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Overprotective Dad has been disambiguated
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* AccidentalProposal: When her father and his tribe try to traverse Wicked Forest, said parent goes OverprotectiveDad and tries to drag her home, by force, to push her into the very same ArrangedMarriage she fled from. As to be expected, this pisses off Yuki beyond measure, the two men fight, and Yuki states that as long as Lyuu wants to stay, he will cherish and protect her. It isn't but a matter of seconds when Yuki realized that such a line is a marriage proposal in many cultures, including the tribe Lyuu's from.
to:
* AccidentalProposal: When her father and his tribe try to traverse Wicked Forest, said parent goes OverprotectiveDad gets overprotective and tries to drag her home, by force, to push her into the very same ArrangedMarriage she fled from. As to be expected, this pisses off Yuki beyond measure, the two men fight, and Yuki states that as long as Lyuu wants to stay, he will cherish and protect her. It isn't but a matter of seconds when Yuki realized that such a line is a marriage proposal in many cultures, including the tribe Lyuu's from.
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Shana Clone is now a disambig
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* ShanaClone: Aside from lacking ACupAngst, she's this. And it's justified in that she's a Supreme Dragon and could easily depopulate the entire world if she wanted to.
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* AsskickingEqualsAuthority: Strongest member of the church, even beating Nell, and its leader.
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* AsskickingEqualsAuthority: AsskickingLeadsToLeadership: Strongest member of the church, even beating Nell, and its leader.
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An Axe To Grind is no longer a trope
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* AnAxeToGrind: He prefers war-axes as his WeaponOfChoice.
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Disambig. per TRS
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* KnifeNut: She has reached the third level of dagger mastery using the dagger Yuki gifted her. She's so skilled, she can literally disarm people with it.
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Characters for Literature/NowImADemonLordHappilyEverAfterWithMonsterGirlsInMyDungeon.
Beware unmarked spoilers.
[[foldercontrol]]
! Protagonist
[[folder: Yuki]]
--> Race: Arch Demon [[spoiler: Demon Lord]]
----
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/41830074_2175871609320624_379480869070438400_n.jpg]]
[[caption-width-right:320:Bow before the great demon lord!]] Originally a human from Earth, but reincarnated as a Demon Lord and bound to a dungeon.
* AccidentalMarriage: To Illuna. He was unaware that letting her drink his blood is a sacred marriage covenant among the vampire race, until Leficious spells it out for him much later. Illuna, who asked permission, did know, but refused to enlighten him...
* AccidentalPervert: Teleporting home from the Demon Kingdom, he comes face to face with Nell, topless, because she's changing in his throne room, ''a public place.'' Awkward doesn't even begin to cover the aftermath.
* AchievementsInIgnorance: Most of his accomplishments are a direct result of a lucky (or unlucky) accident.
* AnythingButThat: He is terrified of swarms of large bugs, and it's justified. Although he can easily beat any of the bugs of Haunted Forest in a one on one fight, or even when considerably outnumbered, these bugs terrify him because of their single-minded dedication to eliminate him on each and every encounter, and just keep coming until either something else catches their attention, or their entire nest is destroyed, caring not a whit about how many of their kin they have to sacrifice in the process.
* AwesomeByAnalysis: Played with. While he does occasionally have keen insight regarding his abilities and environment, his successes and failures are either due to having things explained to him or the result of pure accident. The best straight example is during his first encounter with Leficious, where he could smell honey on her breath, so he inferred that she had a powerful sweet tooth and he could use chocolate to persuade her not to attack him for trespassing in her territory.
* BadassPacifist: He prefers the peaceful solution whenever possible, as he hates gore and bloodshed. Provoke him, and consider yourself lucky if there's enough left of you to bury.
* BathtubBonding: When he fashions a spa, both Illuna and Leficious barge in on him and join him in its use.
* BerserkButton: Even if he's well aware that she can defend herself just fine, so much as the threat of harm to one of the ladies in his sphere of influence will make him flip his shit. This goes doubly so for Illuna. The last time some yahoos threatened her, he was only stopped from utterly annihilating the city where it occurred by Leficious pinning him to the ground and making him stop with a CooldownHug.
