Maybe it's because I was on the receiving end, but I thought Harry made himself quite clear, that if the most minor character in the least-important book in a long series is the hero of a short article of fanfic, then it is plagiarism, and the only way to post a link here would be to post the link to the original author's site, and mention that there is a link to the fanfic to be found there (assuming that was the case). He didn't say it like that, but it was clear enough to me. But like I said, maybe it was because I was on the receiving end. But if there is any kind of "wiggle room" in the no plagiarism rule, I would certainly like to know because I'm now quite leery of posting links. At the time, I didn't cite the wiki article, but there were several other well-supported citations provided by me and others for the fact that Rowling has withdrawn any objections to Lippert's work and that Lippert gives full props to Rowling on his site and in the forwards of each book. When I was in college, the types of citations provided would have been enough for the most hard-nosed professor I ever had, but since he isn't a mod here, that doesn't apply, I guess.
Even so, I hope Lippert does come out with usable epubs soon. I got my pdf from Lippert's site, but I haven't tried converting it because I lack the time/motivation to work with it.