I'm not very "active" on Gurochan (or any other related web places) these days so I won't be a regular contributor. However, I'd be open to writing / co-writing a page or two about specific fetishes.

I imagine this kind of format would suit most pages about specific kinks pretty well:

1. Introduction. What this is and how it's usually called (if there are many ways to refer to it).
2. Why do people who find it appealing find it appealing? (obviously subjective; a compilation of some first-hand accounts mixed with some introspection/analysis, meant to "explain" the kink to someone who isn't into it)
3. Notable online communities dedicated to this, if they exist. Websites, forums, even specific threads at Gurochan and stuff like that.
4. Gallery with examples, with proper attribution to artists (unless it's indeed really hard to find the artist - make a genuine attempt at least)
5. If applicable, a list of appearances of this in more-or-less mainstream media (movies, videogames...).
6. Related kinks, and ideally *why* they are related (i.e. "If you like the embarrassment aspect of this kink, then consider checking out that one as well").

I agree that vandalism might be an issue, and also the whole project of this Wiki might not be as popular as you think. So maybe people should be free to edit/save drafts, and then when they are ready to publish what they wrote, this commit will have to be manually approved by the Gurochan admins? And if, after some time, there will be some active contributors who can be trusted, then they can be granted access (password-protected, per username) to contribute without this pre-moderation.

As a side note, I've also considered setting up a couple "Kink 101" pages over at F-List, for some niche kinks. Same idea - an introduction to a kink for anyone who is new to this, clearing up some misconceptions (if they exist), etc. The ones I have in mind aren't really guro-related, but it's kind of a similar project. I haven't gotten around to do that yet, though.