Mori Calliope is a virtual YouTuber and member of the talent agency Hololive Production. She debuted in September 2020 as part of the agency's English-speaking branch, known as Hololive EN. Mori is characterized as a "reaper" and often incorporates themes of death and the afterlife into her content, which includes music, gaming, and chatting streams. As a musician, Mori Calliope has released original songs and albums, showcasing her skills in rap and singing. Her unique blend of anime aesthetics and Western music styles has garnered her a significant following. She is known for her distinctive voice and engaging personality, making her a popular figure in the virtual streaming community.