2772/11=252

If you would take calculator, you could count, like in life you count how much ice creams cost. It's not RNG points.

Naruto is 126 points, so 2x that, since Missions Gift Box cost 20 coupons. 126x2 = 252 coups per frag. Multiple that from frags you need, and you will find how many coupons you need in total.

As for ninja - Edo Itachi. Even when you won't use Naruto 6p, he will still support any other lineup.