It was revealed that he learned how to transform into a human form from Chōrō. He acts as a singing teacher and voice trainer for IA and ONE. 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” ).She is described as being stern and is able to move very quick. Cheet acts as IA and ONE’s dance teacher. The third member revealed was a purple, bipedal cheetah named “チート” (also known as “Cheet”).He was described to have taught IA and ONE all that they know. He is very knowledgeable about ARIA and is connected to everything on the planet. Chourou is described to be one of the oldest spirits on Planet ARIA and acts as a “grandfather” figure to IA and ONE. The second member revealed is a large elder tree named “Chourou” (“長老”, meaning elder) or 'Choro no ki”, (長老抜き,meaning the eldest tree.).She is described as being a very sweet cat that watches over IA & ONE. She acts as a mother and has been with IA & ONE all of their lives and came to Earth with ONE.

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.

Four inhabitants of the planet were introduced and their relations to IA and ONE were revealed: 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. In a series of YouTube videos dubbed ARIA STATION, IA and ONE introduced their home-world known as Planet ARIA.

IA has little background, however she and ONE were given some background information for the ARIA - IA Musical & Live Show – performances. The design philosophy 1st Place worked toward was to make the voice simple and straightforward but easy to adjust and customize, letting creators create their own version of IA. IA Project also sponsored LEXUS TEAM SARD at Super GT300, following in the footsteps of Racing Miku.IA is the first vocal in the '- ARIA ON THE PLANETES -' project. IA is well known as the vocalist for Jin’s popular series, the “Kagerou Project”, and her voice made a cameo in the anime adaptation’s soundtrack. However, if you wish to sell goods more extensively, or host concerts using IA, prior approval is required. Unlike most Vocaloids, you can use IA’s image on CDs, posters and flyers without asking permission. 1st Place aimed to introduce IA to people not yet familiar with Vocaloid, creating a new audience for the program. IA’s marketing took a mysterious approach, giving IA a sense of otherworldliness. IA is sometimes mistakenly referred to as 15, but she has no official age.Western fans initially mistook IA’s name for “Aria”, from her tagline.Lia desired IA to be cute and pretty, and was pleased with the design. IA’s design utilised soft colours, in contrast to the established idea that only vivid colours would sell.

Vocaloid ia images