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Kasane Teto is a character created originally as a prank to trick NicoNico viewers into thinking Cryptom Media was releasing a new Vocaloid. Initially she was given only a visual appearance in a style to lend to the prank, but as time went on and she gained popularity, she was eventually given a voicebank under the free-ware spinoff software known as UTAU. To this day she is one of the best known UTAU characters and might even be liekened to UTAU's Hatsune Miku.

Some still even now mistake her for an actual Vocaloid.