* BestKnownForTheFanservice: In volume 1's side notes, the author comments that, although chapter 3 introduces Rina and Yuuri, the only thing people seem to want to talk about is Kaito's ShowerScene.
* CanonSue: Lucia
* CrowningMusicOfAwesome
* DeaderThanDisco: Seems to have this status in the Western magical girl fandom.
* DieForOurShip: Poor Michal.
* EnsembleDarkhorse: Rina and Sara.
* EvilIsSexy: Gaito, The Dark Lovers, Black Beauty Sisters, Sara, Michel and the Winged Ones.
* GermansLoveDavidHasselhoff: This show has a surprising number of fans in the West, which begs the question why no TV station wants to air the show.
* HarsherInHindsight: One thing ''no one'' wanted to talk about when the series aired. The entire plot -- both the villains' plan and the Lucia/Kaito love story -- starts because of a tsunami in the Indian Ocean, which killed Kaito's parents and destroyed the orange mermaid country. A certain real-life tsunami in the Indian Ocean with a similarly high death toll happened the day the anime ended.
* HilariousInHindsight: The seven mermaid races share their colors with seven of the eight Fairy Tones from ''SuitePrettyCure'', and given the whole idol shtick...
* JerkSue: Kaito
* {{Padding}}: Transformation sequences.
* PeripheryDemographic: Teenage girls, especially in the Western audience.
* {{Narm}}: The Baby/Coral Fairy from Episode 36.
* {{Squick}}: Some see the fanservice as this.
* StrangledByTheRedString: Caren with Subaru, an anime-only character probably introduced only so people would stop slashing her with her sister.
* SuspiciouslySimilarSong: Some songs from the Italian version sound like their Japanese counterparts; also, and importantly, Michel and Michal's songs.
* ThatOneBoss: "Aurora no Kaze ni Notte" in the video game ''Pichi Pichitto Live Start''.
* ViewerGenderConfusion: Lady Bat, although officially male, causes a ''lot'' of confusion between fans.
** Probably justified (and probably invoked) because he's also a [[CreepyCrossdresser crossdresser]].
* WhatDoYouMeanItsForKids: The more suggestive and bloody manga is rated "13+" in North America, where the AnimationAgeGhetto compels manga publishers to put ratings on their books, yet it was originally published in ''Nakayoshi'', a magazine for little girls.
* WhatDoYouMeanItsNotSymbolic: The religious imagery in Lucia's name.
* {{Woolseyism}}: The Italian dub. The voice acting is great, the songs are possibly, even better than the Japanese ones. They completely substituted J-pop music, to much more pop-rock, and rewritten the lyrics to match the new song. [[http://www.youtube.com/watch?v=ABYYYaI9A-4 Check]] [[http://www.youtube.com/watch?v=I_7gjazsNEU&feature=related it]] [[http://www.youtube.com/watch?v=zpUnhODes24&feature=related out]] [[http://www.youtube.com/watch?v=hC9hRl1E9UQ&feature=related yourselves]].
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