Kasane Teto (重音テト?) is a character in Hatsune Miku: Project DIVA. Unlike the other characters, she is neither a Vocaloid character nor a derivative but rather, she hails from UTAU, a free singing synthesiser software similar to the commercially-released Vocaloid.
Teto made her debut in the series in Hatsune Miku: Project DIVA 2nd as DLC although she used Hatsune Miku's voice responses, making her technically a Hatsune Miku Module. Her later appearances do not depict her having a voice.
- Kasane Teto at the Vocaloid Wiki