The Nico Nico Nii chant comes from Nico Yazawa, the idol-obsessed schoolgirl in Love Live! School Idol Project (2013), and it has soundtracked anime memes for over a decade. The kneecaps twist is pure internet: creators started pasting her sugary chant next to a gruff cartoon mobster voice shaking someone down, and the mashup blew up as a TikTok meme sound in the same vein as Emotional Damage Meme. The exact origin of the mobster voice is uncredited, but the bait-and-switch formula keeps it in rotation for fake threats and edits.