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.
Jerkass Woobie: Aria. Despite pretty much not caring at all what happens to Rea, you can't help but feel sorry for her since she cannot get any love and attention from her own husband. It is pretty much stated that the reason she hates Rea is because she is jealous of how she receives all of Dan'ichiro's love.
Moe: Zombies do have their coolness factor and all, but who'd have thought they can also be cute?!
Unintentionally Unsympathetic: Rea's dad seems to be portrayed as a Jerkass Woobie, where it's explained how he was very much in love with Rea's mother. He doesn't want to see Rea to go but given his very disturbing interest in her, it's difficult to get past that.
It doesn't help that he's fired anybody who he deems remotely threatening to his daughter (or his ability to take nude photos of her). Or that his creepy, overprotective nature is what drove Rea to suicide anyway. Or that he attempted to kill a high school student out of pure jealousy. Sad history or not, he is a Jerkass for sure.
Viewer Gender Confusion: If it weren't for the sailor fuku, Mero's friend Ichie would be easily mistaken for a boy.
The Woobie: Rea. Come on, can't you feel sorry for the girl for having such sucky parents? Especially having a strict dad forces her to be perfect, take nude pictures of her on her birthday to ensure her beauty, and isolate her from the normal schoolgirl lifestyle.