* BaseBreakingCharacter: Miu, being an attempt at an anime [[WesternAnimation/SouthPark Cartman]]. The show tries painting her as a hilarious BrattyHalfPint, but some fans feel she misses the mark, as she is an obnoxious bully on occasion. Others find her brilliantly funny.
* CrossesTheLineTwice: In "Matsuri in Rehab", Miu is hit on the nose with a rubber band, is kneed in the shin, then gets dizzy and falls flat on her face, all within two pages. The other girls think it's funny.
* EnsembleDarkHorse: Sasazuka, a side RunningGag character who constantly gets sent to stand in the hall by the teacher for no reason. He gained a lot of sympathy from fans for both being a source of SugarWiki/FunnyMoments moments and having TheWoobie qualities.
%% * LesYay: Miu likes to invoke this. The other girls aren't very receptive.
* NoYay: Occasionally Nobue's CutenessProximity manifests in creepy ways, like staring at Ana in the bath or trying to kiss Matsuri. Chika tries to keep her sister from doing anything she might regret, while Miu just cracks jokes about it.
* MemeticMolester: Nobue. Sometimes her affection for Ana and Matsuri seems not entirely innocent.
* MemeticMutation: Ana's facial expression (Google "gununu" for details) has become a popular visual meme.
* {{Moe}} The whole cast, really. The English dub just takes this further casting younger girls near the characters' ages with all the adorable squeals and voice cracks that implies.
* SugarWiki/SuperlativeDubbing: The studio opted for the uncommon practice of hiring actual girls very near the ages of the characters to get a more authentic dynamic among the cast. And it works. Unfortunately it means the chances of the [=OVAs=] getting dubbed are very, very unlikely.
* WhatDoYouMeanItsForKids: While the series is fairly light-hearted and is serialized in a Shōnen magazine, one of the main characters is Nobue Ito, a character who engages in frequent smoking and drinking. This is less of an issue in the anime (where she is depicted as a 20-year old adult), but in the original manga, she is ''only 16 and still in high school'' (which is stated on the ''very first page'' of Chapter 1). Chapter 41 also reveals that she has been smoking since at least ''7th grade'', and was only dissuaded from trying it as an elementary school student after reading the warning label on a cigarette box she picked up.[[note]]Perhaps incidentally, she is seen smoking significantly less after this chapter.[[/note]]
* TheWoobie: Sasazuka who, unlike Miu, gets sent to stand in the hall for no reason. Plenty of fans feel so sorry for him that they outright claim they'd root for him if being subjected to a biased teacher kickstarted his villain origin.
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