1, Madara Uchiha, Nagato, Obito Uchiha

2, first by kakashi, second by hidan, third by naruto, fourth by naruto and fifth by kakashi

3, two pots with 3 flowers each

Those who have both Uchiha and Senju DNA (which allows you to awaken the Rinnegan) can summon the Gedo Mazo. Only four people have been able to do such: The Sage of Six Paths, Uchiha Madara (Second Rikudo), Nagato (Third Rikudo) and Uchiha Obito.

His first heart was destroyed by Kakashi, His second heart was destroyed by Hidan, Two more hearts were destroyed by Naruto's Rasenshuriken, His last heart was destroyed by Kakashi.

6

1, Madara Uchiha, Nagato, Obito Uchiha, hagoromo

2, first by kakashi, second by hidan, third by naruto, fourth by naruto and fifth by kakashi

3, two pots with 3 flowers each