** If you're a pervert who gets off on brutalizing little kids, keep it to yourself when he's around, because if he catches you in the act, he will see red and kill you.
* BigBrotherInstinct: Mess with Illuna, and your life is forfeit.
* BodyguardingABadass: Though no slouch himself, anybody who threatens Lefi will get him angry enough to go totally postal on the threat.
* BornUnlucky: At level 1, all of his stats are 500+ except his luck, which is ''70''. Everybody else has better luck than that, including a slime he summons.
* BullyingADragon: It doesn't take long, after Leficious moves into his home, that he starts treating her like a BrattyHalfPint. She lets him do it because she finds it amusing.
* CombatPragmatist: It doesn't happen often, but when he faces someone stronger, more skilled, or both, he won't hesitate to fight dirty.
* ContagiousHeroism: Though he adamantly insists that he's not a "hero" and doesn't want to be known as one, his heroic virtues will rub off on you if you're around him long enough.
* DarkIsNotEvil: He's a Demon Lord, loves to decorate everything from his weapons and clothes to his buildings in dark, especially jet-black colors, and is an inherently good and noble individual.
* DeliberateInjuryGambit: In chapter 102, he takes a sword strike to his arm to avoid one to his head. While the sword is stuck, he uses his other arm to deal a fatal blow.
* DramaticIrony: Nell, the human "Hero", trained from a very young age to fight Demon Lords, sees Yuki, ''The Demon Lord'', as the perfect template upon which to model her idea of heroics. Many people lampshade this, though Yuki himself remains unaware.
* FantasticArousal: He learns that his demon's wings are erogenous zones when Leficious starts to rub them...
* FishOutOfWater: It takes him a great deal of time and effort to learn how to live in this new world.
* FlatEarthAtheist: Played with. While he was an Atheist on Earth, as he mentions in chapter 93, the moment he sets foot in a church "safe house" where the goddess is worshiped, and feels all the holy magic involved in the murals, he not only looks on in awe, but is quite willing to accept that said goddess might actually exist.
* FriendToAllChildren: As is revealed in chapters 94 and 95, while visiting an orphanage run by the same church that raised Nell, the children absolutely adore him, especially when he roleplays [[IfOnlyYouKnew "The Demon Lord"]]. The fact that he shared the meat of monsters he hunted earlier for them during a famine ''deliberately instigated by Prince Ryuit'' in his bid for power didn't hurt.
* GenreSavvy: To the point of LeaningOnTheFourthWall. He was an avid troper in his life on Earth, and speaks of tropes all the time concerning his situation, to the confusion of those around him.
* GoodCannotComprehendEvil: Downplayed. He can understand that criminals are scum. He can comprehend why knights under Prince Ryuit would try to provoke the church so he can publicly brand them rebels and hunt them down, but when said "knights" draw a sword and attempt to strike down a hungry orphan child for the "crime" of accidentally bumping into them with the very stew they're trying to confiscate, Yuki is offended into attacking.
* GoodFeelsGood: He does heroic things because he enjoys it.
* GoodIsNotNice: He's actually not that bad by western standards. But the standards of Japan, where the story is written, he's supposed to be extremely rude, crude, vulgar, and "an internet pedophile," even if he is actually quite decent and kind in person.
* GoodIsNotSoft: If he's given just cause to anger and violence, he will respond with maximum force and brutality, and he won't stop until the target(s) of his rage are LudicrousGibs, if they're lucky.
* HairTriggerTemper: Subtle, but present. Yuki is usually really fun to be around, but he has a very low "asshole threshold." While he will sincerely strive to get along with others, if you're the kind of dork who likes to go around looking for trouble, throw your weight around, give people grief to amuse yourself, or refuse to be "satisfied" unless you have responded to any offense against you, real, imagined, or entirely accidental, with violence, he will ''completely'' flip his shit, even if he's the one at fault, and do whatever it takes to beat you down.
* HeroWithBadPublicity: As a Demon Lord, he certainly inherited a bad reputation, but he is a good and noble character, and if you don't intentionally antagonize him, you've got nothing to worry about.
