight of his objects. They simple weigh as much as a regular gauntlet/boulder would weigh, so the items he creates are identical in weight to whatever it's solid form would weigh. Also, since it was previously referred to be Jack's RPer, "the gauntlets would be heavy and hard for him to handle" , he has a limit to the weight that he can carry. I.E. it is easier for him to create a bunch of little pebbles than one large rock, he can only manipulate and object of shadow as well as he would be able to pick up that same object if it were solid.
2. His quirk can create models of objects, but they don't work. He can create the shape of a rock, chain, cage, even gun; though that gun does not have the parts necessary for it to shoot anything. So he couldn't shoot a rocket gun or make a bomb that actually explodes, because there are other mechanisms behind that (gunpowder, etc) that his shadow can't reproduce. So he can only make a shell, though it is not functioning.
Is that comprehensible? Let me know if anyone has any other comments or suggestions about this.