I'm not completely sure which one you are talking about, but I believe you are talking about Haku Yowane. She has long silver-gray hair in a ponytail with a black and bluish-purple bow, a gray shirt cut above the belly button, long black pants with a purple chsin, and her character item is sake (alcohol). She is depicted as a failed version of Miku. For more info, check here: http://Vocaloid.wikia.com/wiki/Haku_Yowane
It depends on which one you mean: Long blue hair in pigtails - Hatsune Miku Male in blue scarf - KAITO Girl with jewel on headband - Aoki Lapis
Kaito does not have a last name
IA's male version is IO.
No. VOCALOIDs are not couples. VOCALOIDs do not have to deal with anime or couples. It's only a singing program.
In the context of the Vocaloid character, Hatsune Miku, her name, Miku, is derived from the alternate reading of the two kanji character's that, when together, mean "the future" (mirai).
Gray hair
It depends on which one you mean: Long blue hair in pigtails - Hatsune Miku Male in blue scarf - KAITO Girl with jewel on headband - Aoki Lapis
Piko is the name of both the Vocaloid and the voice provider, who is naturally not a Vocaloid.
A different form of gray. Ususally used to describe those with "gray hair".
One would assume so, They are Vocal Android's Therefore the name Vocaloid
The name Nicole suits most thank goodness no matter how they look...unless they are fat and have gray hair and are opera singers.
It means welcome and blessings.
Kaito does not have a last name
VOCALOID MEIKO does not have a last name. VOCALOIDs from the 1st generation do not have last name. Meiko Sakine is just a fanmade version of vocaloid MEIKO. So does Kaito Shion, Zatsune Miku and more.
What you are thinking of here does not sound like an anime I know, but a voice simulator program called "Vocaloid". It sounds like the female with blue hair is Miku, and I can't quite recall the name of the pink one.
From what I remember in my studies in Cosmetology school and haircolor classes, there is no scientific term for gray hair.
Yes. She is a VOCALOID 2 software created by INTERNET CO. LTD. Her voice provider name is Megumi Nakajima. She has an update, native, and english voice bank in VOCALOID 3.