* HotBlooded: He throws his entire passion into everything he does, to wild and unpredictable effect.
* HumansAreInsects: When he's asked why he was giving an invading human army fair warning instead of simply slaughtering them, he equated the humans to insects. In truth, he thinks the invading human army was ''weaker'' than insects, and when comparing to the insects in Haunted Forest, he's right.
* IdealHero: Though he would adamantly insist otherwise, he is this. He acts in a heroic manner, purely for its own sake, not because he's expecting a reward, although he certainly wouldn't turn a reward down, and does act heroically because he enjoys doing so, or benefits from it.
* IgnorantOfHisOwnIgnorance: From the other end. Not only is he so powerful that he has problems relating to the "common sense" of this new world, but for most of volume 1, his entire basis for comparison is the one being even stronger than himself, the Supreme Dragon Leficious.
* ImNotAHeroIm: He '''hates''' "heroes", especially those who boast of their selflessness, and pointedly does not want to be one.
* IWarnedYou: When a hodge-podge army of mercenaries and various "noble" houses intrudes in his territory, seeking to "avenge their country's honor" as a direct result of him hunting down a slaver cartel, to rescue Illuna, while said cartel was operating (illegally) in their country, he goes to what he thinks is the top commander and warns him. Said commander warned his superiors, but was ignored. The warned commander wisely withdrew his squad. That squad survived. The rest? They got to help Yuki [[CruelAndUnusualDeath test out his new dungeon traps]].
* KirkSummation: To Nell, an official "Hero" of the human kingdom. With just a couple of well phrased sentences, he made her realize her actions were hardly heroic, and she was just an UnwittingPawn. She gets better.
%%* LikeAnOldMarriedCouple: With Leficious. The two of them act like they've been married for years.
* MagicEye: As a result of being a demon lord, he has a red eye that allows him to check the Dungeon "menu" at any time. He can also see the flow of magic, letting him predict an enemy's spells before they even finish casting.
* {{Manchild}}: He may ''look'' like a full-grown adult, but he has a very childish temperament. This is the aspect of his character Lefi loves and is annoyed by the most. It's also what makes him beloved by children as he can relate to them.
* MistakenForPedophile: All the time. Leficious ''only looks'' like a pre-teen, but is ReallySevenHundredYearsOld, and due to a cultural misunderstanding he's accidentally married to Illuna who actually is a pre-teen.
* MoralityChain: His very existence is the primary reason Leficious isn't currently going on rampages to slake her boredom.
* MundaneUtility: Remember that majestic castle? In times of peace, it's a massive theme park where the kids living in his dungeon can laugh and play, without a care in the world.
* TheNicknamer: He's fond of giving people amusing little nicknames in his head. He's not above making profane and vulgar nick-names for people he does not like. A certain black dragon gets the dubious honor of "Douche-lord."
* OneManArmy: Thinking he's entirely reliant on his dungeon to deal with armies is a suicidal mistake. A group of mass-murdering fiends that were attacking the winged demon clan, including the women and helpless children, and threatened Nell with rape, dismemberment, and death, ran across him. The moment Nell's unconscious form was sent off to safety... the aftermath was so horrific, the survivors slit their own throats in abject despair, save one, the leader, who wound up [[JackBauerInterrogationTechnique questioned by Yuki.]]
* RightForTheWrongReasons: After he's spent ''days'' designing the perfect castle, purely to awe the world with his magnificence as a Demon Lord, and then invested a massive amount of DP to actually build it, it proves way too large and unwieldy to actually live in. In any other time and place, this would have been a monumental boondoggle. In this story? It proves the ''perfect'' decoy, because armies, enemy scouts, and adventurers would presume that the Demon Lord, and his treasures, would be inside. As showcased when Nell invades the dungeon...
* RoaringRampageOfRescue: When he chases down Illuna's scent, tracking her back to the slaver cartel who kidnapped her, said cartel foolishly attacked him. Say hello to a pile of corpses and entrails splashed on the walls.
* RuleOfCool: In universe. He does strange (and often impractical) things because he's fascinated with projecting a "cool" image of himself.
