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.
Crack Pairing (Pretty Cure Anime Theatre has done Emiru/Asa fic. Later, on a Halloween dare, the author herself wrote more Emiru/Asa, making it almost an OOC running gag. Her reaction to the original Emiru/Asa fic is here◊.)
Sunday's initial reaction to becoming a magical girl. She was expecting spandex, not frills!
Mia's baking. Actually, the whole bonus episode, but mostly Mia's baking. How can one person be that bad?
Ensemble Darkhorse (Prior to episode 12, Emiru had few fans and most of the readers just wanted to kill her, but joining the ranks of Dark Magical Girl fan-favourites like Ashley, Kane and Sora (and however fleeting her actual evil stint was, Emiru is still Millusion) made her more popular than her level of pagetime would suggest, with crossover writers making her more important than Hoshi, Yukari and Mia, or even as important as Asa and Yoko themselves.)
(According to character polls and comment pages, Binbeat is the most popular villain in the fic)
Evil Is Sexy (Hitosalesque is a burlesque dancer. Before The Movie was scrapped, it was slated to be about her. The main series villains, though, aren't played up as attractive, and in two cases it would just be weird. A few readers do find Kainatrol sexy, too...)
I Knew It ("Dawn" standing for "Cure Dawn" was guessed by a reader in a Free-For-All Friday post. Ami-sensei being Cure Dusk was guessed in a number of places.)
Plot points that the author thought of when conceptualizing the series during 5GoGo's run have come to happen during Fresh, Heartcatch, and Suite, sometimes before Blue Moon gets around to the reveal — such as the Mysterious Watcher being a former Cure, the Cures ending up with a ton of civilian Secret Keepers, and previously-thought-powerless former Cures transforming again. She can often be found grumbling "not again, Toei" in the fan communities.
Moral Event Horizon (Kainatrol reacts to betrayal very badly. How badly? The "kill your sister, lord it over her business partner and possible boyfriend while rubbing it in that he couldn't do anything to save her, pull a "join me or die", and proceed to make his now-eternal life miserable" kind of badly.
And then she kills Eiender. Oh, excuse me. Manipulates him into wanting to erase himself from existence.
Values Dissonance: Caused a change in the story when the author did the research on what a certain action would signify for the characters in their setting. In the original draft of the epilogue, Yoko would have moved in with the Kawadas after coming out to her parents. However, it came to the author's attention that, in Japan, because gay marriage is still not legally recognized, when two women are in a relationship and want to get married, oftentimes the parents of one partner will adopt the other instead. Since Asa and Yoko are in middle school during the main story and certainly not old enough to get married, this was changed to Yoko moving in with Ami-sensei.