* AlternativeCharacterInterpretation:
** Seriously, one can write an entire thesis over [[spoiler:Seishirou]]'s character, especially after his actions in Manga/{{X1999}}. [[spoiler:His reason for letting Subaru live after the boy witnessed his murder, and made the bet over if he could learn to love him; wherever he's really evil or just a result of his Sakurazukamori upbringing and wherever he actually loved Subaru but couldn't recognize it or was in denial]] are mayor themes of analysis.
** Subaru also is a close contestant, as one can write essays about him, especially after his development in X1999.
* AngelDevilShipping: Seishirou and Subaru are set up to be this way, both physically and mentally. And in the end, [[spoiler: it isn't deconstructed - just made even MORE apparent!]]
* CryForTheDevil: Most of the "bad" people Subaru encounters are just normal people that were very, very broken to the point of lashing out, and the main lesson Tokyo Babylon teaches is that nobody should judge people's suffering but instead trying to understand them and thier reasons. The "Start" annex provides the quintessential quote.
-->''"Maybe people who do bad things...are just really lonely."''
** And yeah, it does include [[spoiler:Seishirou]].
* DracoInLeatherPants: Many fanfics downplay [[spoiler:Seishirou]]'s flaws and turn him into a possesive yet loving BastardBoyfriend, instead of a downright possesive, evil normal bastard.
* EvilIsSexy: Oh ''yes''. There's something on Sakurazukamori![[spoiler:Seishirou]] that is just so ''damn'' alluring.
* GrowingTheBeard: The first chapter barely touches social themes and comes across as a comedy. However, the beard appears next chapter.
* HoYay: See HoYay/{{CLAMP}} for details.
* ItWasHisSled: [[spoiler: Seishirou is: the Sakurazukamori, the man Subaru met nine years ago, a [[TheSociopath murderous sociopath]], and Hokuto's killer.]] The first two [[TheUntwist aren't much of a twist]], but the last two make for one hell of a WhamEpisode.
* MagnificentBastard: [[spoiler: Seishirou]] turns out to be a massive asshole. But he's one very, ''very'' stylish and efficient SOB. [[spoiler: And if anything, he becomes ''even more of a MagnificentBastard'' in Manga/{{X1999}}.]]
* MemeticMolester: Seishirou, thanks to a certain annex and his tendency to be... well, Seishirou.
* MindGameShip: One of the BEST examples of all time.
* {{Narm}}: You either laugh or facepalm with the OVA theme song "Kiss Kiss." It repeats the same {{Engrish}} words over and over.
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