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Kasane Teto

Kasane Teto is a Japanese virtual singer character and voicebank originally created as an April Fools’ Day parody of Vocaloid culture in 2008.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Kasane Teto is a Japanese virtual singer character and voicebank originally created as an April Fools’ Day parody of Vocaloid culture in 2008. She first appeared as an UTAU voicebank and later gained official voice databases for other singing-synthesis platforms, becoming a popular figure in the vocal synth community.

Origins

Kasane Teto originated as an April Fools’ Day prank on the Japanese textboard 2channel, intended as a spoof of a new Vocaloid release. The joke later developed into a real fan-supported voicebank and character.

Voice and design

The character’s voice is provided by Oyamano Mayo, and Sen is credited with the illustration/design associated with the original character. Teto’s name is written 重音テト and the character is commonly presented as a virtual singer.

Software releases

Teto first appeared as an UTAU voicebank in 2008. She later received an official AI voice database for Synthesizer V in April 2023, with a further update for Synthesizer V Studio 2 reported in 2025.

Reception and popularity

Although created as a parody, Kasane Teto became popular among Vocaloid and vocal-synthesis fans. Her character has been used in fan works, original songs, and merchandise such as figures.

Key facts

  • Kasane Teto began as a joke “new Vocaloid” announcement posted for April Fools’ Day in 2008.
  • She was first developed as an UTAU voicebank rather than an official Vocaloid voicebank.
  • Her voice provider is Oyamano Mayo, and the character design is credited to Sen.
  • Teto later received an AI voice database for Synthesizer V in 2023.
  • She is widely regarded as a parody character who became popular in her own right.

Frequently asked questions

Is Kasane Teto a Vocaloid?
No. She originated as an UTAU voicebank and parody character, although she is often discussed within the broader vocal synth community.
When was Kasane Teto created?
She was created as an April Fools’ Day joke in 2008.
Who voices Kasane Teto?
Kasane Teto is voiced by Oyamano Mayo.
Who designed Kasane Teto?
The original character illustration is credited to Sen.
What software is Kasane Teto associated with?
She is associated with UTAU and later Synthesizer V, and is also mentioned in connection with OpenUtau.
Why is Kasane Teto notable?
She is notable for starting as a parody of Vocaloid culture and later becoming a widely recognized fan-favourite virtual singer.

References

  1. Vocaloid Wiki - Fandom — https://vocaloid.fandom.com/wiki/Kasane_Teto
    Supports: Describes Kasane Teto as a Japanese and later English UTAU originally created as a troll Vocaloid by fans.
  2. Wikipedia — https://en.wikipedia.org/wiki/Kasane_Teto
    Supports: Summarizes her April Fools’ Day 2008 origin, later real voicebank release, and status as a virtual singer.
  3. SynthV Wiki - Fandom — https://synthv.fandom.com/wiki/Kasane_Teto
    Supports: States that she was released for Synthesizer V in April 2023 and updated for Synthesizer V Studio 2 in November 2025.
  4. kasanete.to — https://kasanete.to/
    Supports: Presents Kasane Teto as a fictional VOCALOID-inspired character with UTAU and SynthV-related releases.