If I'm right, someone before me has done an article similar to this. If I say too many similar things to their article, please tell me.

In my opinion, it's impossible to exist in the anime fandom without hearing the words, "Vocaloid", "Hatsune Miku", or "Kagamine Rin and Len" pass by.
With these words come confused fans that are usually new to the anime community. They start to ask the ever-so-popular question, "IS VOCALOID AN ANIME?" From here comes four answers.
1.) Uhh...yeah, it's definitely an anime. Definitely.
2.) No, Vocaloid is a program that...blah....blah...
3.) No, but I think it should be an anime!
4.) No, and I think it should stay that way.
I will be explaining my answer, which would be 4. At first I picked 3, but then really strong arguments suggested otherwise, and now I've changed my opinion. Here are 4 reasons why.

1.) Personalities of the Vocaloids
No matter how you look at it, there is no distinct personality for most Vocaloids. There's kind of a setup for each character when they're in comics and such, like Kaito being perverted, or Luka being calm and quiet. But the songs, the comics, the characters THEMSELVES are left in the hands of the fans. This is because they're a singing software. You can make them say or sing whatever you want. You can change their voice tone however you please. This has gone so far that the only thing you have as a guide for the Vocaloid's personality is their appearance, and their voice, which people each interpert differently. Want proof? Watch Mozaik Role, sung by Gumi. Nice, huh? She seems like a deep character that struggles with self conflict. Now watch Sweet Float Flats. (also sung by Gumi) Wow! Now she seems like a perky girl who likes to observe the people in her apartment. Also, if the makers decide on personalities, i just KNOW that there will be fans like, "Where's my uke Len?" or "Where's my seme Len?" The songs have gathered so much of a variety that fans spread to different places to find their favorite Rin, Miku, etc.

2.) Plot
If the day comes that Vocaloid becomes an anime, what the heck will the plot be? Will they take popular songs and make episodes devoted to them? Or will it end up being an anime about the Vocaloids' daily life and their love of music? (Which, by the way, we all know where that would lead. *cough* K-ON! *cough*) Since Vocaloid was originally made to be a singing program, there's nowhere it can go for plot.

3.) Vocaloids
Here's a game. Try to name all of the Vocaloids you know. Kind of hard, right? If people get the right programs, they can make a Vocaloid, and if the person is famous, the Vocaloid gains fame as well. With this comes a wide variety of voices, outfits, and languages. So wide that the Vocaloid cast would be as big as Naruto's cast! With that comes little screen time for some characters that might deserve it, like IA. (Also, on the matter of languages, how would foreign Vocaloids sound speaking Japanese? o.o)

4.) Songs
Here's another game! Name all of the Vocaloid songs you know! This is probably the hardest game ever because once someone get the voicebank of a Vocaloid, they can throw together a song, toss in some instruments, make a video, post it on NND, and then sit back and admire their skills. Let anyone and everyone do that, and what do you get? An infinite number of songs. If the anime is going to focus on the songs - even if it's just the popular ones - the episode amount will be pretty high. Naruto? One Piece? Those would be pretty short in comparison.


Also, there's been a nice amount of Vocaloid sprinkled into the anime fandom. From "Was that Miku?" to "I saw a Miku figure in the background!". It has also been taken further, for example, Watamote's 6th episode's ending is sung by...you guessed it! Miku! And then at the furthest extent of combining Vocaloid and anime so far...the Kagerou Project! It is a series of 20-some Miku and IA songs that has a novel, manga, and a recent ANIME adaptation. Since the plot is constant through the songs, the anime is flowing pretty smoothly while still including covers of song like Kisaragi Attention and Mekakushi Code. But Vocaloid itself becoming an anime would be way too scattered and random.

To sum it up, Vocaloid should stay as it is - a series of songs.