Kuromi is a Sanrio character known as My Melody's mischievous rival, recognisable by her black hood, pink skull and cheeky attitude. Online, that look has become shorthand for a cute-but-chaotic aesthetic, especially in TikTok edits, cosplay clips and fan art. The phrase 'do the Kuromi' fits that trend, turning the character into a pose, dance or attitude to copy rather than just a mascot to admire. As Kuromi's popularity has grown beyond Sanrio fans, the sound has become a quick signal for playful rebellion in short-form video.