Kasane Teto

Kasane Teto is officially stated to be 31 years old. In her earliest design, she was tall and weighed . She is listed as liking baguettes (which she is frequently depicted with in fanart) and having a tsundere personality. ==History==

Creation Kasane Teto's origins come from 2channel, a Japanese bulletin board. In 2008, a group of users devised a plan to make a fake Vocaloid character. Character names, hairstyles, genders, ages, likes, dislikes, special skills, and other traits were randomly selected from among the suggestions of 2channel users and consolidated into a single character, which would be shown as a prank for April Fools' Day. On 6 April 2008, she appeared for the first time on video, and on 13 April 2008, the first voicebank for Teto was released, with Oyamano Mayo as the voice provider. The first song using her voice was released on 1 June 2008. In 2013, she appeared as a part of Hatsune Miku's act in the Sapporo Snow Festival. Synthesizer V software For the 15th anniversary of Teto on 1 April 2023, Japanese software developer AH-Software announced they would be partnering with Twindrill and Crypton Future Media to produce a Synthesizer V AI voice database for the character, its first full commercial release. On 3 April 2023, Kasane Teto AI version 104 was announced. For the occasion, a significant redesign was made, giving Teto a new outfit to stand apart from being a Hatsune Miku parody. The deep learning technology in Synthesizer V made use of singing from the voice provider rather than concatenative phoneme samples like UTAU. This allowed for cleaner, more natural synthesis and various features such as "vocal modes" for expression and the ability to sing in any language that Synthesizer V AI supports via "cross-lingual synthesis". Synthesizer V AI Kasane Teto was released on 27 April 2023, and has received frequent updates. A limited "lite" voice database for the same software was released soon after on 8 May 2023, available for free download. On 30 October 2025, AH-Software announced a Kasane Teto voice database for Synthesizer V 2 AI, which was released on 27 November 2025. VOICEPEAK For Teto's 17th anniversary on 1 April 2025, AH-Software announced an adaptation of Kasane Teto's voice for their Japanese text-to-speech software, which was released shortly after on 24 April 2025. Voicebanks ==Reception==

of Kasane Teto Despite not being a Vocaloid character, Kasane Teto has gained popularity among Vocaloid and UTAU fans. Within six months of her release, more than 500 videos with the "Kasane Teto" tag were published on Niconico, and the song "" (Japanese: , ) featuring Kasane Teto reached 100,000 views, entering the Vocaloid Hall of Fame. According to stats from the 2025 Music Awards Japan, 5 out of the top 10 most popular Vocaloid tracks in Japan featured Kasane Teto, notably surpassing Hatsune Miku who was featured in 3. Among songs nominated for the 2025 Best Vocaloid Culture Song award, Teto was the second most used voice behind Miku. Tetoris by Hiiragi Magnetite reached 105 million views, being the first and only solo Kasane Teto song to reach over 100 million views on YouTube. Notable songs Other media Kasane Teto has appeared in many different media, such as in Sega's music game franchise Hatsune Miku: Project DIVA, becoming a promotional character for Hokkaido Broadcasting, having Nendoroid and other plastic figures from Good Smile Company, performing with Nakamura Shidō II on the Kabuki stage, and having novel adaptations. ==Notes==