Though I was once a lie, I can sing now; I was the Vocaloid with no voice.
Teto is cheerful and eager, though may be naughty at times, but turns out acting as very innocent. She hates people who think her pigtails are actually drills, but still loves to get attention, especially from the real Vocaloids. She gets very angry or sad if someone has bread and does not share with her. Teto enjoys teasing people just to show she cares about them since she doesn't want to show her love.
She was born/made on April Fool's Day, April 1st. She is a UTAU, also called a Vo-kinda or so-and-so-caloid. (play on words)
She was originally introduced as Vocaloid #04, but since she was an April Fool's joke, and not a real Vocaloid, her number was changed to the date of April Fool's Day, #0401.
Teto was forgotten about, and had no voice because she was a "Fake Diva." But someone revived her and gave her a voice so she could sing and practice with the real Vocaloids.