Debut date Nov 28, 2021 Height 153 cm Fanbase name Koyori no joshu-kun Illustrator Momoko Generation 6th Gen (holoX) Hakui Koyori is a female Japanese Virtual YouTuber associated with hololive. YouTube | Profile | Twitter | Twitch | TikTok The one in charge of R&D in Secret Society holoX. As part of her studies into human behavior, she meddles in the other members' affairs and tries to help them out at every turn. Possessed by an insatiable thirst for knowledge, she may sometimes also deliberately mess with people just to see how they react. The self-proclaimed "brains of the operation." Her areas of expertise, however, are pretty limited.