What are VIPPERloids?

-They're a line of UTAU voicebanks created from the denizens of vip@ch. Despite having a very high quality voice they're originally made as jokes and a pranking attempt to them off as a "new Vocaloid". Ever since then every April Fools there came a new Vipperloid, usually mocking the demographic of specific people and the political situations of the world at the time of their creation and release. Most Vipperloids were made by strangers in vip@ch and is the reason why they vary in quality.

The beginning of a trend

-Vipperloids began in April 1, 2008 with Kasane Teto when someone in Nico Nico Douga posted a "new Vocaloid reveal" video. It was revealed to be just a low quality voicebank made in UTAU. However interest over the character, her design and voice soon came and a demand that she be released to the public (and eventually did). Since then, the process was practiced every year at April Fools, bringing along a new voicebank as Vocaloid trolls. Teto herself has become a popular icon of the UTAU community as well.

Not all Vipperloids were released. Some don't even have a voicebank, but are still regarded as Vipperloids.

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Vipperloids currently around:

Kasane Teto

Voice source: Oyamano Mayo

Official Site

Scott

Voice source: Pain-kan

Official Site

Namine Ritsu

Voice source: Canon

Official Site

Yokune Ruko

Voice source: Yuu Hikachi (female voicebank), Yuu Raichi (male voicebank)

Official Site

Sukone Tei

Voice source: Futaba Kako

Official Site

Ooka Miko

Voice source: Akazukin

Official Site

Hinomoto Oniko

Voice source: Senbou Hibiki

Official Site

Go-on Nero

Voice source: Ugapon

Official Site

Kotone Tsuru

Voice source: Toshima Sugi

Official Site

Hate Aino

Voice source: Koshisaka You

Official Site

Munashine Bochi

an unreleased Vipperloid.

ISIS-chan

Voice source: Chiko

Official Site

Erusalem Kuruwane

Official Site

Rook

Voice source: Yuji

Official Site

Kasane Ted

Voice source: Kasane Teto (he's literally a genderbend, to get his voice, just type in the flags g+35 in UTAU)

Official Site

Kin Akune

Voice source: 真崎ぬいさん

Official Site

Chitose Rifu

Voice source: Black

Not her official site, but it contains some more details about her

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Its still not known if more Vipperloids will be released this current year, but its not a bad idea to wait and see if it happens.

Sources:

UTAU Wiki 2.0

UTAU Wiki