Okay so say I have Kisame Samehada and I didnt use him and my friend had Shisui and needed Kisame Samehada and I needed Shisui.
Would it be cool to have like a Ninja trade option where you have 2 equally rare Ninjas and being able to trade them with a Fine of 100 - 1k coupons/ingots?
I just think it would be really use full for some people so its not a total waste if your never gonna use that "Rare" ninja you could also do it for other ninjas like
Sasuke 5* for 1-5* Naruto or Sakura

Ofc the other person would HAVE to have the other ninja you wanted to trade Shisui or whoever for.