Yuuki Asuna

, known as in «Sword Art Online» (SAO), «ALfheim Online» (ALO), as well as «Project Alicization», where she had temporarily used the  account, is the main heroine of the Sword Art Online series, the deuteragonist of the Aincrad Arc, as well as the protagonist of the Mother's Rosario side story. She is the daughter of the former CEO of RECT Inc.. Asuna was one of the 10,000 players trapped in «Sword Art Online», where she was the sub-leader of the «Knights of the Blood» (KoB) guild. Her skills with the rapier had her earned her the nickname «The Flash» (閃光, Senkō).

She is voiced by Tomatsu Haruka in the anime adaptation of Sword Art Online.

Background
Asuna lived a comfortable life in her large home in Setagaya with her mother, father, and her brother. She originally went to private, all-girl schools before the events of SAO.

On November 6, 2022, Asuna logged onto SAO after she borrowed her brother's NerveGear. He had acquired a copy of the game and a NerveGear through his connections but could not play the game on the opening day due to a sudden business trip. When she discovered that she and all of the players were trapped in SAO, she secluded herself inside of her rented room in the «Town of Beginnings» for two weeks before resolving to take her fate into her own hands. This led her to kill monsters at an incredible rate and level up in a quick fashion, even risking her life in the process.

Appearance
Asuna has long, orange-brownish chestnut hair and hazel eyes. In the early levels of SAO, she wore a dark red leather tunic with a lightweight copper breastplate and leather pants with boots up to the knees along with a hooded cape. After joining the «Knights of the Blood», she wore a red and white uniform that all KoB members wear and wielded a rapier made by Lisbeth, called the «Lambent Light». After the Ordinal Scale Incident, Asuna started wearing the promise ring given to her by Kazuto on her left ring finger.

Asuna's avatar as Stacia, the Goddess of Creation, maintains her chestnut hair and light brown eyes. She wears a pearly-white breastplate and a long skirt consisting of countless fine fabrics.

Trivia

 * Asuna appears as a playable character in Dengeki Bunko: Fighting Climax.
 * Asuna appears as a main and support character in Dengeki Bunko: Crossing Void. The Game also features her as a playable character in an alternate costume (Kimono Asuna).
 * Asuna placed second in the Top 10 Female Characters in the Kono Light Novel ga Sugoi! 2012 and 2013 awards and third in 2014. She placed sixth back in 2011, and fourth in 2015.