Tohoku Zunko (東北ずん子) is a Japanese VOCALOID developed and distributed by AH-Software Co. Ltd., and was created in collaboration with SSS Co., Ltd.. She was released in June 2014 for the VOCALOID3 engine. She is also sold as a VOICEROID+. An update to the VOCALOID4 engine was released in October 2016.
Her voice is provided by the Japanese voice actress, singer, and narrator, Satomi Satō (佐藤聡美; Satō Satomi), who is known for her role as Ritsu Tainaka from the Japanese music anime "K-ON!".
Zunko is a high school student in her 2nd year. Her birthday is October 27.  Her special ability is "Zunda Arrow" which transforms any kind of mochi into zunda-mochi.
Her hobbies are archery and making cakes, particularly zunda-mochi. Her dream is to own her own "Zunda Café" in Tokyo as well as a "Zunda Shop" in Akihabara. This was mentioned in a short bio that was included in her strap.
Tohoku Zunko's VOCALOID software began development after a successful crowdfunding campaign. 2 similar events occurred for her sisters Itako and Kiritan to be released for Vocieroid, both were also successful.