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The finale of Book 2 had Tenzin stress that being the Avatar wasn't all there is to Korra, but that lesson didn't quite stick through Book 3, since she's been identifying herself as the Avatar since she was four, and it's hard for someone to move past that easily. After she gets in touch with Raava again she realizes she was being a jerk and apologizes.
Acquired Situational Narcissism: Catches a bit of this at the start of Book 2 when she becomes convinced that she has already mastered airbending and dismisses Tenzin's teachings because she defeated Amon. Tenzin: Korra, you've managed to transform the world more in a few years than most Avatars did in their lifetimes. Tenzin lampshades how much of an Ace she is in the series finale. While she started out with an extreme lack of spirituality, she ultimately developed a stronger spiritual link than even Aang, who excelled at that. Korra is also a highly proficient unarmed fighter, able to defeat several chi blockers before being rescued by Naga. In addition to bending, Korra has considerable physical prowess, enough to easily lift Tenzin and his children at the same time. She's also learned numerous sub-skills, most of which she picked up within days: healing, spiritual waterbending, metalbending, and energybending. Korra learned to bend three of the four elements without any training by the age of four, and picked up airbending incredibly fast once she got over the spiritual block that prevented her from using it.
The Ace: Even more so than Aang, or most known Avatars for that matter:. '20s Bob Haircut: Sports a messy version of this in Book Four after her Important Haircut during the three year Time Skip. In the Book 2 finale, she is able to tap into the cosmic energy of the universe and project her spirit as a giant blue phantom who can take on Vaatu/Unalaq. Then she gains the power to restore the bending of Amon's victims. 11th-Hour Superpower: Airbending at the end of Book 1.