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Karin is a former subordinate of Orochimaru, presumably 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 of the group.
Karin is infatuated with Sasuke since they first met; when he saved her during the Chūnin Exams. In the anime, she has a flashback of when Orochimaru sends her to assist Sasuke in capturing a horde of escaped prisoners. There, she is captivated by the level of Sasuke's chakra and develops an infatuation with him. Karin's infatuation bordered on obsession to the point of fanaticism. For example, when Hebi was recuperating after Sasuke's battle with Deidara, Karin was planning to drug both Suigetsu and Jūgo and then "ravish" Sasuke's unconscious body and it was later revealed that she had kept one of Sasuke's sweat-drenched shirts. Karin didn't make much of an attempt to hide her feelings, frequently suggesting to Sasuke that they should spend time alone. Karin was very angry when the Fifth Mizukage flirted with Sasuke, and called her an "old hag" for it. Despite Sasuke's chakra becoming increasingly "darker", she still found him attractive. However, after he stabbed her in order to kill Danzō and tried to kill her, then even order Sakura to kill her to test Sakura's intent to join him, Karin stated that she no longer cares about him. Karin has also used other's perception of her feelings towards Sasuke to her advantage, feigning mental instability while imprisoned at Konoha to make the guards pay less attention to her. Upon her escape, she furiously beat Suigetsu after following Sasuke's chakra, but with Sasuke's apology and Orochimaru's suggestion, she found herself unable to stay angry.
In Ultimate Ninja Storm 2, Karin's techniques are more focused on her personality, as she sprays poisoned perfume that she carries in the pouch on her back and slaps opponents with explosive tags. When fighting Sasuke, Karin's entire demeanour changes, and she frequently remarks and swoons over him while fighting, and her techniques and Awakening mode are modified.
Karin's hobby is collecting perfumes.