Arya Stark wields this thin sword given to her as a child by Jon Snow. The sword fits Arya's petite frame and allows for a level of agility unmatched by the heavy slashing motions of a standard sword. Arya first used Needle to learn the Water Dance style of fencing popularized in the free city of Braavos. This technique emphasises speed along with quick thrusting attacks.
While Arya has had much success with the weapon such as killing the Waif in the sixth season, Needle doesn't rank high as a power weapon, especially against foes as daunting as the White Walkers.