Obito Uchiha was teammates with Kakashi Hatake and Rin under the Fourth Hokage. Obito was frequently late for missions due to the random good deeds he would carry out, which greatly irritated Kakashi. He also seemed to have had a crush on Rin. When Rin is kidnapped during the Kakashi Gaiden arc, Kakashi, the current team leader, insisted that they continue the mission instead of saving her. Citing that those who do not save their teammates are no better than trash, Obito refused and eventually managed to persuade Kakashi to join him. During their rescue effort Kakashi lost his left eye as a result of an enemy ninja's attack, and Obito awakened his Sharingan to save Kakashi and defeat the ninja. Once finding Rin, Obito again saved Kakashi by pushing him out of the way of a rock slide, though has his right side crushed in the process. Unable to escape with his teammates, Obito had Rin implant his remaining Sharingan eye in Kakashi's damaged eye socket as a gift. In chapter 599 it is revealed that Tobi is actually Obito Uchiha who was teammates with Kakashi Hatake and Rin under the Fourth Hokage.
Tobi was formerly Zetsu's subordinate, and became a full Akatsuki member after Sasori's death. He now wears the same ring as Sasori, having recovered it after Sasori's death, and took his place as Deidara's partner. Unlike the majority of ninja thus far, Tobi has not been shown wearing a visible forehead protector, so his place of origin is unknown. He wears an orange mask with single eye-hole covered in a swirl pattern concentrated towards the right eye. This odd mask that covers his entire face save for his right eye. Furthermore, Tobi has several bolts or pins present on the arms of his uniform, now obscured by his Akatsuki cloak. Tobi's area of expertise remains unclear, as he has never been shown fighting. He and Deidara have defeated the three-tailed beast, but Tobi is never shown doing anything but running from it. After the battle, which goes largely unwitnessed, Tobi claims to have knocked it out with a single attack. Deidara disagrees with the assessment, claiming that it was his "artistic contribution" (exploding clay) that allowed them to win. During his fight with Sasuke, Tobi shows the ability to recover from what are presumably debilitating or fatal blows. After being slashed across the midsection by Sasuke's sword, Tobi collapses, only to stand up again a few seconds later and complain about the speed of the attack. Aside from this, Tobi has yet to demonstrate any techniques. Tobi has a very formal and correct manner of speech. While his physical appearance remains a mystery, Zetsu has implied that he is relatively young when one side of him referred to Tobi as a "good boy." He respects Deidara, referring to him as Deidara-senpai. Tobi's personality is rather odd in comparison with other Akatsuki members. While most of the members are dedicated and serious, though somewhat argumentative or even hostile towards each other when not fighting, Tobi is more carefree and goofy, much like Naruto. His personality does not please Deidara, who believes that all Akatsuki members should be serious and calm. Tobi unintentionally irritates Deidara frequently, which usually results in Deidara attacking Tobi in a comedic fashion. However, after Deidara and Itachi's death he is later seen and heard with a more serious and calm tone in his voice. The carefree side of Tobi is not seen again. Later Tobi claims to be Uchiha Madara, the founder of the Uchiha clan and first mangekyo sharingan user. He later changes his mask after obtaining the rinnegan to allow him to use both eyes simultaneously. In fourth ninja war, when he meets Naruto and Bee he says to be no one and that they could calling him Tobi, Madara or No One. In chapter 599 it is revealed that Tobi is actually Obito Uchiha who was teammates with Kakashi Hatake and Rin under the Fourth Hokage. Obito got his right side crushed when he saved Kakashi by pushing him out of the way of a rock slide. Unable to escape with his teammates, Obito had Rin implant his remaining Sharingan eye in Kakashi's damaged eye socket as a gift. After that it was believed that Obito died.
The Fourth Raikage's assistant acts as a go-between for the Raikage and Kumogakure's forces, giving them his orders and keeping him updated on their progress. She's a dark-skinned girl who is seen wearing a very formal attire during work hours, long earrings, and properly pulling her light-gray hair back into a bun except for the frontal part of it, which consists of two flat side bangs that fall along the sides of her face. (Source: Narutopedia)
Shibi is Shino's father. He is just as stoic as (if not even more so than) his son. He is a self-possessed figure, and the pride of Aburame. Shibi, like all members of his clan, has his eyes obscured by dark glasses which feature a single tassel hanging down from one-side. He has very spiky short black hair and a moustache. He typically wears a high collared outfit, while carrying a gourd on his back that is used for holding more kikaichū. He also tends to keep his hands in his pockets a lot, another trait he and his son share.
The Fire Daimy� has a fickle and indecisive nature and is easily swayed in his decisions through biases as well as external influences. When situations call for fast, important decisions, he makes his advisers do the whole work: the one who convinces him most is the "winner". He seemingly had a liking for Jiraiya, wanting to choose him as the next Hokage, and was also impressed by Kakashi Hatake's reputation. (Source: Naruto.wikia)
Background Amaru is a young girl who came from a village in the Land of Fire. When she was an infant, the Reibi was sealed into her to feed off the negative emotions of her surrounding villagers. Because of this, she became alone and shunned from social interaction with the people of her her village all her life. Later, she fell sick and was rescued by a kind doctor named Shinn�, who Amaru grew to idolize. After which, Amaru insisted for Shinn� to make her his student, to which he agreed. Naruto Shippūden 2: BondsAfter the infamous Sky Ninja decimated Konohagakure, Amaru arrived to aid in healing people alongside her sensei Shinn�. She quickly made it clear how much she admired her teacher. After helping with the injured, she and Shinn� were escorted back to their village by Naruto, Sakura, and Hinata. Upon arriving at the village, they discovered that it too was destroyed by the Sky Ninja. Horrified by the sight, Amaru accidentally triggered a trap that would have killed her had Shinn� not saved her at the cost of his own life. Wanting to make her sensei proud, Amaru joined Naruto in rescuing the villagers, which lead them to an old ruins that turned out to be the Sky Ninja's headquarters and mother ship. To Amaru's delight, she discovered that Shinn� was still alive. But her joy quickly turned to horror as Shinn� revealed that he was working with the Sky Ninja and that the kind man he appeared to be was a lie. He also revealed to have been the one who implanted the Reibi in her, so as to gather massive amounts of dark chakra. Falling into despair, she was given new hope from Naruto who convinced her that while Shinn� himself may have not believed in what he taught her, there is truth to valuing life. Amaru then went off to find and rescue the villagers that were locked up. When the mother ship began crashing from the sky, Naruto forced her to join the villagers in a smaller ship, but she chose to jump after Naruto to be there for him for a change. They fell from the sky and they were saved by Jiraiya summoning Gamabunta to cushion their fall. Retrieved from "http://naruto.wikia.com/wiki/Amaru"
Visual novel version When she was evacuating a village and met Kazuto, she was shocked to see the very "messenger from heaven" helping the people. She begs Kazuto to let her join his army, and he allows her to due to his knowledge that she was a master strategist. The third to join the group. She has a tendency to say "Hawawa" very often to the point of the being called the "Hawawa Strategist" by the soldiers. She also has a hobby of reading perverted books to discover new ways to please Kazuto. Anime version A shy, kind, and reserved girl around the same age as Rinrin, but is a smart, good strategist in battle. However, her naive and child-like nature often overshadows these attributes, and has been known to act on the same level of immaturity as Ch�hi. She wants to become a great scholar like her master Shibaki. The fourth to join the group. She was also trained in herbal medicine. In Shin Koihime she is revealed to have taken up her visual novel hobby of reading perverted books. (wikipedia.org)