KAITO is a humanoid persona voiced by a singing synthesizer application developed by Yamaha Corporation using their new Vocaloid singing synthesizer technology under the codename of “Taro.” His voice is sampled by Naoto Fuga. He has performed at live concerts onstage as an animated projection.

Many songs have been made with him. He was the fourth ever released Vocaloid and the second in Japanese.

The product's name was invited to be chosen by the public, and “KAITO” was selected from among the applicants, which was Vocaloid producer Shu-tP's offered idea. One of the reasons why his name “KAITO” was selected was because it would be easy for non-Japanese speakers to pronounce, and it looked fitting with the name “MEIKO” when they were put next to one another.