Zetsu

Zetsu is the only member of Akatsuki to regularly act without a partner. This is in part a result of his ability to merge with any object and quickly travel to a new location, a feat few other ninja are capable of. Because of this ability Zetsu serves a variety of different positions in Akatsuki, such as a spy that observes and reports on battles of interest or a lookout during Akatsuki's meetings.
Being cannibalistic, he is often sent to dispose of bodies Akatsuki does not want found, mirroring the large venus flytrap that envelops his body. Zetsu's body is split into two half’s, both light and dark, similarly, the two sides have their own personalities and knowledge bases, frequently leading to discussions and arguments between the two. The black half speaks in Katakana in the Japanese manga, while the white speaks Kanji and Kana. He use “Kai” (Boar) ring on his right little.
When Naruto fought Sasuke at the Valley of the End, Zetsu spied on the proceedings. When Kakashi came to retrieve Naruto, he emerged from the ground and watched them return to Konoha. Several years later he watched over Gai and his team who were going to meet up with Kakashi in their search for Akatsuki. Zetsu appears to extend a sixth-type sense from his body to the area around him, rather than by relying on his eyesight alone. Also his different halves seem to have different personalities, with the black side speaking in a strange, unusual manner. He was also commanded at one time to eat the bodies of Sasori's dead subordinates.
Zetsu later appeared in the destroyed former cave base of the group with new recruit Tobi. One of Zetsu's sides favored Tobi and thought of him as a good young man. When Tobi found Sasori's ring, Zetsu debated whether the young man was worthy to replace the former member. He and Tobi then traveled to locate Deidara. Tobi managed to find Deidara's arm. Deidara himself soon arrived to take back his lost limb. Later when Hidan and Kakuzu captured the Nibi Jinchuuriki Nii Yugito, Zetsu arrived to take on the duty of returning her body to their base of operations.