* SecretlySelfish: Although he would adamantly insist otherwise, he is heroic in word, act, and mindset, but he internally admits that he does heroic things purely because he either benefits from doing so or actively enjoys it. This does not stop him from being an IdealHero.
* ShowyInvincibleHero: Invoked. Not only is it extremely gratifying to watch him obliterate armies of enemies like they're nothing, he goes out of his way to make sure this is the case.
* SuddenGameInterface: Discussed, Invoked, and Lampshaded. When he touches the dungeon-core, it scans his mind and tools a "menu" interface styled off the RPG games he's familiar with. He's then forced to see the world that way, especially when he uses the newly acquired "analysis" skill.
* TastesLikeFriendship: He "tames" Leficious, the Supreme Dragon, by offering her chocolate and other sweets that wouldn't otherwise be obtainable in this world.
* TheUnfettered: He lives by his own rules, on his own schedule, and only does things, or listens to people, that he wants to.
* UnskilledButStrong: Being a demon-lord, he can, and does, overpower most of his foes with sheer brute force. He's trying to become StrongAndSkilled so that he doesn't get overwhelmed by those who can gobsmack him with pure skill.
* UnstoppableRage: Yuki is usually pretty chill. When he gets pissed, he gets ''pissed'', and he won't stop until he's physically restrained, or his targets are dead.
* WhatsUpKingDude: Yuki cares not a whit about official titles or ranks. His opening greeting to the king of Alyssa is the trope, by name. The fact that he's a friendly Demon Lord, and there are few who could fight him on equal footing, and fewer still who would want to, helps him get away with it.
* WeirdnessMagnet: There is never a dull moment around him. Not only because he's prone to getting into fights, but because he as almost no concept of the local "common sense." The ladies in his life ''actually appreciate this'' as much as it also annoys them.
* WildCard: Despite being an IdealHero, he's not going to intervene in affairs that don't directly impact him. For example, the ongoing human/beast-kin war. Either army tries to pass through his territory? The other side just won itself a powerful ally.
* WouldNotHitAGirl: Slapstick on Leficious aside, he prefers to avoid hurting women, but if she's a serious threat and refuses to stand down... so be it.
* WouldNotHurtAChild: While it has yet to crop up much, seeing how remote his dungeon is, he does not like hurting children, and if he finds those who do, he tends to be quite... upset.
* YouAreWhatYouHate: He loathes heroes to the point of revulsion, seeing himself as a VillainProtagonist. Paradoxically, this is the trait that keeps him as an IdealHero... Which his internal dialog states is the kind that disgusts him most.
[[/folder]]
! Supporting Characters/Active Allies
[[folder: Leficious/Lefy]]
--> Race: Dragon.
----
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/32768020_2077149305859522_4346084446273798144_n.jpg]]
[[caption-width-right:320:Thou hast best appreciate mine, The Supreme Dragon's, benevolence, Demon Lord.]]The very first being Yuki meets in the new world.
* BecauseYouWereNiceToMe: The reason she dotes on Yuki and lets him smack her upside the head when she throws tantrums? He treats her like an equal and genuinely praises her honestly.
* BigEater: If left to her own devices, she would eat a week's worth of food for two people in a single sitting. And that's after transforming into her small humanoid body...
* BrattyHalfPint: She may be a millennia-old dragon, but she behaves like a spoiled middle-schooler, apparently because she [[LonelyAtTheTop didn't socialize much]] before meeting Yuki.
* DisproportionateRetribution: Annoy her, and a wing of 100 dragons will descend on your city, if she's feeling generous...
* FantasticArousal: Her dragon wings are every bit the erogenous zone that Yuki's demon wings are, as she discovers when Yuki starts fondling hers as she's fondling his...
* FriendlyAddressPrivileges: She allows those close to her, like Yuki, to call her Lefy.
* GodzillaThreshold: While she could ''easily'' devastate the royal capital, especially TheEvilPrince who keeps harassing and threatening him, Yuki is loathe to ask her to do it, because she's so powerful [[PowerIncontinence she lacks the fine control to keep from leveling the country in its entirety, by accident.]]
