One Piece:
Fandom: Usopp nose doujinshi, although it also amuses me in a sort of dark way. But still. It doesn't really look like 'that'. If your 'that' looks like his nose, see a doctor, something is wrong.
For not-my-characters, I like ZoSan perfectly fine, I like almost any pairing fine, but OP fandom has waaaaay too much of it considering how many other possibilities there are.
Canon: Mostly fillers, which manage to insult Usopp in incredible ways, although the rest of the crew also forget what they can do most of the time. "What, an ordinary human being?! With guns?! I've never faced something as scary as that!"

Slayers
Fanon: Xelloss getting all weepy touchy feely.
Canon: Eh... sometimes the art style annoys me. Xelloss's hair changes weirdly. >.>;

Vorkosigan Saga
Fanon: Very small fandom. I would have to investigate it more to get mad at it.
Canon: Not enough Mark! Mark is more interesting to me than Miles at this point. More Mark! Yeah, that's just self-serving.

..... Not sure if I can say this yet, but... Danny Phantom canon, season three, nothing more needs be said for anyone who knows the series. Okay, and fandom making Vlad into either a rapist or a super-nice guy, and forgetting that he has a sense of humor.