Mori Calliope (森 カリオペ) is a female English-speaking Virtual YouTuber associated with hololive, debuting in 2020 as part of hololive English first generation "-Myth-" alongside Ninomae Ina'nis, Takanashi Kiara, Watson Amelia and Gawr Gura.
Throughout a successful VTuber career spanning more than four years, Calli has released prodigous amounts of original music, including three original solo albums, more than twenty original singles and EPs, and numerous collaborations. In 2022 she became the third ever VTuber to reach 2 million YouTube subscribers.

"Dead Beats, listen up! Your Mori's been working hard for you!"
The Grim Reaper's first apprentice. Due to modern medical care causing a decline in the reaping business, Calliope decided to become a VTuber to harvest souls instead. It seems that the ascended souls of the people who are vaporized by the wholesome interactions between VTubers go to her as well.
That being said, despite the image her hardcore vocals and manner of speech gives off, she's actually a gentle-hearted girl who cares greatly for her friends.