Kirigaya Kazuto (桐ヶ谷 和人, Kirigaya Kazuto), born as Narusaka Kazuto (鳴坂 和人なるさか かずと, Narusaka Kazuto), and known as Kirito (キリト, Kirito) in «Sword Art Online» (SAO), «ALfheim Online» (ALO), «Gun Gale Online» (GGO), and «Project Alicization», is the protagonist of the main Sword Art Online series.
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Yuuki Asuna (結城 明日奈, Yūki Asuna), known as Asuna (アスナ, Asuna) in «Sword Art Online» (SAO), «ALfheim Online» (ALO), as well as «Project Alicization», where she had temporarily used the Stacia (ステイシア, Suteishia) 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).
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Yui (ユイ, Yui), officially named «Yui-MHCP001» (Mental Health Counseling Program 001), is a supporting character throughout the Sword Art Online series. She is a top-down Artificial Intelligence (AI) program that was originally developed by Argus to address player mental health concerns in Sword Art Online (SAO). However, when Kayaba Akihiko turned Sword Art Online into a death game, Yui was forbidden from interfering with players whatsoever by the Cardinal System, which led to her collapsing due to being forced to monitor player mental health without being able to fulfil her duties. Found in this broken state by Asuna and Kirito around the forests of the 22nd Floor of the floating castle Aincrad, she was mistaken for a lost child player and adopted by the couple. After recalling her actual identity in a Hidden Dungeon on the 1st Floor, Yui ignored the Cardinal System's orders and exercised her Game Master rights to save Asuna and Kirito from The Fatal Scythe, which led to her being flagged for deletion by the system. Before this could happen, Yui's program files were separated from the system, converted into an in-game object, and stored in Kirigaya Kazuto's (Kirito's) NerveGear. After Sword Art Online was cleared, Yui's data was imported into ALfheim Online along with Kirito's account due to the game being based on the data from Sword Art Online's servers. In ALfheim Online, Yui is treated as a Navigation Pixie by the game's system, granting her access to the game's database. After the Fairy Dance Arc, Yui's data was moved outside of Kazuto's NerveGear, granting her access to devices outside of games.
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Tsuboi Ryoutarou (壷井遼太郎, Tsuboi Ryōtarō), known as Klein (クライン, Kurain) in «Sword Art Online» (SAO), «ALfheim Online» (ALO) and «Project Alicization», is a supporting character in the Aincrad Arc and a reoccurring character through the Sword Art Online series. He was one of the 10,000 players who were trapped in Sword Art Online, where he was the guild leader of «Fuurinkazan», one of the clearer guilds. After Sword Art Online was cleared, he began playing ALfheim Online as a Salamander.
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