Yes, Ai is a vocaloid. A vocaloid 3 to be exact.
Just to inform you, VOCALOID is a software. And mainly if you want to make something simliar to a vocaloid (music wise) people usually use Utau, I'm not sure how it works, but it's a way where you could make your own vocaloid, but instead call it an Utau. If you're tyring to find out how to make a vocaloid costume for your own character. There are quite a few Vocaloid Dress up games on Deviantart.com, if you want to draw it for example, it's probably best to do some research on other vocaloids or Utaus to come up with your own ideas.
Vocaloid fans like Vocaloid. Vocaloid fans are located around the world. Vocaloid fans also have a tendency to like Japanese animation (anime) and comics (manga).
Piko is the name of both the Vocaloid and the voice provider, who is naturally not a Vocaloid.
No Teto is not a Vocaloid. I have heard before that She was made to be a prank. She is mistaken to be a Vocaloid. She sounds like a Vocaloid(y) software.
People are not sure if the second VOCALOID for the 1st generation was LEON or LOLA. They were both released on the same day. For VOCALOID 2nd generation, Hatsune Miku was the second VOCALOID after Sweet ANN. Lastly the VOCALOID 3rd generation, VOCALOID SeeU is the 2nd after MEW.
No, Akiakane is a Nico Nico Singer; not a Vocaloid.
You would probably have to directly ask a model maker, she isn't that well known and isn't a official vocaloid. (she's just a fanmade of the original Miku)
Yes. Criticism is everywhere. You can find it on Youtube Videos, Vocaloid communities, ect.
No, Vocaloid is not an anime. Vocaloid is a singing voice synthesizer software that allows users to create songs and vocals using virtual characters. However, Vocaloid characters have been featured in various anime and manga series.
Akita Neru ain't a Vocaloid from the start.
Vocaloid is a program used to simulate a human voice for use in songs. Hatsune Miku is a popular Japanese Vocaloid.