What are all the numbers listed on the Vocaloid characters?
That’s the character’s model number. So far, the only official Vocaloids to have these numbers are those in Crypton’s Character Vocals series. These Vocaloids are Miku, Rin, Len, and Luka. The numbers represent the order in which their voicebanks were released. Miku was released first, so she’s number one, Rin and Len were released as a pair, so they’re both number two, and Luka was released third, so she’s number three. Miku’s two major derivative characters who have numbers like this are Haku Yowane and Neru Akita. Haku has DTM stamped on her arm. It means Desk Top Music, and references her purpose. Neru Akita has DEN2 stamped on her arm, but its significance is unknown. Another group where these numbers are common is in the Vipperloids, who are UTAU characters meant to trick users into thinking they’re the next Vocaloid. Teto Kasane has 0401 stamped on her arm, and it stands for her release date, April first. Ruko Yokune has the number 65 on her arm, because it sounds like her name
