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 (김다희 Gim Da-hui), who was a member of the K-pop idol group, 'GLAM'. Dahee recorded in Korean and Japanese for the two voicebanks. On November 25th, 2022, Starlike Inc. an event and gaming development team, has announced that they would be licensing her and UNI.
A profile was written for her on the VOCALOID STORE. The profile stated "She dreams of being an idol loved not only in Asia but also in Europe as well".
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 were 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 is 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.