These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Cry for the Devil: About a volume after Veronika's introduction, the reason she’s so cruel and jaded is explained: She used to be a nun working as a doctor in a small European village, but because she befriended a group of gypsies and began a relationship with one of their women, she was persecuted along with them as a witch by a mob led by a Christian priest.
They Wasted a Perfectly Good Plot: Just as Shut Hell was getting some Character Development and her revenge story was taking an interesting turn... she gets possessed by her reincarnation, who has not gotten much character development and is less interesting to the audience as a result. However, Sudoh makes it clear that Shut Hell is still inside her body, leaving clear implications that the switch is probably not permanent.