Usada Pekora debuted in 2019 as part of Hololive Production's third generation of Japanese VTubers, Hololive Fantasy. The rabbit-eared streamer quickly became known for prank-filled games, loud reactions and a distinctive laugh she uses when teasing chat or celebrating a win. Clips of the ha ha ha were cut from her livestreams and shared across YouTube, TikTok and soundboards as a standalone reaction. Because it is instantly recognisable even without video, editors keep using it as shorthand for smug, chaotic anime humour.