Mori Calliope debuted in 2020 as part of Hololive English Myth, building a following for her rap, singing and dry humor as a reaper VTuber. Gigi Murin later joined Hololive English in 2024 as part of Justice, and clips of senior members calling out her name quickly circulated among fans. The short shoutout became a reusable reaction sound on soundboards and in fan edits, valued because even listeners outside the fandom recognize the cheerful name call and its inside-joke energy without needing context.