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* GildedCage: For all that the people of Goodereste worry about her, Syalis is well cared for by her alleged captors. She eats better than most of the demons do, and nobody ever seeks to harm her. Every injury she suffers is the direct result of her going on an adventure to improve her sleeping conditions instead of staying in the quarters she's supposed to be locked up in.



* {{Kotatsu}}: Once winter comes around, Syalis goes around the castle gathering materials to make one. In a later chapter, she gets turned into a cat by accident and uses her reduced size as an opportunity to fit her entire body under the kotatsu for a nap.



* PlayAlongPrisoner: It becomes pretty clear that the Princess is a hostage in name only, and could leave anytime she felt like it.

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* PlayAlongPrisoner: It becomes pretty clear that the Princess is a hostage in name only, and could leave anytime she felt like it. After a while she even gets a flying machine, and the only thing she uses it for is to commute to various places to search for more sleep-enhancing items before coming back instead of trying to go home.

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* AnimalMotif: The princess has a bear motif, as shown by her association with the forehead devils, her bear print panties, her habit of sleeping all the time, and [[BearsAreBadNews her murderous rampages]].

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* AnimalMotif: The princess has a bear motif, as shown by her association with the forehead devils, teddy demons, her bear print panties, her habit of sleeping all the time, and [[BearsAreBadNews her murderous rampages]].



* ButtMonkey: Almost every demon in the castle qualifies when it comes to the Princess, but it's the Furoshikis that get her punishment the most. As animated beings of fabric, the Princess finds them ideal for textile purposes, so she has little inconvenience cutting and shredding through them for bedding, clothes, and almost anything she can muster. Almost every appearance of a Furoshiki ends up in the Princess using it for something.

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* ButtMonkey: Almost every demon in the castle qualifies when it comes to the Princess, but it's the Furoshikis shroud demons that get her punishment the most. As animated beings of fabric, the Princess finds them ideal for textile purposes, so she has little inconvenience cutting and shredding through them for bedding, clothes, and almost anything she can muster. Almost every appearance of a Furoshiki shroud demon ends up in the Princess using it for something.


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* ChristmasEpisode: Syalis writes a letter to Santa asking for a high-tech sleep pod, and knits a stocking large enough to hold it. However, the demons unanimously agree that she's the naughtiest person they know, and she wakes up in the morning to find the stocking full of coal and potatoes.

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* AntiDebuff: At one point the Princess is forcibly equipped with a status cancelling artifact after she gets herself killed using a giant poisonous mushroom as a mattress. To her dismay, this includes the status effect of sleep - even when it occurs naturally.



* PunnyName: The name of the human kingdom and its royal family, Goodereste.

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* PunnyName: The official English name of the human kingdom and its royal family, Goodereste.Goodereste. (This's apparently a {{Woolseyism}}, as the original Japanese name is Kaymin, which doesn't translate to 'good rest' or anything similar.)


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* StatusBuffDispel: At one point the Princess is forcibly equipped with a status cancelling artifact after she gets herself killed using a giant poisonous mushroom as a mattress. To her dismay, this includes the status effect of sleep - even when it occurs naturally.

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* DeathIsCheap: Thanks to the Demon Monk's ability to revive the dead, the poor souls the Princess uses for material are generally okay. Heck, the Princess herself has died a few times in her search for a sleeping spot. In spite of this, the mental and physical toll on the Demon Monk incurred by the Princess is enormous, as she's killed a mountain range's worth of demons on her own.

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* DeathIsCheap: Thanks to the Demon Monk's ability to revive the dead, the poor souls the Princess uses for material are generally okay. Heck, the Princess herself has died a few times in her search for a sleeping spot. In spite of this, the mental and physical toll on the Demon Monk incurred by the Princess is enormous, as she's killed a mountain range's worth of demons on her own. At one point the Princess is shown delivering a ''laundry basket'' full of demons she'd killed over the past week to the Monk for resurrection.


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* HeroOfAnotherStory: The efforts of the hero Sir Dawner to rescue the Princess mainly occur in the background while the story focuses on Syalis' efforts to improve the living conditions in her quarters while in nominal captivity.

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Tragedy has struck the human kingdom, for their beloved princess has been captured by the vile Demon King who has declared that he will only return her if the humans surrender the world to him.

