Yuuki Asuna

Original : Yuuki Asuna
Japanese : 結城明日奈
Synonym : Asuna ( アスナ ), Erika, Queen Titania
Age : 18
Height : 168 cm
Weight : 55 kg
Voiced By : Tomatsu Haruka (Japanese), Cherami Leigh (English)

Asuna is a heroine and the partner of Kirito in the Sword Art Online series. She is the sub-leader of the «Knights of the Blood» guild in «Sword Art Online». Her real name is Yuuki Asuna, and she is the daughter of the former CEO of RECTO Progress Inc.
Asuna originally didn't care about dying in the game, before meeting Kirito. That meeting drastically changed Asuna's personality and outlook on life. She soon takes most things Kirito says to heart and looks to him for help, using him as somewhat of a lifeline. She acts as a tsundere towards him for most of Volume 1, even when married. Asuna is a kind and helpful young woman, who is similar to Kirito, cannot abandon another in trouble. She takes the game very seriously and is very focused on clearing it, before Kirito tells her to enjoy SAO a bit. Asuna is also somewhat proud and is not afraid to get physical with those that challenge her authority or brag about her abilities such as Cooking. She even challenged Kirito to a duel after an argument over how to handle a Floor Boss. She isn't afraid to act out on her own and will take matters in her own hands from time to time. Asuna, once again similar to Kirito, is someone who can be controlled by her emotions many times. This is best shown in moments with Kirito where she jumped in front of an attack meant for him by Heathcliff and appeared to be killed. She also can't handle the deaths of others well and will lose control, attacking The Gleam Eyes after seeing the Liberation Army get slaughtered. In ALO, after being saved by Kirito, Asuna's personality hasn't changed a bit except she's not as proud as she was in SAO. Her personality begins to develop further after meeting Yuuki. Seeing how, despite knowing she will die, Yuuki can still move forward, Asuna takes after her and resolves after her new friend's death to keep moving forward. She is also either dense to the fact that other girls having feelings for Kirito, or she knows that Kirito is only in love with her, and so it doesn't bother her.