koharu rikka is a japanese synth developed by TOKYO6 ENTERTAINMENT in collaboration with ah-software. she was released on 18 mar 2021, but her character birthday is today, as 16 may 2020 was when she was announced. she was originally intended to release for voiceroid 2 but this was scrapped in favour of cevio ai. she had banks for synthv studio, synthv ai, and cevio ai, all released on the same day. her vp is Yoshino Aoyama, and her illustrator is Nari Teshima. she is described as being a high school sophomore (15-16yo). she is 160 cm tall. her first live performance (Koharu Rikka 1st LIVE!) took place on 22 apr 2022 at Harevutai in Ikebukuro. her stuffed bear is called LAKISTON. she goes to school (Otaru Shiokaze High School) with chifuyu and natsuki karin, in which they are all members of the music club.