Hello 
So I had a quick question that I am hoping someone with experience may have the answer to.
If I buy the lover swimsuit set on my shadow hunter (or any applicable character other than mgunner), can I open it on my scouter when the class launches. ie: will the box change depending on which character im on. I have noticed that skin boxes can change in your shared bank like the maze set. My roster is full with no other gunner otherwise this would be an easy solution and I believe the event will end by the time the next class launches which will be scouter Copium
As long as its in the box, it is fine to swap around all your character. Once you open the box and get the actual skins, its locked to that class type.
So yes, you should be able to save a skin for your scouter