Yui-MHCP001

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...

Yui 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. When she finally, after nearly two years of only seeing insanity, misery, and anger, noticed a couple, expressing happiness and joy, s...