Kizuna AI is a Japanese virtual YouTuber (VTuber) and fictional character currently part of Kizuna AI Inc., a subsidiary of digital entertainment company Activ8. From her debut in 2016 until 2021, she was the most subscribed VTuber on YouTube, with more than 4 million subscribers across three YouTube channels and 1 million subscribers on the Chinese video platform Bilibili. Kizuna AI posted her first YouTube video on her "A.I.Channel" on 29 November 2016. A second channel, "A.I.Games", was opened in March 2017 for gaming content, and a third, "A.I.Channel China", opened in June 2019 for a Chinese audience.