The device is the mutater and it can't come of of him. The Cursed One's real name is unknown and he doesn't tell anyone. Naruto tries to help him from time to time but The Cursed Ninja always just gets into a fight with him. This ninja knows a lot of Jutsu and every Chakra type he know as well. The Cursed Ninja lived a normal life until he became a monster. He wants to force the Akatsuki to do his bidding and he is on his own side.