Hidan (who is in fact invincible, thus being somewhat of an ultimate ninja; only got defeated by getting bombed to pieces without having kakuzu to repair him)
Madara's brother (who was a super strong ninja, but gave his eyes to madara so he could keep on using his sharingan without getting blind)
The first hokage (As a backup plan, Madara has to fight with his biggest rival if he refuses to work together)
Someone we don't know about at this moment
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