VIPPERloids are a line of UTAUloids created by the denizens of vip@2ch. Initially they were made to fool people into believing that a new Vocaloid was being released, but after the failure (or was it success?) of Ruko, they have moved on to general trolling.
Canon Immigrant: She was originally supposed to be an April Fool's joke. Her first song was sung by a real singer, and had nothing to do with UTAU initially. After the prank was over, a real voicebank was recorded and released.
C-List Fodder: Surprisingly for a Vocaloid-sung video, both of the "April Fool's" UTAU characters show up in the video for Kagome Kagome. Unlike Teto though, who has no solid role past 'extra', Ruko exists in the video solely to get decapitated.
To erase the data, or to destroy the laws of nature? You must pick one; the darkness becomes despair, I will get rid of and make a key of the universal white. And when I do, I will be known as the GOD of destruction and creation
Expy: Not by the fans, but Tei compares herself to Kyubey twice
Four Is Death: She's the fourth official VIP release (she'd be the sixth, if people counted with the unofficial releases, Rook and Miko, but it's another completely different bad number), she's yandere, and her series "number" is a Q, which is a really loose pun on "kill". One has to wonder if it's just a coincidence or if it was fully intentional.
Surrpassing Hatsune: Because since Tei is meant to be an Yandere, any Yandere-based song sounds more reasonable and better. Sometimes Tei is much better on other songs like Hatsunes'. Sometimes, other Vocaloids (Len Kagamine and Hatsune) have Tei joining them
Anthropomorphic Personification: Of a castella cake. And since castella cakes are Yufu's character item, it tends to jokes in the fandom. Of course, it was probably intentional from Teira's creator's part.
Creepy Child: She (and her "genderbents", Tiramisu and Mashuu) might appear to be like that, to some fans.
Kid-Appeal Character: Teira also has a younger sister (produced with the g- flag instead of Mashuu's g+ flag), called Tiramisu.
Wings Do Nothing: Her (and her less-known sister's) earwing is basically just for decoration, as it'd be impractical for said accessory to make one fly.
Ax-Crazy: His most famous song, Despair in the Hamburger Factory, portrays him and Teto in this fashion, even though his original personality isn't like that. It's generally (though, not canonically) accepted that this is how his angry side must be, therefore, making him Cute and Psycho.
Gender Bender: Shemu Chikune. She's a cyborg vampire partially made with Lego pieces.
Keet: He's pretty tall, but fits all the other characteristics.
Our Vampires Are Different: Kenta can walk under strong sunlight and doesn't need to drink blood, as well as he's a ball of cheerfulness, and, to pepper it all up, he's Christian as well. Though, in the situations where he gets angry, he becomes more like a traditional vampire. Apparently, according to his creator on Formspring, he's still vulnerable to garlic, but doesn't notice it.
Trademark Favorite Food: Lemons. He can live without blood, but not without lemons. In his Formspring, it was joked about how he must smell like lemon detergent.
Bandaged Face: Although they only cover his eyes, not his entire face.