Yui

ユイ

A young and cheerful girl with long black hair who looks no older than 10 years old. Kirito and Asuna found her in a forest on the 22nd floor of Aincrad. Her true identity is actually a players' self-regulation program for mental maintenance, Mental Health Counseling Program or MHCP. After being forbidden by the game master Akihiko Kayaba to come close to the players at the beginning of the death game, she was flooded with errors and broke down. In the process she became an AI that possesses actual intelligence. When the Cardinal system governing Sword Art Online decided to erase her, Kirito…