** Well, Kafuka ''is'' a GenkiGirl and she wears [[HairDecorations hair decs]] like Haruhi.

* So, in other words, he's a male equivalent of [[Franchise/DanganRonpa Junko Enoshima]] ? [[OhCrap Oh shit.]] This can't end well.

* Or, they are all a bunch of supers in a certain [[VisualNovel/{{Danganronpa}} high school]]. With Itoshiki as the unluckster. (or maybe a previous graduate....)

The series has made some direct references to ''{{Peanuts}}'', and this makes a surprisingly large amount of sense:

[[WMG:Itoshiki is immortal.]]

* This also explains why he's suicidal. WhoWantsToLiveForever?

There will be at least one ''Anime/PuellaMagiMadokaMagica'' [[ShoutOut reference]] / [[ProductPlacement plug]] [[OnceAnEpisode per episode]], just like ''[[LightNovel/HaruhiSuzumiya Haruhi]]'' in ''Manga/LuckyStar'' (especially with Kafuka and Kyoko [[AiNonaka sharing a VA]]).

[[WMG:Sayonara Zetsubou Sensei is the personification of TvTropes {{expy}} in the form of an anime.]]
While it is true that SZS focuses only on social and cultural tropes that apply to UsefulNotes/{{Japan}}, you notice that in every episode, Itoshiki-sensei introduces a trope in a form of a rant and then his students chip in and bring up examples including [[PlayingWithATrope subversions, inversions, deconstructions and other ways of playing with a trope]], all in an entertaining form, just like TvTropes.

[[WMG: Nozomu ends up on LawAndOrder.]]

[[WMG: GenUrobuchi and KoujiKumeta know each other, and ''Madoka Magica'' was meant as sort of a spoiler to the ending of ''SZS''.]]

There will be at least one ''Anime/PuellaMagiMadokaMagica'' [[ShoutOut reference]] / [[ProductPlacement plug]] [[OnceAnEpisode per episode]], just like ''[[LightNovel/HaruhiSuzumiya Haruhi]]'' in ''LuckyStar'' (especially with Kafuka and Kyoko [[AiNonaka sharing a VA]]).

The story will end in a simple way. Kafuka will finally snap and just kill ''everyone'' and then kill herself. The only survivor will be Itoshiki who will promptly try to kill himself, and fail again.
* At this point, he will realise how lucky he is to be alive, and will, for once, feel joy.
* Alternatively he could end up witnessing God's Last message to His creation and finally understand happiness, thus ending his term in purgatory.

[[WMG: [[HeyItsThatVoice Kou from Arakawa Under The Bridge and Izaya from Durarara]] are members of the Itoshiki family.]]

[[WMG:Itoshiki is a distant relative/alternate universe version of Bernard Black from BlackBooks.]]

** Meru, on the other hand, could be borderline or undifferentiated schizophrenic. [[TourettesShitcockSyndrome Coprolalia]], [[InnocentFanserviceGirl no nudity taboo]], [[GenreSavvy bizarre delusions that she's in an anime]], [[EmotionlessGirl negative affect]]... they all fit.

The world portrayed in ''Sayonara Zetsubou Sensei'' is very similar to Hell as shown in ''Main/JohnnyTheHomicidalManiac'' - just like Earth, but a bit weirder, and everybody is constantly driven to despair by minor annoyances. This means that Itoshiki died by suicide in the first episode for a crime which made him a target of [[Manga/DeathNote Light Yagami]]. Light set Itoshiki's death to some time after the end of his natural lifespan, which is why he was able to survive a death note-induced heart attack - the reason he didn't die is that he was already dead.

[[WMG: Mr. Despair is a [[JohnnyTheHomicidalManiac Waste-Lock/Flusher]] ]]