Rio is a forgotton Vocaloid. Rio was featured in the game Hello Kitty to Issho! with several other characters. But she shares some traits with other Vocaloids, as she was illustrated by KEI, just like Hatsune Miku and Kagamine Rin/Len. Iroha Nekomura was the Vocaloid designed for Hello Kitty to Issho!, but many people had assumed it was Rio at first.