They are prevalent in Nico-Nico Douga but are present as well in YouTube. They usually sing music that were composed to be sung/or covered by any of the official/fanmade Vocaloids. Some of them may attempt to sound like a Vocaloid using their own voices. Human Vocaloids (referred to as such due to their vocaloid-centric nature) are live singers with Vocaloid-inspired avatars. Main article and detailed information: Genderbent Vocaloids Usually Genderbent Vocaloids are actually Vocaloid songs pitch-changed to create a male or female song they are rarely songs made with a different voice configuration. This is very common among Western fandom.

Genderbent Vocaloids are Vocaloids with the gender switched. Main article and detailed information: Hagane Vocaloids Most Hagane songs rely on double bass and blast beat drum techniques along with heavier tuned guitars and bass to give that 'down' effect usually used in metal today to achieve quality 'breakdowns'. They are often heard using the same voice setup as the original vocaloids but seldom use audio distortion to push their vocal ranges to extremes to achieve a growling effect. The Hagane Vocaloids are a group whose image and songs are based around the heavy metal genre of music, particularly death metal and the majority being Nu-metal. Main article and detailed information: VOYAKILOID Several Voyakiloid characters have been made by fans that reflect frustration in getting them to sound and sing right, although this is not always the case. These characters are often portrayed as negative, down and unhappy, unlike the typical mainstream characters. Voyakiloid (read as 'grouching vocaloid') is a group of derived Vocaloid characters that represents failure. Though mostly satisfying a niche audience, they have a devoted fanbase and have many songs to their name.

These total conversions change the style of both the songs they sing and the art they are shown in. Also it should be note that not all the fans accept Fanmade vocaloids.There have been several total conversions of the original vocaloids made to resemble certain stereotypes or pop-culture references and often include several vocaloids under a single banner. Most emerging derivations are coming from non-Japanese sources, like YouTube and DeviantArt. In Japan, these fanmade characters are never called 'Vocaloids' on their own, but 'characters derived from Vocaloids' or 'derived characters'.

There are more than 1000 original Vocaloids combined, yet only a fraction of these are supported by their creators or other producers with actual singing or promotion. Some are only represented visually, and have no known voices, while others using the different octaves and/or voice configurations of an original. Many Vocaloid fans have created various forms of derived characters from the original Vocaloids refered as Fanmade Vocaloids.

List of vocaloid mascots