IA is one of the VOCALOID 3 characters, with the voice by Lia, who is best known as the original singer for the song, Tori no Uta. The voice pack for IA was released on April 25, 2012
The character is designed by Akasaka Aka, a mangaka and illustrator.
Tori no Uta was released as the first demo song, and it garnered tremendous response as the IA's voice is very close to the original.
Her recommended voice range: B2～A4, and tempo: 63～228