Zetsu comes in episode 142 naruto shippuden Japanese book!!!(This is the main part)!!!
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Kishimoto Masashi (author) had originally planned for the akatsuki to be a group of monsters and each character represented something (zetsu = Plant) zetsu was one of them. But he changed the idea of the akatsuki, and he like Zetsu so much he decided to keep him.
The "plant guy" is Zetsu, who is a member of the Akatsuki. In the early episodes of shippuden, he usually just watches fights from the sidelines and reports the outcome to the other Akatsuki members.
Zetsu's ring is green, and he wears it on the right little finger.
This happened in Naruto Shippuden Chapter 678, Black Zetsu Betrays Madara.
Yes, Zetsu does have arms, he just hasn't had a chance to use them yet becasue there hasn't been an opertunity where he can use them , when we can see.