Kei

Kei is a recurring character in the Sword Art Online series, is a supporting character in the Aincrad Arc and a reoccurring character through the Sword Art Online series. Kei is an Artificial Intelligence (AI), found by Kirito Ren Shuto and the Gang around the forests of the 22nd Floor of the floating castle Aincrad. His official name is «Kei-MHCP002» (Mental Health Counseling Program 002).