What evils will Princess Syalis have to face while she waits for a brave and strong hero to rescue her?--is what the humans wonder, but the princess is more concerned with finding a nice place to get a good night's rest, and woe to anyone who gets in her way.

to:

Tragedy has struck the human kingdom, kingdom of Goodereste, for their beloved princess has been captured by the vile Demon King who has declared that he will only return her if the humans surrender the world to him.

What evils will Princess Syalis Aurora Sya Lis Goodereste have to face while she waits for a brave and strong hero to rescue her?--is what the humans wonder, but the princess is more concerned with finding a nice place to get a good night's rest, and woe to anyone who gets in her way.



* AntiDebuff: At one point the Princess is forcibly equipped with a status cancelling artifact after she gets herself killed using a giant poisonous mushroom as a mattress. To her dismay, this includes the status effect of sleep - even when it occurs naturally.



* BearyFriendly: The Forehead Devils, which're pretty much [[Toys/TeddyBear teddy bears]] with wings that are the universe's version of TheGoomba. The Princess tames them early on with her brushing technique and sometimes involves them in her schemes to fall asleep.

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* BearyFriendly: The Forehead Devils, Teddy Demons, which're pretty much [[Toys/TeddyBear teddy bears]] with wings that are the universe's version of TheGoomba. The Princess tames them early on with her brushing technique and sometimes involves them in her schemes to fall asleep.



* CardboardPrison: The demons might as well leave the Princess's cell door open for all the good it does. Later on, they just stop caring as long as she isn't wreaking havoc. It's even shown that the Princess, in spite of her penchant for escaping custody, has no intention of leaving Demon Castle even when she has all the capacity to do so, and then some.

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* CardboardPrison: The demons might as well leave the Princess's cell door open for all the good it does.does (if nothing else, the Teddy Demons will just give her another copy of the key for another round of brushing). Later on, they just stop caring as long as she isn't wreaking havoc. It's even shown that the Princess, in spite of her penchant for escaping custody, has no intention of leaving Demon Castle even when she has all the capacity to do so, and then some.



* EveryoneCallsHimBarkeep: While the Princess does have a proper name, she is almost exclusively referred to as "Princess". Similarly, most everyone calls the Demon King by his title, apart from Poseidon's elder brother Hades, who calls him Twilight.

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* EveryoneCallsHimBarkeep: While the Princess does have a proper name, she is almost exclusively referred to as "Princess". Even when her name is brought up, she's usually referred to by her middle name of Syalis rather than her first name of Aurora. Similarly, most everyone calls the Demon King by his title, apart from Poseidon's elder brother Hades, who calls him Twilight.



* IJustWantToHaveFriends: Poor Harpie just wants to have human friends. Unfortunately for her, the only human around is the princess.

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* IJustWantToHaveFriends: Poor Harpie just wants to have human friends. Unfortunately for her, the only human around is the princess.princess, whose sole interest in her is that her wings can be used as a down comforter.



* KillerRabbit: After making pajamas out of Forehead Devil fur, The Princess becomes a type of subspecies Forehead Devil that the others can call on when in trouble.

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* KillerRabbit: After making pajamas out of Forehead Devil Teddy Demon fur, The Princess becomes a type of subspecies Forehead Devil Teddy Demon that the others can call on when in trouble.


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* PunnyName: The name of the human kingdom and its royal family, Goodereste.
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* OlderThanTheyLook: Despite the Princess's childish appearance (and behaviour), she's old enough to have significant administrative duties at home. This is driven home when she asks just how old the demons think she is after being handed a pile of children's homework. She implies that the workload is part of why she's so obsessed with sleep, since she wasn't allowed to sleep until her duties were complete.

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* OlderThanTheyLook: Despite the Princess's childish appearance (and behaviour), she's old enough to have significant administrative duties at home. This is driven home when she asks just how old the demons think she is after being handed a pile of children's homework. She implies that the workload is part of why she's so obsessed with sleep, since she wasn't allowed to sleep until her duties were complete.complete (and since she has no official duties while a hostage other than to remain in the castle until rescued or ransomed, the only thing she can think of to do is sleep).



