* BaseBreaker: [[spoiler:Yuji Sakai after merging with the Snake of the Festival]], and ''oooh boy'' is it almost as bad as [[Manga/{{Naruto}} Sasuke Uchiha]]. While he has clearly has [[WellIntentionedExtremist well]]-[[UtopiaJustifiesTheMeans intentioned]] goals, others consider him to be a borderline {{Sociopath}} who doesn't care about anything else outside of his goals.
* BrokenBase:
** The third and final season has split the fandom between supporting Flame Hazes and Crimson Denizens -- and in this case, RootingForTheEmpire is quite understandable.
** Geneon Dub VS Funimation Dub. That is all.
** Yuji's DarkerAndEdgier AntiHero tendencies over the course of season 3 has left many fans grumbling about the drastic change in personality.
%%* CreatorsPet: Kazumi Yoshida.
* DieForOurShip: Kazumi, especially after [[spoiler:Pheles gave her a Treasure Tool which can summon Pheles, but would take Kazumi's life as a price]].
* DudeNotFunny: The ending of the ''Shakugan no Shana'' movie. [[spoiler:Yuji, believing he's going to fade, finishes what he thinks is his "last speech" to Shana just as the Reiji Maigo replenishes him. Shana and Alastor double over laughing.]]
* EvilIsCool: [[spoiler:Yuji as Snake of the Festival]] definitely fits the bill; his fans often nickname him as Darth Vader [[spoiler:Yuji]], or just Darth [[spoiler:Yuji]] for short.
* EvilIsSexy: [[spoiler:Yuji as Snake of the Festival]] has attracted a lot of fans over to his side because he took a massive level in {{Bishonen}}. Honourable mention goes to Bel Peol, with her choice of clothing.
* FandomBerserkButton: [[http://www.youtube.com/all_comments?v=7_mJBJWJJUk It seems the correct form of Shana's catchphrase is "Urusai! Urusai! Urusai!!!"]]
* IdiotPlot: Some feel this way about Season 3, in which the Denizens are simply trying to get out the Flame Hazes' hair and avoid having to RetGone any more humans. The only reason there is conflict is because the Flame Haze army doesn't trust them.
* GodModeSue: [[spoiler:Yuji after he ascended as Snake of the Festival]]; he basically and literally becomes God, and needless to say the strongest character in the series.
* MemeticMutation:
** URUSAI! URUSAI! URUSAI!
*** URUCHAI! URUCHAI! URUCHAI!
** OH GOD SHANA IS HOT
** [[VerbalTic de arimasu~]]
* MoralEventHorizon: To several people, Yuji driving Margery Daw towards the DespairEventHorizon, as well as the infamous scene between him and Shana during her captivity in the Palace of Stars.
* NeverLiveItDown: Yuji is probably going to be forever remembered since season 3 as 'that would-be rapist world destroyer' no matter what positive qualities does he have.
* NightmareFuel: Being devoured by a Crimson Denizen results in you being replaced by a Torch. Bad enough that your remaining life is spent as a sort of cosmic scab meant to insulate the universe from your disappearance. What makes this NightmareFuel is that when the Torch burns out, not only do you die, but no one will ever remember that you existed at all. There's an episode that chronicles Yuuji trying to save a Torch; watching her run down and burn out is equal parts TearJerker and this trope. If memory serves, the episode even ends with "What have we been doing all day?" when she does vanish. Brrrr.
* ParanoiaFuel: At any time in the past, you may have been killed, eaten, and replaced with a copy ''without you even realizing it''. And eventually, that copy can run out of power...
* RootingForTheEmpire: One interpretation is that the more Crimson Denizens (Guze no Tomogara) are in desperate need of resources and thus feeding on humans is sometimes the only option and some Flame Haze are [[KnightTemplar overzealous]]. The former is backed up by the idea the Bal Masque was founded by a god, thus they essentially should have the same authority as Flame Haze (though they are not contracted with Crimson Lords). The latter is partially backed up by the fact that Margery Daw was originally shown as being somewhat of a BloodKnight and cared nothing but {{Revenge}}, thus indicating that there are more violent and less honorable Flame Hazes.
** RootingForTheEmpire became a more viable option in the later light novels (and the third season) when it is revealed Bal Masqué's plan, as well as [[spoiler: their new leader Yuji's]], is to create a utopia called Xanadu where Crimson Denizens will not need to devour humans to sustain their existence, and even coexist peacefully with them. [[spoiler: And considering how the series [[TheExtremistWasRight ends]]...]]
* TheScrappy: Kazumi Yoshida. Aside of the DieForOurShip and RealWomenNeverWearDresses factors, there's the fact that people think she's shallow, boring, clichéd schoolgirl-in-love-for-a-classmate, steals too much screentime for her little romantic-anime antics, has a formidable amount of CommonMarySueTraits and, for the final blow, her impact to the overall plot is almost null. A quick Google search turns up comments on her such as "The single greatest flaw with this series is that she isn't dead yet."
** That said, at least some people saw her as RescuedFromTheScrappyHeap after the final season.
* {{Squick}}: The Aizens, Tiriel and Sorath, [[BrotherSisterIncest make out with each other]]. In public. A lot.
* TheyWastedAPerfectlyGoodPlot: Yuji coming to terms with his upcoming CessationOfExistence with the knowledge that at least he won't be ''completely'' forgotten when he disappears could've made for an interesting story (even if the story had to go searching for a new male lead after that.) Instead, Yuji turned out to be a [[MacGuffinGirl MacGuffin Guy]] that regularly restores his own Power of Existence.
* VisualEffectsOfAwesome: One of J.C. Staff's best animated adaptations in recent years, and the third season [[SerialEscalation simply escalate from there]], culminating in the glorious AnimationBump that comes with [[spoiler:the creation of Xanadu]].
* {{Wangst}}: Often resulting in combat. At times it seems like the series would be half as long if Shana and Kazumi wouldn't take so much time with their angsty internal monologues over Yuji, although Yuji himself is no stranger; he plays this trope at the end of the second season!
* WhatTheHellCastingAgency: A lot of fans (especially those who were familiar with [[Creator/BradSwaile season 1]]'s dub) didn't like Creator/GregAyres's performance as Keisaku Sato in [[TheOtherDarrin Funimation's cast]].
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