Rubii is a virtual ninja that creates videos as a Virtual YouTuber. Videos consist of a variety of content including teaching, gameplay, and memes, with recent content being released in a shorter format. Rubii also has an uncontrollable habit of speaking Japanglish (a hybrid of Japanese and English).
Rubii was a virtual ninja that was nearing her scheduled termination and chose to spend her final days aspiring to become a VTuber and make a video. Unable to properly record herself in the end due to the emotional strain, she uploaded a video using a practice recording she made with her friend, Kokahu, and passed on her channel as her final gift. Now Kohaku runs the channel but keeps Rubii's name and general appearance in honor of her memory.