Is Zetsu a human?

Being a mutated human, White Zetsu was able to survive without food or water and did not need to carry out normal human bodily functions. He could, however, quickly devour another individual completely, as he was normally tasked to dispose of dead Akatsuki members or allies that way.

Is Tobi obito or Zetsu?

Tobi, also known as Guruguru (dubbed: Swirly), is a minor antagonist from the manga/anime series, Naruto. He is one of the many humans that fell victim to Kaguya’s Infinite Tsukuyomi in the past and was transformed into a White Zetsu.