Cash shop storage question

I've tested this once with Arans, this is what I found:

If you only have ONE character with that specific type of CS. Deleting the character = clearing the CS.
If you have TWO or more characters with that specific type of CS. Deleting the character = keeping the CS.

So in your case, it just sounds like you need to make the new UA before you delete your fighter.

arans are different, they don't share cs with anyone, hence cs inventories disappears with the character. since explorers share inventories, it should work like banks. unless you've try the same with explorers, i doubt the result is the same ;]