%%* HappilyMarried: Starting in chapter 133.
* HiddenDepths: While she may seem all but worthless as a Dungeon resident, outside her unwitting DP contribution, truth be told, she's an excellent mother and mentor, as Illuna and Yuki will happily testify, respectively.
* ItAmusedMe: The reason she goes on rampages, stomping demon lords, dungeons, and human cities flat? She's bored and wants amusement.
* LazyBum: Unless she's being actively entertained, she prefers to just loaf around.
* LethalChef: Justified. It's not a lack of knowledge or talent that's keeping her from being able to cook. Nor is it a lack of effort. It's PowerIncontinence. She has so much raw strength, even in her humanoid form, that she simply can't exert the proper fine muscle control to combine ingredients properly, nor even use a cooking instrument. She spent an entire night trying, and failing, to cook anything presentable, and ultimately wound up with "cookies" that looked and tasted awful. Yuki still accepted and ate them, with gratitude, [[SickeningSweethearts just to show he cares.]]
* LittleBitBeastly: If not for her horns and tail, she could easily pass for a human girl. She can actually hide those parts if she wants to visit a human city, but it doesn't feel right to her.
* NakedFirstImpression: She starts the story nude. As a dragon, this isn't an issue for Yuki. When she adopts a pre-teen human form...
* PersonOfMassDestruction: Even in her humanoid form, she can level countries, and ''easily'' smack down Yuki if she ever feels the need for violence.
* PhlebotinumBattery: The only reason she avoids PrettyFreeloader status is that her very existence in Yuki's dungeon provides a large amount of DP (dungeon points) that he can basically use like currency to create food, items, monsters, etc. She does, however, slowly begin to help out with chores as the story progresses. And later in the story, she isn't a PhlebotinumBattery anymore because she officially became part of Yuki's family through marriage.
* PowerIncontinence: Her power level is so great, that when she aids Nell to deal with a ZombieApocalypse, her ''weakest'' spells destroyed two houses, one by fire, and the other by flood.
* PropertyOfLove: While she hates Yuki's "Tamer of the Supreme Dragon" title, she openly admits in chapter 65 of the light novel that she loves it when he called her "his woman," in chapter 64 of the light novel after a gang of thugs proclaimed their intent to gang-rape and murder her, and stated that the law would do nothing about it because she's [[WhatMeasureIsANonHuman not human]]...
* RelationshipUpgrade: In chapter 133, she marries Yuki with a SacredFirstKiss. The squeeing was so loud, the fourth wall broke from ''both'' sides! Another relationship upgrade happens when it was confirmed in chapter 402 that she is pregnant with Yuki's child.
* ShamelessFanserviceGirl: She openly flaunts her naked body in front of Yuki, and when he loans her his shirt to cover herself, she teases him about "attacking her because of her beauty." She also sees nothing wrong with barging in on him when he's bathing.
* ShanaClone: Aside from lacking ACupAngst, she's this. And it's justified in that she's a Supreme Dragon and could easily depopulate the entire world if she wanted to.
%%* SickeningSweethearts: With Yuki.
* SoreLoser: If she's beaten in a contest, game, or anything, she will force rematches until she's either victorious or collapses from exhaustion, whichever comes first.
* SweetTooth: Her FatalFlaw. The fact that Yuki feeds her common Earth sweets, which she can't get anywhere else, is the primary reason she decided to be submissive to him.
* TopWife: In chapter 181, she informs Yuki of two very important facts. 1.) Polygamy is the law of the land in this new world. 2.) '''She''' will decide who else Yuki's going to marry, and lay down the ground rules, and infidelity will not go unpunished. Since she's the Supreme Dragon, Yuki can only meekly nod his head, covered in nervous sweat.
* VoluntaryShapeshifting: She can assume either her dragon or humanoid form at will. She chooses to remain humanoid for convenience in Yuki's dungeon, but she can make herself look fully human if she wants to visit a human city.
* YeOldeButcheredEnglish: How she speaks to display her "superiority" to others. It fades as she grows more and more comfortable in Yuki's home.
