Naruto (manga)
Zetsu, an Akatsuki who is not human. He spies for the Akatsuki.  He can get rid of dead or secret Akatsuki members.  Therea re two parts of Zetsu.  Black Zetsu is like a shadow. He was created by Kaguya to control Indra.  Black Zetsu pretended to be controlled by Madara.  White Zetsu is one of many former humans that became part of the Gedo Statue.  Sasuke killed White Zetsu during the Fourth Great Ninja War. After that, Black Zetsu went to Obito. Then he went to Madara. Finally, he was sealed with Kaguya.