1. The Sage of Six Paths, Uchiha Madara (Second Rikudo), Nagato (Third Rikudo) and Uchiha Obito.

2. First one was destroyed by Kakashi, second was destroyed by Hidan, third was destroyed by Naruto, fourth was destroyed by Naruto again and fifth one was destroyed by Kakashi once more.

3. His tombstone contains two pots with 3 flowers each in them.