Usage for Music of Kaito

Until Gackpoid was released, Kaito and Leon were the only male voice banks and although Len was released his voice did not hit the same notes that they did. Since overall there are far less male vocaloids and he is the only Crypton male vocaloid that can reach his notes.
Kaito's vocal engine has been updated several times.He can utilize two kind of Vocaloid editors,VOCALOID 1.0 and VOCALOID 1.1, and they have different functions and features. There are many differences between ver1.0 and 1.1, and they sound differently even if they are edited in the same way. (Comparison of ver 1.0 and ver 1.1 without further editing Nico broadcast, Nicozon broadcast). The main differences are Singing Style and Portamento Timing.

To use his 1.0 version, users who are NOT using 1.1.2 version need to patch Vocaloid Ver1.1.2 update file for Kaito distributed on Crypton’s official page first before they use VOCALOID 1.0 editor. Without patching, an critical error will occur. 

He is fit to sing anything from hymns and children's songs to R & B and pop, though the style that he is best used for is singing pop ballads.

Kaito

KAITO is a Vocaloid created by Crypton Future Media. He utilizes the older Vocaloid engine developed by YAMAHA, the predecessor of Vocaloid2. The voice was supplied by a Japanese male singer Naoto Fūga (風雅 なおと, Fūga Naoto). The illustration was done by Takashi Kawasaki.. The product's name was invited from the public, and "KAITO" was selected from among applicants, which was the idea of Shu-tP.
He was created as a counterpart of Meiko and developed together. One of the reasons why his name "KAITO" was selected was that it would be easy for non-Japanese speakers to pronounce, and another reasons was that it looked fit to the name "MEIKO" when they were put next to next. On 24th July, 2003, an CCCD album "HISTORY OF LOGIC SYSTEM", which included a song using Japanese vocaloids commecially for the first time, was released. It was a duet song of "Ano Subarashii Ai wo Mou Ichido (That Wonderful Love Once More)" and it was covered by prototype version of Meiko and Kaito before their release. Meiko was released 1 year after this and Kaito followed her 2 years later.