* AlternateCharacterInterpretation:
** Is Chiho's love for Maou unrequited, or does he want to avoid the implications of a MayflyDecemberRomance?
** Is Emi a fanatic who takes her frustrations out on Maou because her violent KnightTemplar tendencies don't fly in our world, or is her expectations of Maou perfectly justified after everything he did to her people, putting her in an impossible situation now that he's become harmless and sympathetic and her sense of justice won't allow her to just end the threat anymore?
* BaseBreaker:
** Emi's JerkAss attitude towards Maou irks many viewers. Others find it hilarious and justified, given that he was pretty much fantasy Hitler in their world and is threatening to return and try to subjugate them all over again.
*** Episode 7 worsens her status. Is Emi punching and kneeing Maou hilarious or did it show how much of a bitch she is to Maou? Take note that Maou saved her from falling to the ground.
*** She's generally hated on /a/
** Is Chiho hilarious and heartwarming? Or is she annoying and controlling? Some fans think it's the first, while others think it's the latter.
* BrokenBase:
** Some "fans" seem to vehemently insist that the inclusion of an Harem nature into the anime is dragging it down, despite there not actually being a Harem and only one girl openly in love with Maou. Anything to do with Emi and the other girl concerning Maou are only misunderstandings, results of flawed cultural osmosis or not what they seem to be.
** The whole series is this to those fans under the misconception that it's supposed to be HighFantasy and that the SliceOfLife elements are hampering it down.
*** Conversely, when the light novels' narrative gradually shifted its focus to the HighFantasy elements of the story(while still keeping its signature humor), there are also fans who complain that the "innovative" SliceOfLife humor had been ditched in favor of the "generic" LN fantasy fare.
* CargoShip: Maou x Dullahan.
* CounterpartComparison: The fandom has unanimously decreed that Mitsuki, the manager of the rival SFC joint, is actually James from ''Anime/{{Pokemon}}''.
* EarWorm: The [[http://www.youtube.com/watch?v=-TglGpI4NQ4 opening song]] and [[http://www.youtube.com/watch?v=uPksoSEl_CY ending song]] have their charms.
* EnsembleDarkhorse: Despite the intense divisions in the fanbase, most agree that Alciel is the best HouseHusband.
* HoYay:
** The Demon Lord and his most loyal general live together in a cramped, run-down apartment in which the former does the working and the latter does the housework. Oh my. Alciel actually calls himself a "house husband" in his bio, although he acts more like an overprotective parent to Maou at times. Lampshaded by Chiho's classmate who goes wild with yaoi fantasies upon learning Alciel and Maou are roomies.
** Arguably worse now that Lucifer is living with them. - "...boneheads..."
* MemeticMutation: Any Chiho vs. Emi [[ShipToShipCombat shipping war]] will invariably prompt numerous posters to point out that Maou already has the best girl -- [[HouseHusband Alciel]]
* {{Moe}}: Chiho.
* NightmareFuel: The Haunted House in episode 10 is genuinely terrifying.
* PeripheryDemographic: A look at Pixiv's tags for [[http://www.pixiv.net/search.php?s_mode=s_tag_full&word=%E7%9C%9F%E8%8A%A6 Maou]] and [[http://www.pixiv.net/search.php?s_mode=s_tag_full&word=%E8%8A%A6%E5%B1%8B%E5%9B%9B%E9%83%8E Alciel]] quickly shows that the series' HoYay between the two has not gone unnoticed by the YaoiFangirl crowd.
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