Well... There's some pretty bad Kirby stuff I've seen, and I don't remember the name of it but there was a really disturbing Pokemon fic I found a while back...
Oh, and you can't forget all of the Larry Stylinson I've read, I've never read this "cupcakes" fanfiction and I've never read my immortal but I've seen stuff get pretty bad...
My god though, the Larry fics...