History Manga / SleepyPrincessInTheDemonCastle

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** The Neo Gearbolter portion of chapter 24/episode 6 is one big nod to ''Franchise/NeonGenesisEvangelion'', with its creator, Professor Gearbolt, resembling Gendou Ikari (and even doing a number of his poses), the place where Neo Gearbolter was being kept looking a lot like the docking area of EVA-01, and the Magnespear eventually being uses like the Spear of Longinus.

** The Neo Gearbolter portion of chapter 24/episode 6 is one big nod to ''Anime/NeonGenesisEvangelion'', with its creator, Professor Gearbolt, resembling Gendou Ikari (and even doing a number of his poses), the place where Neo Gearbolter was being kept looking a lot like the docking area of EVA-01, and the Magnespear eventually being uses like the Spear of Longinus.

* AnthropomorphicPersonification: The spirit of the grimoire [[Franchise/CthulhuMythos Al Azif]] manifests as a dark-skinned young boy in Ancient Egyptian-style clothing.

** There's another pair of mutual omakes with ''Tonikaku Kawaii'', commemorating both series' anime in the Fall 2020 season, with the Princess showing up out of nowhere to try out sleeping with Nasa and Tsukasa.

** Chapter 149's title is ''[[Franchise/TheIdolmaster THE pRINCESS M@STER]]''.

''Sleepy Princess in the Demon Castle'' (魔王城でおやすみ, ''Maōjō de Oyasumi'', literally ''Sweet Dreams in the Demon King Castle''), is a genre mix of SliceOfLife, comedy and high fantasy written and illustrated by Kumanomata Kagiji since 2016 for Shogakukan's ''Weekly Shōnen Sunday'' series and licensed for English release by Creator/VIZMedia. It also has an anime adaptation directed by Mitsue Yamazaki for Creator/DogaKobo, premiering in October 2020.

* PunBasedTitle: The Japanese title of the series, 魔王城でおやすみ / "Sweet Dreams in the Demon King Castle", is also a [[FunWithHomophones homophone]] of 魔王女でおやすみ / "[[HeroicComedicSociopath Sweet Dreams from the Demon Princess]]".

** Chapter 17/episode 4 has a one-and-a half page/minute long ''Manga/DetectiveConan'' recreation, with the princess showing up in a Demon King Castle newspaper a la Shinichi Kudo and an explanation of how she wound up with the body of a child, as a just barely different version of Conan's {{Leitmotif}} plays in the background in the anime version.

* ResetButton: If the Princess adds something to her, odds it will be removed later. Episode 4 of the anime sees her kill the [[ExactlyWhatItSaysOnTheTin Rocket Turtle]] and use his shell as a bathtub. Later in the episode she [[ItMakesSenseInContext tricks the ice demons into making her an igloo from the Ice Golem, acting as her personal air conditioners, and giving her a trio of]] [[RidiculouslyCuteCritter Eggplant]] [[SweetSeal Seals]] to sleep with. Both alterations are undone by Syberian who makes her put things back the way they were.

** Episode 4 of the anime has a minute long ''Franchise/LupinIII'' recreation, with the princess stealing stuff and showing up in a Demon King Castle newspaper a la Lupin in his various series, as a just barely different version of Lupin's {{Leitmotif}} plays in the background.

** Episode 4 of the anime ends with an extended ''Franchise/LupinIII'' recreation, with the princess stealing stuff and showing up in a Demon King Castle newspaper as a just barely different version of Lupin's {{Leitmotif}} playing in the background.

* ChaoticEvil: While the Demons of now are friendly, it has been repeatedly mentioned that before, they were more or less evil and wars were caused between them and the humans. This naturally caused a divided line between the two races. Those like Twilight and [[spoiler: even his father at one point]] try to bridge the two races from the past.

** The hero and his companions have names relating to waking people up. The two revealed so far are Sir Dawner (Japanese name Akatsuki, which translates to "dawn"), referencing waking at dawn, and one of his companions is Waker, which is self-explanatory.

* WholeEpisodeFlashback: Chapter 41 is set in the past, taking place a few days after the Princess first arrives at the castle.

* AnthropomorphicPersonification: The spirit of the grimoire [[Franchise/CthulhuMythos Al Azif]] manifests as a young boy in Ancient Egyptian-style clothing.

* RunningGag: The anime has the Princess knock her brush against her bars and the Teddy Demons come floating over with the keys to her cell over multiple quests and episodes to play up what a CardboardPrison her cell actually is.

** In Japanese, the "teddie demons" are でびあくま, which can read as either "devi-devils" (でび-あくま) or a {{Portmanteau}} of "devious bears" (でびあ-くま).
** Similarly, in Japanese a panda variant of the teddie demons with one demon wing and one angel wing are called パンだてんし, a {{Portmanteau}} of パンダ / "Panda" and だてんし / "Fallen Angels", i.e. "Fallen Pandangels".

* InsaneTrollLogic: The Princess's reasoning for having the Demon Cleric substitute for her mother:
-->"If we were to swap the gender of 'Grandpa' and make him a generation younger, wouldn't he be a 'Mother' instead?"...

** The hero and his companions have names relating to waking people up. The the two revealed so far are Sir Dawner (Japanese name Akatsuki, which translates to "dawn"), referencing waking at dawn, while one of his companions is Waker, which is self-explanatory.

* HornedHumanoid: Multiple demons looks like humans with various types of animal horns on their heads. This includes the Demon Cleric having goat horns, The Demon King Twilight and Former Demon King Midnight having bull horns, and Hades having antelope horns.