* PityTheKidnapper: The demons ''really'' didn't realise what they were letting themselves in for. The Princess is by far the worst thing they've ever had to deal with, but due to their vested interest in luring the Hero, they are completely unable to rid themselves of her.

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* PityTheKidnapper: The demons ''really'' didn't realise realize what they were letting themselves in for. The Princess is by far the worst thing they've ever had to deal with, but due to their vested interest in luring the Hero, they are completely unable to rid themselves of her.

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* NiceGirl: Harpis is about the sweetest character in the manga.

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* NiceGirl: Harpis Harpie is about the sweetest character in the manga.



* PityTheKidnapper: The demons ''really'' didn't realise what they were letting themselves in for. The Princess is by far the worst thing they've ever had to dealt with, but due to their vested interest in luring the Hero, they are completely unable to rid themselves of her.

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* PityTheKidnapper: The demons ''really'' didn't realise what they were letting themselves in for. The Princess is by far the worst thing they've ever had to dealt deal with, but due to their vested interest in luring the Hero, they are completely unable to rid themselves of her.



* SilkHidingSteel: The demons have absolutely no defenses against the Princess, and it's shown time and time again that they're at her complete mercy... and she's just a young girl.


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** The Demon Monk visualises the princess and the cat demon doing the classic ''Anime/DragonBallZ'' FusionDance move to merge in chapter 31.


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* SilkHidingSteel: The demons have absolutely no defenses against the Princess, and it's shown time and time again that they're at her complete mercy... and she's just a young girl.
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* OlderThanTheyLook: Despite the Princess's childish appearance (and behaviour), she's old enough to have significant administrative duties at home. This is driven home when she asks just how old the demons think she is after being handed a pile of children's homework. She implies that the workload is part of why she's so obsessed with sleep, since she wasn't allowed to sleep until her duties were complete.
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* IntercontinuityCrossover: ''Manga/KomiSanWaKomyushouDesu'' has an {{omake}} where the titular Komi finds herself in the castle and meets the Princess, and in true fashion, is captured by the demons for safe measure (though as far as Komi's concerned, it's AllJustADream), while this series has an omake where the Princess travels to Komi's world for a short while.

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* IntercontinuityCrossover: ''Manga/KomiSanWaKomyushouDesu'' ''Manga/KomiCantCommunicate'' has an {{omake}} where the titular Komi finds herself in the castle and meets the Princess, and in true fashion, is captured by the demons for safe measure (though as far as Komi's concerned, it's AllJustADream), while this series has an omake where the Princess travels to Komi's world for a short while.
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* AprilFoolsPlot: In chapter 94, the Princess takes the Demon King's April Fool's prank seriously, thinking the castle's about to be destroyed, and the demons have to convince her it's not actually true.


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* UnfortunateNames: The Demon Monk is deeply, deeply embarrassed by his real name, because he shares it with a demon who holds indecent feasts with witches.
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Ignored Epiphany implies she actually thought about, then dismissed, her affect on the demons. As written, the entry suggests nothing of the sort.


* HorrifyingTheHorror: The residents of the Demon King's Castle have nightmares about the Princess. [[IgnoredEpiphany She really couldn't give a shit.]] She is more evil than all the demons in the castle ''combined''.

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* HorrifyingTheHorror: The residents of the Demon King's Castle have nightmares about the Princess. [[IgnoredEpiphany She really couldn't give a shit.]] shit. She is more evil terrifying than all the demons in the castle ''combined''.
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Deleted entry has been posted here to consult whether it's actually an example.
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This seems... Excessively harsh for the gag nature of the manga. Between that and a part history of medicine tropes, I'm opting to delete this one entirely, but with plans to post it in the "is this an example thread"


* LackOfEmpathy: The Princess expresses absolutely no remorse for either the killings or the havoc she causes in the Demon King's castle, nor she responds to reason or pleas of mercy. She is both brutal and relentless, providing no reason for her behavior or justification for her actions.

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* HorrifyingTheHorror: The residents of the Demon King's Castle have nightmares about the Princess. [[IgnoredEpiphany She really couldn't give a shit.]]

to:

* HorrifyingTheHorror: The residents of the Demon King's Castle have nightmares about the Princess. [[IgnoredEpiphany She really couldn't give a shit.]]]] She is more evil than all the demons in the castle ''combined''.


