Sword Art Online Forever

Kirigaya Kazuto was adopted by his aunt and uncle a year after his birth when his biological parents died in an accident. Raised by his foster parents as a son, he originally  trained with his cousin in the neighborhood kendo dojo under thier grandfather's tutelag. Due to his aunt's influence as an editor for computer systems magazine, Kazuto fell in love with computers and dropped kendo after two years.

 Kazuto has immense skill as a programmer, managing to build a computer from parts during elementary school, finding his erased records in the national registry at the age of ten, as well as managing stop the SAO server from deleting Yui by converting her program into an object and storing her into his NerveGear as environmental data.

He Currently lives at Kawagoe City in the Saitama prefecture with his family, adopted by his aunt and uncle after his parents died, though his uncle is often not around. he was raised as thier son with his cousin as his sister. He was originally trained in kendo by his grandfather but had little interest in it and as a result his sister began to cover for him 

Epithet : The Flash

Age : 15 (Beginning of Aincrad Arc)

         17 (End of Aincrad Arc, Fairy Dance Arc)

Birthdate : September 30, 2007

Gender : Female

Asuna lives 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.

She logged onto SAO after she borrowed her brother's NerveGear. He was one of the people who waited in line for the game's release, but due to a sudden business trip, could not play on the opening day. when she discovered that she and all the players were trapped in SAO, she secluded herself inside of her rented room in Starting City for a week 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 proces. it also earned her title The Flash for performing an astounding Linear

she is the wife of Kirito in-game and his girlfriend in the real world.

Epithet : Program

Age :  Unknown and will always be 

Birthdate : Unknown and will always be 

Gender : Female

Yui is the first version of the Mental Health Counseling Program of Sword Art Online. She is a Top-down AI made to monitor the mental health of the players of SAO. She was made to be able to mimic emotions and be able to interact with the players of SAO.

 During the events of SAO she become self-aware and fully realized artificial intelligence built form a program atop an existing computer architecture, which is why she usually appears in programs based on SAO. Top-down AIs can be considered as a cluster of binary.

She later gains Access to the real world though a VR probe (Audiovisual Bidirectional Communication Probe) designed and created by Kazuto

Her core program runs and is stored on kirito's NerveGear local Memory, and is about 3TB large

Epithet : The Strongest Man

              The Living Legend

Age : 28 (End of Aincrad Arc)

Birthdate : 1995-1996

Gender : Male