The line comes from Hololive English VTuber Nanashi Mumei of Council, known for her soft voice and whimsical humor. The phrase riffs on the Moomins, the round, gentle creatures from Tove Jansson's beloved children's books, turning their cozy image into a playful identity. Clips of Mumei's streams circulate widely among Hololive fans, and short declarations like this one get picked up for soundboards because they are instantly quotable. It endures as a wholesome in-joke, signaling a shift into soft, comfortable, unapologetically cute mode.