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ONE (オネ) (stylized with a backwards "И") is a Japanese CeVIO Creative Studio voicebank by 1st PLACE Co., Ltd.. She is capable of both speaking and singing. In July 2020, another voicebank was confirmed to be in the works for CeVIO's new engine CeVIO AI.
Her voice provider is also called ONE.
ONE is the second installment in the "- ARIA ON THE PLANETES -" project.
ONE has little background, however she and IA were given some background information for the ARIA - IA Musical & Live Show – performances. In a series of YouTube videos dubbed ARIA STATION, IA and ONE introduced their home-world known as Planet ARIA. Planet ARIA is described as a world similar to Earth with various life forms that resonate and co-exist together, several of whom raised IA & ONE. Four inhabitants of the planet were introduced and their relations to IA and ONE were revealed:
- A gray, multicolored cat named “チコー” (also known as “Neko-san” or simply as “cat”) is one of the spirits that exists on ARIA. She acts as a mother and has been with IA & ONE all of their lives and came to Earth with ONE. She is described as being a very sweet cat that watches over IA & ONE. .
- The second member revealed is a large elder tree named “Chōrō” (“長老”, meaning elder) or "Choro no ki”, (長老抜き,meaning the eldest tree.). Chōrō is described to be one of the oldest spirits on Planet ARIA and acts as a “grandfather” figure to IA and ONE. He is very knowledgeable about ARIA and is connected to everything on the planet. He was described to have taught IA and ONE all that they know. 
- The third member revealed was a purple, bipedal cheetah named “チート” (also known as “Cheet”) . Cheet acts as IA and ONE’s dance teacher. She is described as being stern and is able to move very quick. 
- The last member introduced in the series is a large white phoenix named “フェニックス”(also known as “Phoenix” or simply known as “Nix”). He acts as a singing teacher and voice trainer for IA and ONE. It was revealed that he learned how to transform into a human form from Chōrō.
During the IA 9th & ONE 6th Anniversary ‒Super LIVESHOW- on January 27th, 2021, three additional characters were unveiled, one of whom bares the name "H" on their nametag and the other two being an anthropomorphic lion and a reindeer-like creature. Their relationship to ONE (and IA) is unknown, however they were announced to be “ARIA” members.
Her name is pronounced as "Oh-Neh"
ONE has short platinum blonde hair that ends with an orange tint and hair flaps on the top. Like IA's two braids on her side, ONE has a matching braid at the back. She has a "sporty" look with a white tubetop under an orange spaghetti strap dress. The dress is black at the bottom and fastened with a white belt, giving the appearance of a miniskirt. A variety of orange and black tattoos cover her left arm and thigh. She wears mismatched socks, with a black thigh-high on her right and a striped black knee-high on her left. She also has lace-up boots that have an orange trim.
- IA - a VOCALOID3 (and CeVIO) vocal by 1stPLACE and the first installment in the "- ARIA ON THE PLANETES -" project.
She is the first CeVIO released by a 3rd party developer/publisher. She was introduced on January 24, 2015, during the "IA Special Anniversary Livestream" event. On March 27, demos for her singing voicebank were released and it was announced that this voicebank would release on May 22, 2015.
In January 2015, she was introduced on 1st PLACE's CeVIO software page. The official 3D model was slated for free download on February 6 and it was created for the MikuMikuDance (MMD) program. She was made by mqdl, a 3D modeler.
- A youthful Japanese vocal that is capable of speaking and singing.
- ONE (CeVIO Creative Studio), May 22, 2015
- ONE TALK (CeVIO AI), March 12, 2021
- ONE SONG (CeVIO AI) May 2021
Media featuring ONE
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