Yui (Sword Art Online)

Yui, also known as Yui Kirigaya and Yui-MHCP001, is one of the main characters from the Sword Art Online series.
== Charactah Account ==
Yui is an AI in SAO created to take care of the mental health of the players but was suspended by the Cardinal system when the death game began. Unfortunately her monitoring operations continued and sensed the negative emotions such as fear, despair, rage, and madness from the players. Unable to perform her duty due to her restriction, she broke down due to errors. When she sensed Asuna and Kirito's more positive emotions, she was overcome with the urge to see them, which then kicked off the events of Morning Dew Girl and later made her their adoptive daughter.
As Yui was originally a girl without memories, she felt insecure about not knowing who or where her "parents" were. This led her to assume that Kirito and Asuna were her parents. After the couple decided to play along as the girl's parents due to the girl's psychological condition, she became cheerful and shows great affection for her so-called "parents". According to Asuna, her behavior was like that of a baby despite her child-like appearance. However, she lacked any sense of fear, regardless of the intensity of the danger she might be in and even showed signs of rebellion and recklessness when Kirito told her that she had to stay with Sasha when he and Asuna wanted to go to a dungeon to rescue Thinker.
After Yui regained her memories, she told her in-game parents that she had become melancholic when the death game began, as she was not allowed to comfort players and was forced to continue monitoring their psychological parameters. After nearly two years of only seeing insanity, misery, and anger, she finally noticed a couple, Kirito and Asuna, who showed happiness and joy and, even though she was not allowed to interact with players, she continued monitoring them and even came to the forest near their home to be close to the two to experience their emotions. After being comforted by Kirito and Asuna, she regained her joy. Even though she was about to be deleted by the Cardinal System, Yui showed no sign of repentance, but tears of happiness, for she was able to be with her in-game parents. 
== Appearance ==
=== Anime ===
* Sword Art Online
* Sword Art Online II
* Sword Art Online II: Sword Art Offline II
* Sword Art Online Movie: Ordinal Scale
* Sword Art Online Movie: Ordinal Scale - Sword Art Offline
* Sword Art Online: Alicization
* Sword Art Online: Alicization - War of Underworld
* Sword Art Online: Alicization - War of Underworld 2nd Season
* Sword Art Online: Alicization - War of Underworld Reflection
* Sword Art Online: Extra Edition
* Sword Art Online: Sword Art Offline
* Sword Art Online: Sword Art Offline - Extra Edition
=== Light Novels ===
* Sword Art Online
* Sword Art Online SS: Caliber SS (Failure Side)
* Sword Art Online: Celeste no Yousei
* Sword Art Online: Material Edition
=== Manga ===
* Sword Art Online: Aincrad Night of Kirito
* Sword Art Online: Calibur
* Sword Art Online: Fairy Dance
* Sword Art Online: Kirito's Gun Gale Wars
=== Video Games ===
* Dengeki Bunko Fighting Climax
* Sword Art Online: Fatal Bullet
* Sword Art Online: Hollow Fragment
* Sword Art Online: Hollow Realization
* Sword Art Online: Infinity Moment
* Sword Art Online: Integral Factor
* Sword Art Online: Lost Song
* Sword Art Online: Millennium Twilight
* Sword Art Online: Variant Showdown
== Trivia ==
* Yui was originally supposed to monitor players as depicted in the opening sequence for the Aincrad Arc.
* Yui is also capable of accessing search engines and computer networks. Her thought processes are extremely effective, having an extraction rate of 95% of useful data.
* Yui thinks that Kirito's most annoying habit is him napping anywhere and everywhere, as she gets sleepy from them too.
* Yui enjoys communicating with Pina, as the familiar's intelligence is of a complex structure.
* Although Yui would like a younger brother or sister, so that she would have someone to talk to, she also wishes to monopolise her Papa and Mama.
* Yui is able to reproduce her original body in ALO, but only uses it when sleeping together with Kirito and Asuna, as her pixie body is more comfortable in many ways.
* Yui is able to hear other player's alarms.
* Yui's interest is breaking through firewalls.
* Yui disliked Kirito's spiky hair in ALO, as it was hard to sit on, thus on June 23, 2025, she had him change his hairstyle to his usual one.
* In the non-canon game adaptation, Hollow Fragment, Yui displays her sewing skills by making swimwear for herself, Asuna and Kirito.
* Yui appears in one of Asuna's win poses in Dengeki Bunko Fighting Climax where she runs up to Asuna and hugs her.
== Gallery ==
File:Yui (Sword Art Online) Render 01.png
File:Yui (Sword Art Online) Render 02.png
File:Yui (Sword Art Online) Render 03.png
File:Yui (Sword Art Online) Render 04.png
File:Yui (Sword Art Online) Render 05.png
== External Links ==
* Yui at Sword Art Online Wiki
Category:Characters
Category:Females
Category:Sword Art Online