* SugarWiki/AwesomeMusic: "Crawl" and "Aru ga Mama" (the anime's opening and second ending song, respectively). "[[http://www.youtube.com/watch?v=1A28tZtVU-c Yureru Kokoro]]" from the OST also qualifies; it's simultaneously strong and mournful and enhances the emotional impact of several scenes.
* CompleteMonster: The Mysterious Cloaked Guy [[spoiler: (Inasa)]] kills [[WouldHurtAChild four-year-old Miharu]]. Later, he reveals that he's not only another immortal like Aizawa and Shijima, he's actually [[BigBad Fuuma Kotarou]], and has [[ManipulativeBastard been tricking, playing with, and manipulating everyone from the start]] because he won't let anything stop him from possessing his "lovely Shinra-chan," though as he said, and as Aizawa admits, he has been telling everyone all along that he wanted the Shinrabanshou.
* EnsembleDarkhorse: Judging by YouTube comments, Gau is quite popular in the English-speaking fandom.
* {{Fanon}}: The fans seem to like making Raimei a YaoiFangirl, or at least a ShipperOnDeck for Miharu and Yoite.
* FanPreferredCouple: Miharu/Yoite, Raikou/Gau, and Kouichi/Raimei.
* FashionVictimVillain: Raikou for sure, except for the outright "villain" part. His work clothes include something like a denim vest, a hakama over jeans, and sandals. His casual clothes are canonically recognized as really, really, ''really'' terrible. He has seriously considered buying a coat of gold sequins. And one with giant stars across it. And has worn a shirt with huge feathers hanging off the back.
* FoeYay: Miharu and Yoite start out like this, but are ''really, really'' bad at acting like foes, and it quickly blossoms into full-fledged HoYay, [[spoiler:especially after Miharu's HazyFeelTurn]]. There's some minor FoeYay between Kumohira and Yukimi too. Not to mention the rather creepy scene where [[spoiler:Hattori]] is practically hitting on Yoite - [[spoiler:''"You really are diligent and smart... as well as beautiful."'']]
* HetIsEw: Some fans were freaked at the possibility that Yoite could be a girl. [[spoiler: He's actually intersex.]]
** Subverted with Kouichi/Raimei being one of the general fan preferred pairings.
* InformedWrongness: Much is made of how immoral Oda Yae's [[{{Telepathy}} Mind Reading]] technique is. While she does use it in [[MindRape unsavory ways]], Tobari's declaration that using it makes her worse than [[CompleteMonster Nowake]] (who, depending on the medium, either killed [[spoiler: Yae's daughter]] or allowed said character to die), is a little hard to swallow, especially since the person she was using it on at the time was an enemy.
* [[JustHereForGodzilla Just Here For The]] HoYay: See LGBT fanbase, below.
* LGBTFanbase: Somewhat unsurprisingly, the series has a sizable LGBT fanbase.
* MemeticMolester: Hattori may have risen to this, thanks to all the [[NoSenseOfPersonalSpace neck-touching]]. And his 'praise' of Yoite.
* MemeticMutation: [[FreudianSlip Gay - I mean, Gau!]]
* MoralEventHorizon: [[spoiler: Fuuma killing four-year-old Miharu]].
** Raikou nearly crosses it when he [[spoiler:tries to kill Raimei, only to be stopped by Gau]].
* {{Narm}}: In the last episode of the anime, a smiling image of [[spoiler: the [[DeathByAdaptation dead]] Raikou]] appears in the sky as Raimei and Gau are talking about him. Given [[DeadHorseTrope how old and frequently parodied]] that device is, it's hard to take it seriously.
* NightmareFuel: Among other things, [[spoiler: 4-year-old Miharu getting his face blown off]] and [[spoiler: Asahi's body ''falling to pieces'']].
** The times where Kouichi shows his darker side are pretty freaky, [[http://www.fileden.com/files/2007/3/3/846856/kouichi1.jpg with this moment as a good example example]]. [[UncannyValley Mother of God]]...
* TheScrappy: Tobari is easily the least popular of the main characters.
* TheWoobie: Oh ''[[StoicWoobie Yoite]]''.
** Miharu and Raimei also ''[[BreakTheCutie definitely]]'' qualify.
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