Haiyi (海伊) is a Chinese Synthesizer V voicebank developed by Beijing Photek S&T Development Co., Ltd.. She is part of the Medium⁵ cast. She was released on September 6, 2019.
Quadimension distributed a postcard featuring Haiyi with a description written by ATDan on the back. According to ATDan, "Haiyi was born by sea. The waves and marine animals tell the story of the girl who was born of the sea. The Metatron's Cube symbolises the relationship between Haiyi and water, the gem on her necklace is of the same space.
This girl doesn't just look like the sea, her voice is like the water too: gentle and elegant. A sound like water, an appearance like the sea".
For Haiyi's logo, a shape known as the icosahedron is present next to her name and is part of the last three strokes in the "海" character. In the spiritual meaning of Metatron's Cube, the icosahedron represents water, which influenced her design, name, and concept.
In March 2019, Haiyi was revealed to be part of the Medium⁵ cast and was one of the girls who derived from a single being known as ZERO who possessed Metatron's Cube. She was listed as a Cancer sign.
Hǎi (海) means "ocean" or "sea". Yī (伊) may translate to "she" or "her".
Haiyi’s design follows an ocean theme. Her color scheme consists of light and dark blues, whites, and pinks. She wears a jellyfish on the left side of her head.
ATDan explained that because Haiyi was born by the sea, he designed her with clear blue hair and eyes (mentioning that the sea gave them to her). Her clothing was based on the outfits worn by ice skaters and her shoes signified waves moving around. The jellyfish and the symmetrical tailfin gave an impression of a sea god in ancient times.
On November 13, 2017, the head of Beijing Photek S&T Development Co., Ltd., Ddickky, noted that people seem to think that Xingchen was easy to manage because she was the company’s only VOCALOID. He mentioned that he wanted to try to "have five to take care of" to see how challenging it was to manage more characters and asked fans to "stay tuned". This seemingly hinted that there may be additional characters aside from Xingchen in the future. Later that month, it was mentioned that because Beijing Photek wanted to save money to produce content, some big news would be announced at Quadimension Live Tour rather than at a separate conference. This included new merchandise, new official art, and if there was time, new games or voicebanks. It was not specified if these voicebanks were for Xingchen or for any new characters. Details about the announcement are currently unknown.
On January 5, 2018, a new female character was hinted and introduced as "Xingchen's younger sister".
On February 2, it was reported that the voicebank was finished and that the character design was nearly completed. However, there was not enough time to create new original songs for the character. This lead to Beijing Photek deciding to make self-covers of Xingchen original songs for an easy comparison between the two. On February 9, Xingchen’s Weibo mentioned that she was the "older sister of Haiyi", confirming the name of the new character.
On February 12, Haiyi’s character design was shown and her illustrator was confirmed to be ATDan. Her first demo, "Ripple", revealed that she had four voicebanks produced: Normal, Dark, Power, and Aroma.
At some point during Haiyi's debut, a user conversed with Ddickky via private messaging and asked questions about her. He revealed that Haiyi would be a private character. It was explained that there wasn't enough profit to cover the printing fee for distribution in addition to the desire of avoiding her being cracked or illegally distributed. Only producers who were members of or collaborated with the Quadimension circle were allowed to use her as they were people Ddickky knew well. It was also mentioned that "the next character(s)" were very different to Xingchen and that it "could be said" that they were "making plans for an element of a big plan".
On March 28, 2019, Ddickky posted on weibo that Chiyu, Shian, Cangqiong, two Xingchen voicebanks, and an unknown male voice were moving over to Synthesizer V. Haiyi was ommited from this list, however, it is likely that she is produced for Synthesizer V.
On July 21, it was noted that Haiyi's voice provider was traveling to meet with Ddickky, but the purpose was not elaborated further. On July 22, it was announced that recordings for Haiyi's Synthesizer V voicebank began. This gives the impression that Haiyi's debut voicebank and usages prior to this date did not use the Synthesizer V engine, like Cangqiong.
On August 15, it was noted that Haiyi's voicebank was coming soon. She was set up for preorder on August 23 and was expected to release on September 13, 2019. It was noted that there were some differences between the old and new boxart. A demo was scheduled to release on August 22. She was released early on September 6 instead.
In January 2020, Ddickky confirmed that he learned about the second generation of the Synthesizer V engine in mid-2019. He wrote that it was in the works and was expected to be ready by the end of 2019, but it was pushed to around February or March 2020. He confirmed that Haiyi was the last to release for the first engine and that the next voicebank would release for the new one. In addition, he had plans to gradually update each of Beijing Photek's first engine voicebanks, and depending on the development costs, users who owned any of the four vocals would be able to receive the update for free or for a low price.
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