Yuuki Asuna

Yuuki Asuna is the main heroine and the partner of Kirito in the Sword Art Online series. She is known as Asuna the «Flash» the sub-leader of the Knights of Blood guild in «Sword Art Online». She is the daughter of the CEO of RECTO Progress. She's the wife of Kirito in-game and Kirito is her boyfriend in the real world.

Background
Originally, a studious and determined high-class daughter, she started playing SAO at a whim, wanting to play it before her brother. When she discovered all the players were trapped in SAO she held up inside her room in the Starting City for a week, before resolving to take fate into her own hands. This led her to kill monsters at an incredible rate and level up in a quick fashion.