Kaito is a Voice Synth developed by Yamaha Corporation for the Vocaloid engine, and distributed by Crypton Future Media. He has performed at live concerts onstage as an animated projection along with Crypton's other Voice Synth characters. His original codename was "TARO" back during "Project Daisy", the predecessor of Vocaloid, and was one of the original four known vocals for the project. His voice provider is Japanese singer Naoto Fūga. He was the fifth and final vocal released for the original Vocaloid software, and the second vocal released 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.
In all releases, Kaito is marketed as the counterpart of Meiko.
From Wikipedia (https://en.wikipedia.org/wiki/Kaito_(software)) under Creative Commons Attribution CC-BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0/legalcode)