[[/folder]]
[[folder: Shii]]
-->Race: Slime
----
The first monster Yuki summoned.
* GoodThingYouCanHeal: Upon being summoned, she lunged at a level 21 cerberus, and got swatted into a wall. She was perfectly fine a few minutes later, but Yuki decided to keep her out of trouble after that.
* LikeBrotherAndSister: Once able to take on Illuna's appearance, the two laugh and play as if they're twin sisters who have lived together all their lives, and it's absolutely adorable.
* NoBiologicalSex: Slimes don't have genders, but she identifies as female because she's copying Illuna, aside from being blue and translucent.
* TheSilentBob: Yuki can somehow understand her perfectly, despite the fact that she has no speaking lines, at all.
* SuddenlyVoiced: Yuki comes home from a multiple-day "date" with Lefi in the nearby town to find she's taken on Illuna's appearance, aside from being blue and translucent, and able to speak fluently.
* TeamPet: Her primary role in the story.
* VoluntaryShapeshifting: Through means not fully understood, she learns to take on Illuna's form, aside from being blue and translucent.
[[/folder]]
[[folder: Illuna]]
-->Race: Vampire
----
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/32764899_2077148995859553_4715679421615308800_n.jpg]]
[[caption-width-right:320:Illuna is currently riding Mofir, with the slime Shii sitting on the fenrir's head.]] Yuki's child "bride."
* AccidentalMarriage: Averted. She certainly knew that asking for Yuki's blood was a marriage ritual, but never told him.
* BeCarefulWhatYouWishFor: She pleads with Yuki to free some fellow slaves from the slaver cartel that kidnapped her. Two of those female slaves wind up moving in...
* BreakTheCutie: A human slaver ring tried, repeatedly. [[TooDumbToLive They annoyed both Yuki and Lefy in the process.]]
* CheerfulChild: When treated kindly, she's a very sweet and upbeat child.
* ChildrenAreInnocent: While she does know that drinking someone's blood is a sacred marriage ritual, she doesn't comprehend what marriage is, and is in all other respects a sweet and innocent child without a trace of malice in her entire body.
* TheCutie: She's adorable on both sides of the fourth wall.
* DeceasedParentsAreTheBest: Her parents died fighting, in order to give her a chance to escape genocidal humans looking to kill or enslave her entire village.
* DoomedHomeTown: She is the LastOfHerKind as her home village was wiped out by humans.
* FantasticRacism: Defied. She ''should'' hate all humans without exception, but she doesn't. She even goes and mingles with a human "hero" and turns on Yuki for "bullying" her, after she tried to break into his home to kill him.
* HairOfGoldHeartOfGold: Blonde, and sweet all over.
* HappilyAdopted: Though she calls Yuki and Lefy "Big Brother" and "Big Sister" respectively, she's aware she's not related to them by blood, but she's very, very happy in their home.
* OurVampiresAreDifferent: Aside from drinking blood once a week, one would never know she's a vampire.
* WiseBeyondHerYears: Despite being 8 years old, tops, she knows better than to foolishly flail around against her kidnappers, or foolishly risk her life attacking them, instead biding her time until she can escape, and keeps her methods secret...
[[/folder]]
[[folder: Mofir]]
--> Race: Fenrir
----
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/32727614_2077149552526164_2582055461280808960_n_9.jpg]]
[[caption-width-right:320:Yes, boss.]]Monster summoned by Illuna from a gacha.
* AnimalCompanion: His role in the story.
* FluffyTheTerrible: His name essentially translates to Fluffy and he is one of the strongest creatures in the setting.
* IWasJustPassingThrough: At one point, he rescues a band of adventurers, that were rightly investigating the cause of a monster swarm headed to their home town, by attacking and killing the monster bearing down on them, because he happened to be hunting it, barely casting the adventurers a glance in the process. The adventurers in question wisely leave him alone, especially once they notice his collar...
* UndyingLoyalty: He will serve Yuki, and the residents of the Yuki dungeon, no ifs ands or buts.
[[/folder]]
[[folder: Leila]]
-->Race: Horned-sheep Demon.