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* LackOfEmpathy: The Princess expresses absolutely no remorse for either the killings or the havoc she causes in the Demon King's castle, nor she responds to reason or pleas of mercy. She is both brutal and relentless, providing no reason for her behavior or justification for her actions.
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* IntercontinuityCrossover: ''Manga/KomiSanWaKomyushouDesu'' has an {{omake}} where the titular Komi finds herself in the castle and meets the Princess (though as far as Komi's concerned, it's AllJustADream), while this series has an omake where the Princess travels to Komi's world for a short while.

to:

* IntercontinuityCrossover: ''Manga/KomiSanWaKomyushouDesu'' has an {{omake}} where the titular Komi finds herself in the castle and meets the Princess Princess, and in true fashion, is captured by the demons for safe measure (though as far as Komi's concerned, it's AllJustADream), while this series has an omake where the Princess travels to Komi's world for a short while.
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* ButtMonkey: Almost every demon in the castle qualifies when it comes to the Princess, but it's the Furoshikis that get her punishment the most. As animated beings of fabric, the Princess finds them ideal for textile purposes, so she has little inconvenience cutting and shredding through them for bedding, clothes, and almost anything she can muster. Almost every appearance of a Furoshiki ends up in the Princess using it for something.

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to:

[[caption-width-right:200:[[SilkHidingSteel The stuff of nightmares herself.]]]]



''Sleepy Princess in the Demon Castle'' (''Maou-jou de Oyasumi'', also known as ''Sweet Dreams in the Demon Castle'' and ''Sleeping Princess''), is a genre mix of SliceOfLife and high fantasy by Kumanomata Kagiji. Creator/VIZMedia has licensed the manga for English release.

to:

''Sleepy Princess in the Demon Castle'' (''Maou-jou de Oyasumi'', also known as ''Sweet Dreams in the Demon Castle'' and ''Sleeping Princess''), is a genre mix of SliceOfLife SliceOfLife, comedy and high fantasy by Kumanomata Kagiji. Creator/VIZMedia has licensed the manga for English release.


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* SilkHidingSteel: The demons have absolutely no defenses against the Princess, and it's shown time and time again that they're at her complete mercy... and she's just a young girl.

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* AMillionIsAStatistic: Princess Syalis has killed demons ''by the millions'' during her captivity without ever batting an eye.



* CardboardPrison: The demons might as well leave the Princess's cell door open for all the good it does. Later on, they just stop caring as long as she isn't wreaking havoc.

to:

* CardboardPrison: The demons might as well leave the Princess's cell door open for all the good it does. Later on, they just stop caring as long as she isn't wreaking havoc. It's even shown that the Princess, in spite of her penchant for escaping custody, has no intention of leaving Demon Castle even when she has all the capacity to do so, and then some.



* CuteButPsycho: The Princess is so cute when she finally sleeps you might be able to ignore all the demons she imprisoned, maimed, and/or killed in order to get everything just right.
* DeathIsCheap: Thanks to the Demon Monk's ability to revive the dead, the poor souls the Princess uses for material are generally okay. Heck, the Princess herself has died a few times in her search for a sleeping spot.

to:

* CuteButPsycho: The Princess is so cute when she finally sleeps you might be able to ignore all the demons she imprisoned, enslaved, maimed, and/or killed in order to get everything just right.
* DeathIsCheap: Thanks to the Demon Monk's ability to revive the dead, the poor souls the Princess uses for material are generally okay. Heck, the Princess herself has died a few times in her search for a sleeping spot. In spite of this, the mental and physical toll on the Demon Monk incurred by the Princess is enormous, as she's killed a mountain range's worth of demons on her own.



* NiceGirl: Harpis is about the sweetest character in the manga.



* PityTheKidnapper: The demons ''really'' didn't realise what they were letting themselves in for.

to:

* PityTheKidnapper: The demons ''really'' didn't realise what they were letting themselves in for. The Princess is by far the worst thing they've ever had to dealt with, but due to their vested interest in luring the Hero, they are completely unable to rid themselves of her.



* SpannerInTheWorks: The Princess is messing up the Hero's quest, and the Demon King's plans for a climactic battle, by appropriating magical artifacts intended for the Hero.

