NIJISANJI

The Nijisanji group are 2D-only Virtual Youtubers (or "Virtual Livers" when posting to NicoNico) who stream via iPhoneX devices with face capture and Nijisanji's app. This is technically simpler and less expensive than full-body 3D-capture setup, but the technology has been noted to suffer some stuttering and accuracy issues.

There are currently around a dozen Nijisanji members in the Top 100 Virtual Youtubers, with Tsukino Mito having the highest number of subscribers.

Fanart with most, if not all, of the Nijisanji members can be found here