History ShoutOut / HaruhiSuzumiya

** The aforementioned episode is also a shout out to ''Anime/StarBlazers'', which also took place on giant spaceships with giant cannons. The leader of the Computer club even quotes the CatchPhrase of ''Star Blazer'''s season 1 episodic villains by saying: "All hail the computer club!!!". The original line said by the villains every time they lost to the protagonists' crew being: "All hail the Gamilon Empire!!!"

** [[LightNovel/GoodLuckNinomiyaKun Tsukimura Mayu]] is also seen as one of the cards.

* In "Remote Island Syndrome Part II", the 'culprits' of the murder appear as black shadowed figures with slanted yellow eyes. This is also how unidentified criminals are portrayed in both the anime and manga of Manga/CaseClosed.
*** Anyone who has watched ''Manga/CaseClosed'' will instantly spot how each new character important to the mystery gets on-screen text stating their name, occupation, and age.

-->'''Tsuruya:''' Mikuru-chan, I want to [[ImTakingHerHomeWithMe take you home with meeee~~]]

* The novels take a lot from the atmosphere and story chops popularized by the ''LightNovel/BoogiepopSeries'', down to Haruhi's surname, which is likely taken from a secondary character from ''Boogiepop'' named Takako Suzumiya.

* While fighting the cave cricket, Itsuki [[CallingYourAttacks shouts]] "[[Anime/FullMetalPanicFumoffu Fumoffu!]]" and "[[Lightnovel/FullMetalPanic Second Raid!]]". Doubles as an ActorAllusion -- Creator/DaisukeOno had a minor role in FMP.

* In "Someday in the Rain", Kyon and Koizumi are playing a real [=TCG=] called Dragon All-Stars that features various anime/light novel characters; among the cards shown are [[LightNovel/{{Slayers}} "Lina and Naga" and a Gourry card]].

** Taniguchi's surname also likely comes from Masaki Taniguchi, one of the ''Boogiepop'' series leads. Ironically, while this Taniguchi is a huge pervert and a CasanovaWannabe, the one named Masaki stood out in-story for the opposite reasons yet was very popular with his female classmates.

** Yuki Nagato is an obvious ReiAyanamiExpy. Not only due to her overall character, but also to her name, which is basically a pun on Rei's. "Rei" can mean "cold" while "Yuki" can mean "snow", and Nagato and Ayanami were both Japanese warships that served in World War II.
** Koizumi resembles Kaworu Nagisa, actually even more than Yuki does to Rei Ayanami. Koizumi and Kaworu are both new transfer students with perpetual smiles, messy haircuts and hidden supernatural powers who belong to shadowy organizations, propose philosophical questions and extert homoerotic interactions with the main character. Later volumes only increase the similarities, as just like Nagisa is said to be not just an angel, but the incarnation of the most powerful of them, Koizumi's role is revealed to be [[spoiler:not a mere member of his organization, but their founder and most powerful esper.]]

* In the episode "Day of Sagittarius" the space battle sequences are a direct reference to the space battles from ''Anime/LegendOfGalacticHeroes''.

** Taniguchi's surname also likely comes from Masaki Taniguchi, one of the ''Boogiepop'' series leads.

** Yuki Nagato is an obvious ReiAyanamiExpy. Not only due to her overall character, but also to her name, which is basically a pun to Rei's. "Rei" can mean "cold" while "Yuki" can mean "snow", and Nagato and Ayanami were both Japanese warships that served in World War II.

** Koizumi echoes Kaworu Nagisa, actually more than Yuki to Rei Ayanami. Koizumi and Kaworu are both new transfer students with perpetual smiles, messy haircuts and hidden supernatural powers who belong to shadowy organizations, propose philosophical questions and extert homoerotic interactions with the main character. Later volumes only increase the similarities, as just like Nagisa is said to be not just an angel, but the incarnation of the most powerful of them, Koizumi's role is revealed to be [[spoiler:not a mere member of his organization, but their founder and most powerful esper.]]

%%* ''VisualNovel/{{Shuffle}}'', ''Princess Nine'', ''Anime/NeonGenesisEvangelion'', ''Anime/MobileSuitGundam'', ''{{Macross 7}}'', ''Touch'', ''VisualNovel/HigurashiWhenTheyCry'', ''VisualNovel/{{AIR}}'', ''StarBlazers'', ''VisualNovel/PhoenixWrightAceAttorney'' and other series.

* Yuki Nagato is an obvious ReiAyanamiExpy. Not only due to her overall character, but also to her name, which is basically a pun to Rei's. "Rei" can mean "cold" while "Yuki" can mean "snow", and Nagato and Ayanami were both Japanese warships that served in World War II.

* Koizumi echoes Kaworu Nagisa from ''Anime/NeonGenesisEvangelion'', actually more than Yuki to Rei Ayanami. Koizumi and Kaworu are both new transfer students with perpetual smiles, messy haircuts and hidden supernatural powers who belong to shadowy organizations, propose philosophical questions and extert homoerotic interactions with the main character. Later volumes only increase the similarities, as just like Nagisa is said to be not just an angel, but the incarnation of the most powerful of them, Koizumi's role is revealed to be [[spoiler:not a mere member of his organization, but their founder and most powerful esper.]]

* In "Remote Island Syndrome Part II", the 'culprits' of the murder appear as black shadowed figures with slanted yellow eyes. This is also how unidentified criminals are portrayed in both the anime and manga of Manga/DetectiveConan.
*** Anyone who has watched ''Manga/DetectiveConan'' will instantly spot how each new character important to the mystery gets on-screen text stating their name, occupation, and age.

** [[LightNovel/GoshuushouSamaNinomiyaKun Tsukimura Mayu]] is also seen as one of the cards.

* Each time Kyon wearily removes the frog costume during the "Endless Eight", he makes reference to a different anime/manga. For example: "Now I know how [[Anime/NeonGenesisEvangelion Unit 00]] felt after being hit by that beam." ([[WikiMagic Perhaps the other references can be identified here.]])

* In "Part 6", a rivalry between Mikuru Asahina and Yuki Nagato forms involving cosplay. When Mikuru dons a frog suit, Yuki cosplays as [[Franchise/{{Godzilla}} Godzilla]].

* Yuki Nagato is an obvious ReiAyanamiExpy. Not only due to her overall character, but also to her name, which is basically a pun to Rei's. "Rei" can mean "cold" while "Yuki" can mean snow, and Nagato and Ayanami were both Japanese warships that served in World War II.