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* SpannerInTheWorks: The Princess is messing up the Hero's quest, and the Demon King's plans for a climactic battle, by appropriating appropriating/destroying magical artifacts intended for the Hero.
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** The princess occasionally uses the battle HUD from ''Franchise/{{Pokemon}}.

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** The princess occasionally uses the battle HUD from ''Franchise/{{Pokemon}}.''Franchise/{{Pokemon}}''.
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** The princess occasionally uses the battle HUD from ''Franchise/{{Pokemon}}.


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** When the princess' dream is shown in chapter 77, it resembles [[Franchise/SuperMarioBros the Mushroom Kingdom]] complete with floating blocks and tall rounded mountains.
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* OddballDoppelganger: Succyun the succubus looks remarkably like the Princess, but where the Princess is focused on sleeping, Succyun wants to become more popular (since succubi feed on human vitality, and so need to be popular to survive). Unfortunately for Succyun, she didn't fully appreciate the Princess's true nature until the Princess had become attached to her.

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* AnimalMotif: The princess has a bear motif, as shown by her association with the forehead devils, her habit of sleeping all the time, and [[BearsAreBadNews her murderous rampages]].

to:

* AnimalMotif: The princess has a bear motif, as shown by her association with the forehead devils, her bear print panties, her habit of sleeping all the time, and [[BearsAreBadNews her murderous rampages]].


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* BackgroundHalo: Inverted with the cover of volume 3, which has a blood-red crescent moon positioned in just the right spot to make it look like the princess has horns.
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* AnimalMotif: The princess has a bear motif, as shown by her association with the forehead devils, her habit of sleeping all the time, and [[BearsAreBadNews her murderous rampages]].
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* MoralityPet: The Princess shows genuine affection towards the eggplant seal, treating it as if it were her child.
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* ShoutOut:
** The people on the recurring infomercial resemble [[VideoGame/DragonQuestV Bianca and Nera]].
** One of the classes that the princess dresses up as in volume 3 is [[Franchise/SuperMarioBros a plumber which improves her jumping ability]].

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* CainAndAbel: Hades, the Demon King's elder brother, thinks he should have become king when their father died, and plans to take his brother's throne.



* EveryoneCallsHimBarkeep: While the Princess does have a proper name, she is almost exclusively referred to as "Princess". Similarly, most everyone calls the Demon King by his title, apart from his elder brother Hades, who calls him Twilight.

to:

* EveryoneCallsHimBarkeep: While the Princess does have a proper name, she is almost exclusively referred to as "Princess". Similarly, most everyone calls the Demon King by his title, apart from his Poseidon's elder brother Hades, who calls him Twilight.
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** In chapter 61, the Eggplant Seal evolves into a larger form. A ''much'' larger form.

to:

** In chapter 61, the Princess's Eggplant Seal evolves into a larger form. A ''much'' larger form.



* MergingMistake: One of the Princess' resurrections sees her accidentally get merged with a demon cat, coming back in its body. The Demon Monk manages to undo it, but not until after the cat-Princess wrangles him into smuggling her back to her cell to spend several hours sleeping under the kotatsu.

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* MergingMistake: One of the Princess' Princess's resurrections sees her accidentally get merged with a demon cat, coming back in its body. The Demon Monk manages to undo it, but not until after the cat-Princess wrangles him into smuggling her back to her cell to spend several hours sleeping under the kotatsu.



* SpellMyNameWithAnS: Is the Princess' name "Syalis", "Suya Rhys", or "Suyaris"? Th Viz release of the manga goes with "Syalis".

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* SpellMyNameWithAnS: Is the Princess' Princess's name "Syalis", "Suya Rhys", or "Suyaris"? Th According to the Viz release of the manga translation, her full name has it as "Sya Lis", but everyone in-universe goes with "Syalis".

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* BeCarefulWhatYouWishFor: According to the volume 2 extras, the baku wanted quantity over quality for nightmares... then the Princess showed up, and he ended up getting so many nightmares he got indigestion.

to:

* BeCarefulWhatYouWishFor: BeCarefulWhatYouWishFor:
**
According to the volume 2 extras, the baku wanted quantity over quality for nightmares... then the Princess showed up, and he ended up getting so many nightmares he got indigestion.indigestion.
** The demons spend an entire week trying to get the Princess to act more like a hostage, but every plan fails. The one plan that does seem to work though ends up backfiring as everyone becomes hurt and depressed at having the Princess treat them like vile monsters (even though she was faking it).

