Since the client might have to be changed (cause of the flash player update) i have a few suggestions to implement as quality of life changes.

1) The ability to buy other mains.

I know you can unlock other mains but the ability to only change them twice per day and the fact that i have to log in again when i do is annoying. Maybe the ability to buy them with coupons and to be able to switch them as many times per day as we want would be better, even if we have to still log in again after switching. The price could grow exponentially like 500 coupons to buy one main, 1000 to buy the second and then you can even make them ingots only. If it is possible to fix the having to log in then we could maybe be able to make different sets using different mains. You could code them as the same ninja that way you cant have more than one on your team.

TLDR: Ability to buy other mains to change more than twice and to make sets with different mains at the same time.

2) The ability to buy more sets.

I think its kinda lame that we only get 3 sets for free and temporarily unlock more with medals. Just like the suggestion above i would love to be able to spend coupons to buy at least 1 more set. Maybe you can make it so we can buy 2 more sets (prices like before 500 and 1000 coupons), but let people with medals be able to buy even more sets. Maybe the ability to rename sets and the ability to have at least 2 arena sets (so i can have one tryhard team and other testing team)

TLDR: Ability to buy more sets, rename them and one more arena set.

3) Adding more rewards at groceries.

This one isnt that much needed like the ones above but there are some items that are rare like experimental protection vials, that can only be bought with coupons or from an event. For example we get advanced protection vials from great plates, i got around 100 in one week and it was great but i didnt get any normal ones.Also the fact we can buy experimental vials from groceries but not protective is weird, i can breakthrough my guy 50 times but cant protect any of those.

TLDR: Add protective vials to groceries shop.

4) Shortcut to ninja interface when preparing for combat.

This is a simple one, just add a shortcut to the ninja interface when ever we can edit our team before a fight. Having to close ninja exam, open up ninjas find breakthrough change it and then go back again just to try to win once and then change back takes a lot of time. Just one *on that takes us to ninja so we can change their mood or breakthrough before a fight would be fine.

TLDR: Faster way to change ninjas breakthrough before a fight.

I would love to hear what you think about my suggestions :D