Hi, Vocaloid fan here. I think I'm pretty well-versed in the world of Vocaloid, and I'd be glad to help work on the Vocaloid article and its subpages. First, my opinions on your concerns:
- As people have said before, the Vocaloid fandom is essentially built around the music created by users of the program. Thus, the lines between canon and fanon are often blurred. If we stripped the page of all fan-created material, it would be bare-bones at best, and not focusing on why people enjoy Vocaloid. In my opinion, the canon and fanon examples should be segregated, but on the same page.
- See above.
- Sadly, fans of those things are quite prominent in the Vocaloid fandom, but pure fan reactions could probably be cut. Songs are more complicated (see below).
- If it's okay, I could clean this up. It doesn't look too hard, considering that the required viewing is right there.
Now, there are a few other problems I would like to bring up:
The opening of the article spends most of its time talking about Crypton Future Media's accomplishments rather than actually talking about Vocaloid and its community. Several Vocaloid fans have expressed their disdain for this in the past.
There is also the issue of sexual songs. What do we do about them? Usually, it seems that sexual material in songs is tolerated a lot more than it would be otherwise, with stuff that would be considered tasteless PWP in another medium being played on mainstream radio. Vocaloid is no exception, and while this opens up some questions on its own (like, what do we do if we have a nine-year-old girl voicebank covering a sexual song?), there is something different about the Vocaloid community's songs:
Since most Vocaloid songs are distributed on the Internet, they are subject to a lot less censorship than usual. Thus, people are free to go in wild directions with their lyrics and still rack up enough views to be considered "mainstream". Are we to allow a song about a little boy being a victim of statutory rape played off as sexy? A song about a borderline-jailbait girl gleefully spewing absurd sexual euphemisms with an illustration of her face covered in nondescript white fluid? A song with a girl repeatedly chanting about her preference of shaved pubic regions? All of these are real examples, and at least one of them is already listed on a Vocaloid subpage.
Okay, that's it for my major concerns. While we're here, I have a really minor one I was wondering about, too: there is a song listed on the Vocaloid Nightmare Fuel page that is forty seconds of very quiet noise, and then twenty seconds of extremely loud noise. So, it's basically a glorified screamer. Is that allowed?