Ino's Flower does not require any coupons and is one way to get Madara T10, Shisui Sus, and Obito T10, but it takes a long time saving up since you need Normal and Small Stamina Pots to reach the leaderboard

I also forgot to include Sakura's Gift which you c*e cpns to get one of the following ninjas above too, except for shisui sus I believe