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* InnocentInnuendo: The Princess ends up causing a mass nosebleed epidemic in chapter 40 by asking everyone if they love her (because it was Valentine's Day and she wanted chocolate to help her fall asleep, having no idea what it means when a girl her age asks people if they love her).

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* InnocentInnuendo: InnocentInnuendo:
**
The Princess ends up causing a mass nosebleed epidemic in chapter 40 by asking everyone if they love her (because it was Valentine's Day and she wanted chocolate to help her fall asleep, having no idea what it means when a girl her age asks people if they love her).
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Added DiffLines:

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/cover_10.jpg]]

Tragedy has struck the human kingdom, for their beloved princess has been captured by the vile Demon King who has declared that he will only return her if the humans surrender the world to him.

What evils will Princess Syalis have to face while she waits for a brave and strong hero to rescue her?--is what the humans wonder, but the princess is more concerned with finding a nice place to get a good night's rest, and woe to anyone who gets in her way.

''Sleepy Princess in the Demon Castle'' (''Maou-jou de Oyasumi'', also known as ''Sweet Dreams in the Demon Castle'' and ''Sleeping Princess''), is a genre mix of SliceOfLife and high fantasy by Kumanomata Kagiji. Creator/VIZMedia has licensed the manga for English release.
----
!Tropes:
* AnthropomorphicPersonification:
** The spirit of the grimoire [[Franchise/CthulhuMythos Al Azif]] manifests as a young boy in Ancient Egyptian-style clothing.
** Morpheus describes himself as being like the embodiment of sleepiness.
* AttackOfTheFiftyFootWhatever:
** The Princess in chapter 59, although it's only temporary.
** In chapter 61, the Eggplant Seal evolves into a larger form. A ''much'' larger form.
* BeCarefulWhatYouWishFor: According to the volume 2 extras, the baku wanted quantity over quality for nightmares... then the Princess showed up, and he ended up getting so many nightmares he got indigestion.
* BearyFriendly: The Forehead Devils, which're pretty much [[Toys/TeddyBear teddy bears]] with wings that are the universe's version of TheGoomba. The Princess tames them early on with her brushing technique and sometimes involves them in her schemes to fall asleep.
* CainAndAbel: Hades, the Demon King's elder brother, thinks he should have become king when their father died, and plans to take his brother's throne.
* CardboardPrison: The demons might as well leave the Princess's cell door open for all the good it does. Later on, they just stop caring as long as she isn't wreaking havoc.
* ChildhoodFriendRomance: In a manner of speaking. The princess and the hero are childhood friends and are engaged... but the princess doesn't even remember the hero's face or name (and doesn't really care to remember) because he apparently made so little of an impression on her when they were young (her image of his face is {{henohenomoheji}}, representing anonymity).
* ComedicSociopathy: Courtesy of the Princess. She has free run of the Demon King's castle, and regularly terrifies its inhabitants, but it's all in the name of nothing more than a good night's sleep.
* CuteButPsycho: The Princess is so cute when she finally sleeps you might be able to ignore all the demons she imprisoned, maimed, and/or killed in order to get everything just right.
* DeathIsCheap: Thanks to the Demon Monk's ability to revive the dead, the poor souls the Princess uses for material are generally okay. Heck, the Princess herself has died a few times in her search for a sleeping spot.
* TheDreaded: As shown in one chapter with a baku responsible for purifying everyone's dreams, the princess is ''literal'' NightmareFuel to the denizens of the Demon Lord's castle.
* EveryoneCallsHimBarkeep: While the Princess does have a proper name, she is almost exclusively referred to as "Princess". Similarly, most everyone calls the Demon King by his title, apart from his elder brother Hades, who calls him Twilight.
* ExoticEyeDesigns: The Princess has stars in her eyes, which the volume 1 extras state is the mark of the royal family. Al Azif, meanwhile, has pentacle-shaped pupils.
* FailedASpotCheck: Hades manages to completely miss the havoc the Princess causes when she's at his place.
