Karin

Former subordinate of Orochimaru, a former kunoichi of Kusagakure, and a member of the Uzumaki clan. She assisted Orochimaru in his experiments, and was left in charge of his Southern Hideout while he was away. She was later recruited into Sasuke Uchiha's group Taka, which was initially called "Hebi" at the time of its creation, as the sensor and healer of the group. Ultimately, she and the rest of the world were freed from the genjutsu by Naruto and Sasuke after they ended the war. Karin's whereabouts after this are currently unknown. Karin is quite intelligent. During Hebi's hunt for Itachi, she was able to deduce that the Konoha shinobi's way of tracking them was by Sasuke's scent. From this, she quickly came up with a method of throwing them off Hebi's tracks, by tearing up Sasuke's sweat-soaked shirt and tying it to many birds and having them fly in multiple directions.

She was capable of quickly deducing the basics of a complex technique such as Izanagi during Sasuke's battle against Danzō. She is also resourceful, as seen during her imprisonment, hiding a blade in the frame of her glasses as well as a lock-pick set within a portrait that she seemingly carries around with her, all the while putting up an act of fluctuating feelings for Sasuke in order to lessen the guards' sense of security on her. As a direct descendant of the Uzumaki clan, Karin has a remarkably powerful life force. This grants her a potentially immense longevity as well as equally strong vitality. As noted by Kabuto, Karin also possesses a unique healing ability which seemingly stems from this powerful life-force. With this power, she not only has incredible regenerative capabilities, by biting herself and consuming some of her own chakra she can heal most injuries, and can heal others by letting another person bite her. The potency of her healing chakra was enough to restore Tsunade's chakra reserves. However, it is dangerous for her to use that ability more than once a day, and as a consequence, she is left with permanent bite marks on her arms, chest and neck. She can also use this ability to heal herself by biting herself.