Yagoo is the nickname for Motoaki Tanigo, the founder and chief executive of Cover Corporation, the company behind the virtual YouTuber agency Hololive. His warm Hello Everyone greeting became familiar to fans through Hololive concerts, streams and announcements, where he often appears to thank viewers and introduce new projects. Clips of the greeting spread through fan edits, reaction videos and social media, where it took on a second life as a wholesome meme. It remains popular because it instantly signals Hololive fandom and a friendly, welcoming tone.