teto
Kasane Teto

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Teto" refers to "Kasane Teto," a Japanese character originally created as a fan-made "troll Vocaloid" on 2channel, a Japanese bulletin board, with the intention of pranking people into believing she was a real Vocaloid release; she became popular despite her origins as an April Fool's joke, and is now considered a well-known UTAU (a type of vocal synthesizer) character, often depicted with a cheerful and slightly mischievous personality.
Key points about Teto's story:
Origin as a prank:
Teto was created on 2channel as a fake Vocaloid character with randomly generated traits like her name, appearance, and personality, intended as a joke to trick people on April Fool's Day.
Utau development:
Despite being a joke character, fans quickly embraced Teto and developed a voicebank for her using the UTAU software, allowing people to create songs with her voice.
Character traits:
Teto is often portrayed as a playful, energetic character with a slightly "tsundere" personality, meaning she might act indifferent but secretly cares about others.
Twindrill team:
The creators behind Teto's design and voicebank formed a group called "Team Twindrill" to manage her character and promote her usage.
Impact on Vocaloid culture:
Although not an official Vocaloid, Teto gained significant popularity within the Vocaloid community and even appeared in some semi-official Vocaloid media like Project DIVA. (and yes i got this from Google don't mind me y'all bye for now)