Complete Monster: Dark Lord Sabine aka Margaret Fernandes. She raped a man, which got her pregnant, sold said child Jellal into slavery at the Tower of Heaven cares about nothing except becoming queen, which she believes to be her birthright and has been called a sexual predator by at least one reviewer. As if to hammer the point home, Zancrow, considers being adopted by her to be an honor.
As of chapter 100 it's then revealed that She considers what she did to Jellal trivial, which only further cements this trope.
And then in chapter 101 we get insight to her backstory, completely defying any chance Margaret had at having a Freudian Excuse, thus making her this trope to pretty much almost everyone.
Ensemble Dark Horse: Sindel and Airy are well-received by the fan base at large, even voting them into the Fairy Tail Team B for the Grand Magic Games more often than some of the canon cast members.
Emma Jaeger is also a very popular villain and some fans can't wait to see her come back.
Fan Dumb: Several fans solely blame Marianne's death on Suzaku when Suzaku had fingered Lelouch as being Zero and Marianne simply stepped in after the fact. The council were also the ones who decided to put her on death row and Suzaku had no control over that decision. It's even implied he tried his best to stop it.
They also are raging against the author for making Lelouch "A weak piece of shit" even though everything that Lelouch has done suggests otherwise. They only see him not winning fights even though he left on a journey for four years and funken wagnel all else.
Foe Yay: Rakshata and Lloyd are still trying to one up each other. Laxus and Gajeel even comment to the effect that they should do the sideways polka.
Villain Sue: Sindel in her first appearance might be seen as this to some. She has an incredibly sympathetic backstory and has enough power to tank two Fairy Laws, Iced Shell, crash magic and the vast majority of the Fairy Tail cast. Well, at least until she gets sealed inside her 13-year-old body, but even then it's a case of Brought Down to Badass where she is strong enough to fight in the S-class exams. And then in chapter 100 she gets some of her power back as well as Fairy Glitter, though, to be fair, after she's sealed, she's slowly starting to turn into the Big Good it looks like.
What an Idiot: Sometimes the more...innocent characters of the series can drive you to facepalm
Euphie, sweetie, being in a relationship with someone isn’t going to stop the Male Gaze
NINA! YOU FUCKING IDIOT! Euphie had the situation with Kallen under control!
Estellise has so many that we’d be here all day listing them.
The Woobie: Outside of Knightmare Frame you have Undine Celeste, the guild master of Mermaid Heel who was taken in by Erubay, the water dragon. Erubay, an otherwise humanhating dragon, took her in and raised her, but when Undine ran off after discovering another human, eventually being asked for her hand in marriage, Erubay killed her fiance and Undine became so enraged that she wound up killing her own mother. If that wasn't bad enough, since she doesn't have the dragon anti-bodies that were given to the other dragon slayers in canon, she is slowly turning into a dragon and her arms are the first victim on her body. She has also regretted that day of her life for the last 23 years and counting. At least one reviewer of the story has admitted to wanting to give Undine a hug.
World Of Woobie: It seems to be a requirement of Knightmare Frame that you have some sort of sad history to be allowed into the guild.