1, Madara Uchiha, Nagato, Obito Uchiha and The Sage of Six Paths ( Hagoromo). Total of 4 ninja

2, Kakashi destroyed the first heart with his Lightning Blade, the second was destroyed by Hidan by accident, and Naruto destroyed the remaining hearts with one Rasenshuriken, but it was Kakashi who delivered the killing * just to be safe.

1.Kakashi

2.Hidan

3.Naruto

4.Naruto

5.Kakashi

3, two pots with 3 flowers each = 6 flowers