*Meiling most definitely. And it doesn't help that the fanon considers her weak, incompetent or the victim of Sakuya's knives when the canon hints to none of these. I hate how every "fact" about this character is simply just made up by the fandom while the canon is ignored (according to which, she's much competent than fans give her credit for).
*Sakuya as well. I loathe the pad joke because the only reason it came to be was because of alphes' art style. That's it. Just because alphes draws a more prominent chest than ZUN, everyone thinks Sakuya wears pads. Again...BECAUSE OF A DIFFERENT ARTIST. That. Makes. No. Sense. Also, the fandom seems to think that Sakuya is a bloodthirsty murderer. Case in point, Meiling. In canon, Sakuya is rather friendly, if not air-headed, and just seems to give Meiling friendly advice on the importance of not slacking off. But Meiling isn't even her only punching bag in fanon. Sometimes, it's Aya. On rare moments, it could even be Patchouli, Cirno or Marisa.
*Cirno as well. True, she's not a "genius" in canon, but to the fandom, she's retarded. I mean seriously. In various games, she is seen exhibiting some hints of having a brain! In Hisoutensoku, she made a strategic retreat after she knocked down Okuu, as 1. the environment was too hot for her, and 2. she couldn't fell the hell raven at all.