Hanatan is one of the most well-known utaite of all time. She is famous for her works with vocaloid producers such as kikou or yuyoyuppe and also her touhou doujin songs as cordelia or yurica.

She has already been ahead of her time and her giggles are said to have the power to cure cancer.
https://youtu.be/4A3Jam_MYj4

Please watch her debut today Jan 14, 21 JST.
https://youtu.be/0c62htyEVtE