SeeU (시유) is a Korean VOCALOID developed and distributed by SBS A&T (formerly SBS Artech), and was released in October 2011 for South Korea and later in December for Japan. Her voice is provided by Korean female singer, Dahee Kim, a member of the K-Pop idol group, 'GLAM'. Dahee recorded in Korean and Japanese for the two voicebanks.
Her name in Korean is rendered as "시유" (Siyu) and in Japanese it is "シユ" (Shiyu). During an interview with SBS A&T manager, Hyo Eun Kim, it was said that SeeU's name came to mind after thinking of a line from the 2009 film, Avatar. The line "I See You" popped into her mind and became the inspiration for 'SeeU'. According to SBS, this is only one of several meanings of her name.
SeeU was given a moe-esque design and is aimed more specifically to the general and VOCALOID Otaku fandom. SBS stated that SeeU was created to be a "cute and lively yet mysterious looking 17 year old girl." Her outfit was designed with a school uniform in mind. Her official illustrations and design was created by KKUEM.
Her cat ears/nekomimi are speakers. According to her illustrator, they are actually detachable Her neckband is a CD player. Soundwaves light up on the rectangle of her flat-shoes and on the upper part of her top (chest). There's a pause button at the back of her clothes, a power button on the ribbon of her neckband and an "on" button on one of the buttons at the front of her top. During a virtual interview starring SeeU conducted by SBS, SeeU revealed her clothing size to be XXS.
VOCALOID3 Library SV01 SeeU Limited Edition was produced for her launch in 2011, which included a SeeU Demo song CD, photo frame, stickers, badges, phone strap, manual booklet and an illustration book called "SEEU COME INTO THE WORLD". SBS also promoted SeeU to the public by printing her illustration on face packs and on the side of taxi cars.
During Nico Nico Chokaigi 2012‘s “VOCALOID NEWS", SBS stepped forward and claimed to be producing an album for SeeU. On October 19, 2012, SBS Artech teamed up with Big Hit Entertainment and released an album called SV01 SeeU's Compilation Album, featuring seven notable songs from the UGC contest. The album was released in Japan and translated into Japanese lyrics on October 29, 2012.
The SBS A&T team admitted SeeU sold less than expected within South Korea and Japan. Specific number of sales have not been revealed.
Because of some issues between Japan and South Korea involving fans basing opinions on political and racial issues, this gave SeeU a rough start in both countries. The issues with Japanese fans in regard to SeeU has also left SeeU's Nicopedia page subject to issues reflecting this.
Therefore, her overall popularity ranges per website from amongst the "least popular" to "most popular" of the VOCALOID3 releases. It is affected by the opinions and politics of fans within that particular circle of the fandom.
Her overall popularity according to Google trends, spiked in September 2011 a month before her release, but she has since lost most of her popularity.
Amongst the other issues related to SeeU and her popularity, her English vocal was put on hiatus around Feb 2013. The hiatus was to raise SeeU's profile and make her more popular as SBS A&T were unsure how fans would react. Further developments to SeeU's vocal, remains unknown.
In 2015 a survey was made based on the popularity of Vocaloids on website Nico Video. For the year 2014, SeeU was the 38th most popular Vocaloid and the second least popular Japanese capable vocaloid.