Grew Beyond Their Programming: Kyubey speculates this to be the case (perhaps "grown beyond her instincts") for Rochelle, as he had never heard of a witch like her before.
Heroic BSOD: Many. Not including the one that started the quest, after Rochelle's wish was twisted into killing her family, the most obvious one is Mami's constant breakdowns when the nature of magic girls is revealed. Rochelle herself has a major one when loop5 ended, after Mami, the one person who had gotten close to her over the last loops was left behind in the looping. In loop 7, Kyoko also has a rather nasty one, and Napalm has several through the Quest.
The Igor: Igor, a hunchbacked man who serves as one of Francine's manservants and medical assistants. He's just faking the lisp for effect, though, much to Francine's irritation.
Intimate Healing: Turns out Witches can absorb grief to become stronger, who would have thought. Turns out Rochelle is a witch. Turns out the Puellas would often like to take advantage of that skill to be less dependent on Grief Seeds. The only thing standing between them and free grief drain is the level of trust they have given that Rochelle has to take their soul gem and stick it into her mouth to suck the grief out. A) She has very sharp teeth. B) She still is a witch, even a benevolent one, god knows what might go wrong. C) It feels like there are mouths, thousands of them, so many kisses, and you are inside a mouth, and it is so warm and close and they are everywhere touching your everyth-
Jerk Ass Genie: The Incubator that originally contracted Rochelle twisted the wish (something even Kyubey never did) in order to cause Rochelle to witch out faster. The voters have joked that this probably makes him the 'black sheep' of the Incubators for having to resort to such blunt methods.
Spanner in the Works: Several, all running headlong into each other. As per normal, Napalm is this to Kyubey. However, Rochelle is this to Napalm and Kyubey, while Napalm also makes a point of ruining Rochelle's plans whenever she gets the chance. And then there's the Jester Witch-thing, who acts more like a Umineko: When They Cry Witch than a Puella Magi Madoka Magica Witch.
Sociopathic Hero: Napalm is far, far worse here, thanks to Rochelle unwittingly screwing up her attempts to keep Madoka and her friends safe. At one point, she, assuming Rochelle's only change from other Witches was gaining self-awareness (meaning still evil and murderous) offers to let Rochelle eat several citiesif she goes elsewhere to do it. Given how hard Rochelle had been trying to save everybody, this was a massive slap in the face.
What the Hell, Hero?: In loop 7, Rochelle and a few friends finally managed to put Napalm in a position where they had to talk things through. Napalm went on to offer to let Rochelle eat several cities as long as Rochelle didn't bother Madoka and herself any more. Neither Rochelle, nor the voters were pleased by this 'offer'.