Zetsu

ゼツ

Zetsu is readily identified by two large, Venus flytrap-like appendages that envelop his head and upper torso, lending him a botanical appearance. When these extensions open to reveal his head, it becomes apparent that his body is divided into two distinct colored halves: the left side is entirely white, while the right side is black. Correspondingly, Zetsu appears to possess a split personality. In the Japanese manga, the black half of his face speaks exclusively in Katakana, whereas the white side uses Kanji and Kana. In the English dub, the black side is voiced by a different actor than the white side. The two halves converse with one another and occasionally hold differing opinions; the black half is more serious and intelligent, while the white half is carefree and easygoing. They also seem to communicate telepathically. Consistent with his Venus flytrap motif, Zetsu is a cannibal.
Zetsu appears highly trustworthy, having been entrusted with knowledge of Pain and Tobi's identities. He has apparently been collaborating with the latter for some time; Tobi first appeared as his "subordinate," and Zetsu later remarked that Tobi's plans had been in development for a long time.
Zetsu's primary role within the Akatsuki is to serve as a spy, frequently acting as a hunter-nin for the organization. He has demonstrated the ability to move his body and participate in the tailed beasts sealing ritual simultaneously. This unique capability allows him to act as a lookout while the sealing proceeds. When an Akatsuki agent, or possibly even a member, dies, Zetsu is dispatched to devour their bodies to prevent their secrets from being revealed. He is also the one sent to retrieve the rings of deceased Akatsuki members. Due to this role, Zetsu is the only Akatsuki member who regularly operates without a partner. Despite this, he serves as a sort of superior to other members, as they often report directly to him rather than to the actual leader, Pain.