* 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 [[InTheHood Mysterious Cloaked Guy]] [[spoiler:(revealed to be Inasa)]]. He [[spoiler:kills 4-year-old Miharu - in a [[NightmareFuel pretty gruesome way]], no less. Later, he reveals that he's not only another immortal like Aizawa and Shijima, he's also actually Fuuma Kotarou...who's been tricking, playing with and manipulating everyone from the start because he won't let anything stop him from possessing his "lovely Shinra-san", though as he said, and 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 a hermaphrodite.]]
** Subverted with Kouichi/Raimei being one of the general fan preferred pairings.
* [[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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