Kizuna AI, a Japanese virtual YouTuber who debuted in 2016, opens her videos with the greeting Hai Domo, short for a cheerful hello from a virtual YouTuber. The catchphrase became closely tied to her energetic persona and to the early VTuber boom, spreading through clips, fan edits and reaction videos as virtual creators grew in popularity. Because the greeting is brief, bright and instantly recognisable, creators still use it as a nostalgic anime intro and a quick signal of VTuber fandom in short-form content today.