To me Tag(Items Copy) is the best thing that happen to this game since release.
I am finnaly no longer locked to just playing 1 character and can enjoy playeing a second one.  And it created an opportunity to enjoy the different varity of combat during grinding sessions. 

I would vey much like this feature to be expanded beyond 2 characters so i could enjoy even more different variety of combat styles that 21 characters brings to the game.

I agree. I made my own thread some time ago. Easiest way to implement this would be just have item copy gear not be destroyed after untagging. I wouldn't mind paying the silver fee again for each character since I think it's fair. Substantial enough that it can't be done repeatedly without care, but also infinitely faster than trying to get a whole new set of gear (Especially if your main is super geared and you want that for another) for another character.