You could also do an exorcism.

It looks that way to me. Personally, I ship H/Hr, but not to the extent that I'd boycott the book if they didn't get together.

(Although I did bitch about it for a while back then.)

But I can help slightly with the HP. Apparently before the release of HPDH, there was a petition going around for J.K Rowling to pair Harry with Hermione, and enforcing this by threatening to boycot (sp?) the book if she did not go to their whims.
Even more amusing, after the seventh book was finally published, a second petition went around demanding that Rowling REWRITE the entire Book, with Harry and Hermione getting together. Around the same time, a third petition went around, demanding that the 7th book should be withdrawn and instead of Rowling publishing it, a Fanfic writer who supported the Harry/Hermione pairing, write it instead.
I was rather amused at that...

As Rilwen said, if it's a Stu replacing a canon character you can kill them. The proper course of action would also have been to first locate the canon character before killing the replacement.

I think there's a few stories out there where agents kill the replacement character. I'm about to write one.

Your agents may still have to file a report on why they did not report on the whereabouts of Gerron in the first place.

Don't think you killed a canon.

Also, the 'Harmonians' being the main cause, try here, which has a list of 'wanks' where nutty H/Hr shippers were involved.

but I can for the H/Hr wars. Basically, JKR was interviewed by two fansite owners - Melissa and Emerson, who run The LEaky Cauldron and Mugglenet respectively - and she was asked a question about shippers. JKR said something about 'anvil sized hints' that it was gonna be Ron/Hermione rather than Harry/Hermione. On top of that, Emerson called the H/Hr shippers 'delusional' and the H/Hr fans went batshit.

I mean, the sane ones didn't. Most H/Hr shippers, I'm sure, got a bit annoyed, but didn't start writing letters to JKR and boycotting the series. But the batshit ones did, and that's why everyone thinks ALL H/Hr shippers are batshit. The main focus of the war was between H/Hr 'Harmonian' shippers and R/Hr shippers. And, yeah. So Harmonian shippers got a bad press while the R/Hr shippers came out scot free. Fandom_Wank will have reams on it, but I'm not sure of the links, and since their main purpoe is to make fun of everything, I don;t know how much you'lll find.

Wow, long post is long. Hope I could help!