Crypton did not set his character and profile except for his package design. The illustration was done by Kawasaki Takashi. Officially, the character is known just as 'KAITO' he has no family name or surname. Due to its common sighting, it is still incorrectly used by fans as his family name even as of the most recent VOCALOID engine release.

'Shion' was a fan-created term used to refer to him during the 2007-2009 period. KAITO is often mistakenly called 'Kaito Shion' or 'Shion Kaito', particularly by overseas fans.

KAITO's codename was 'TARO' it likely came from 'Yamada Tarou ( 山 ( やま ) 田 ( だ ) 太 ( た ) 郎 ( ろう ))', a placeholder name for male characters and the Japanese equivalent to 'John Smith'. 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. The product's name was invited to be chosen by the public, and 'KAITO' was selected from among the applicants, which was shu-tP's offered idea.

Piapro studio update