* FountainOfYouth: The Princess stumbles on one while looking for something to make her smaller, and it temporarily turns her into a kid.
* FriendToAllChildren: About the only demons safe from the Princess are either really small and cute or are children.
* GoofyPrintUnderwear: The Princess typically has knitted wool bear print panties for cold weather.
* HornedHumanoid: The Demon Monk, Demon King and Hades.
* HorrifyingTheHorror: The residents of the Demon King's Castle have nightmares about the Princess. [[IgnoredEpiphany She really couldn't give a shit.]]
* IJustWantToHaveFriends: Poor Harpie just wants to have human friends. Unfortunately for her, the only human around is the princess.
* {{Idiosyncrazy}}: Everything the Princess does is in the name of getting a good night's sleep. Escaping? Getting rescued? Making friends? She couldn't care less. She just wants a nice comfy sleep.
* InnocentInnuendo: The Princess ends up causing a mass nosebleed epidemic in chapter 40 by asking everyone if they love her (because it was Valentine's Day and she wanted chocolate to help her fall asleep, having no idea what it means when a girl her age asks people if they love her).
** Becomes something of a {{running gag}}, as often the Princess will want something mundane only for it to sound like flirting or even a sexual proposition. Such as the time she wanted to sleep in other demons' beds to see how they feel.
* IntercontinuityCrossover: ''Manga/KomiSanWaKomyushouDesu'' has an {{omake}} where the titular Komi finds herself in the castle and meets the Princess (though as far as Komi's concerned, it's AllJustADream), while this series has an omake where the Princess travels to Komi's world for a short while.
* JerkAss: [[HumansAreTheRealMonsters The Princess]] is hands down the most evil person in the manga.
* KillerRabbit: After making pajamas out of Forehead Devil fur, The Princess becomes a type of subspecies Forehead Devil that the others can call on when in trouble.
* LimaSyndrome: After the Princess gets kidnapped from the demons and returns, it's implied the demons are starting to suffer this, worrying about what'll happen when the Hero finally rescues her.
* MergingMistake: One of the Princess' resurrections sees her accidentally get merged with a demon cat, coming back in its body. The Demon Monk manages to undo it, but not until after the cat-Princess wrangles him into smuggling her back to her cell to spend several hours sleeping under the kotatsu.
* MundaneUtility: The princess is a master of taking powerful weapons, sacred artifacts, and even an ancient book of incredibly powerful magic and using it all to just try and make her room perfect for sleeping.
* NoSelfBuffs: At one point, the princess casts a high level sleep spell, only for it to knock out everyone in the castle ''except'' her.
* NoSenseOfDirection: The Hero's apparently had a terrible sense of direction since he was young.
* OurDemonsAreDifferent: Teddy bears with wings, literal {{Bed Sheet Ghost}}, a humanoid pile of car tires? Yup.
* PityTheKidnapper: The demons ''really'' didn't realise what they were letting themselves in for.
* PlayAlongPrisoner: It becomes pretty clear that the Princess is a hostage in name only, and could leave anytime she felt like it.
* PottyEmergency: The princess runs into one of these when the usual toilet near her cell is getting changed. She tries finding another toilet, but [[RealityEnsues most of the demons use toilets that she can't use because of their species]]. In the end, she ends up using the Demon King's private restroom, much to the chagrin of the Demon King, who also needed to use the restroom.
* RPGMechanicsVerse: Status conditions, experience points, and item crafting are all mentioned at different points in the series.
* {{Sleepyhead}}: The princess. It's her most defining characteristic.
* SpannerInTheWorks: The Princess is messing up the Hero's quest, and the Demon King's plans for a climactic battle, by appropriating magical artifacts intended for the Hero.
* SpellMyNameWithAnS: Is the Princess' name "Syalis", "Suya Rhys", or "Suyaris"? Th Viz release of the manga goes with "Syalis".
* TooDumbToLive: The Princess doesn't have much in the way of common sense, and has died a few times because her need for a comfy sleeping spot outweighed her sense of self-preservation.
* WeightWoe: The Princess is not pleased to be told she's got fat, and starts trying to slim down.
* WholeEpisodeFlashback: Chapter 41 takes place a few days after the Princess first arrives at the castle.
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