----
One of two slaves rescued by Yuki who decided to stay in his dungeon, claiming it's because she wants to serve him to repay him for rescuing her.
* {{Bookworm}}: Reading is her favorite leisure activity.
* FamedInStory: When agents from the Demon King faction call on Yuki and see she's his maid, they're stunned, and indicate she's a celebrity in Demon lands.
* ForScience: The real reason she serves Yuki is that she sees it as a golden opportunity to study a Demon Lord, up close and personal. Being treated kindly is a very welcome bonus.
* HappinessInSlavery: A mix of the life-debt and beloved servant categories. She chooses to serve Yuki because he treats her kindly and because he saved her from AFateWorseThanDeath.
* HornedHumanoid: She has sheep's horns on her head, but is otherwise human.
* {{Meido}}: Her official role in Yuki's dungeon.
* MoodKiller: To the point of InterruptedIntimacy. Leila, of all people, interrupts the one and only scene in volumes one and two where Yuki and Lefy actually start getting ... frisky with each other, and shuts it down as effectively as if she poured a bucket of cold water on their heads.
* MysteriousWaif: There's a lot to her backstory that she's hiding.
* OurDemonsAreDifferent: Aside from the horns on her head, she could easily pass for a human.
[[/folder]]
[[folder: Lyuuinne Gyroll/Lyuu]]
-->Race: Beast-kin, subspecies, Warwolf.
----
The second slave rescued by Yuuki who decides to live in the Yuki dungeon, supposedly because she wants to be close to his pet Fenrir, which is sacred to warwolves.
* AccidentalProposal: When her father and his tribe try to traverse Wicked Forest, said parent goes OverprotectiveDad and tries to drag her home, by force, to push her into the very same ArrangedMarriage she fled from. As to be expected, this pisses off Yuki beyond measure, the two men fight, and Yuki states that as long as Lyuu wants to stay, he will cherish and protect her. It isn't but a matter of seconds when Yuki realized that such a line is a marriage proposal in many cultures, including the tribe Lyuu's from.
* AscendedFangirl: Of Mofir. Her race worships Fenrirs as gods. Being up close and personal to one is her greatest joy, to Mofir's annoyance.
* LittleBitBeastly: If not for her wolf ears and tail, she'd be a very attractive human woman.
* {{Meido}}: She also serves as a maid in Yuki's dungeon.
* RunawayBride: She fled an ArrangedMarriage to a guy she doesn't like, and she proves justified when we meet the clod, who thinks way, way too highly of himself and isn't long for this earth due to his combined MilesGloriosus and LeeroyJenkins lifestyle.
[[/folder]]
[[folder: Nell]]
[[quoteright:316:https://static.tvtropes.org/pmwiki/pub/images/32739206_2077150212526098_401217994908237824_n.jpg]]
[[caption-width-right:316:I won't let you hurt the innocent!]]A "hero" raised by the human church, and sent after Yuki by the overly ambitious and "patriotic" prince Ryuit Glorrio Allysia of the human kingdom to eliminate Yuki.
* AnguishedDeclarationOfLove: Immediately after Yuki saved her life, just before she fell unconscious, she blurts out "I love.." and passed out. Yuki turns in the direction of the fiends involved in harming her, and unleashed literal nightmare fuel upon all of them.
* BornLucky: Her luck skill is in the thousands!
* ChildSoldier: Deconstructed. She endured a great deal of training, and was given powerful abilities, but when she found herself in Yuki's "Haunted House," she completely broke down into a sobbing mess.
* TheDeterminator: Deconstructed and going into FatalFlaw territory. She will not give up in heroic pursuits, even ignoring her fatigue, until she either succeeds, or dies. Yuki, being highly concerned for her well-being, sees this as a flaw.
* HeroAntagonist: Briefly. She is a genuine hero, but as humanity's trump card, she just happened to be at odds with Yuki, until she met him in person and realized with her own eyes that he's not AlwaysChaoticEvil like other Demon Lords she was briefed on.
* HeroesPreferSwords: She does, though she treasures the Dagger Yuki gifted her that he forged, either from the leftovers in making Zaien, or in the research process leading up to said creation. Either way, since it's a weapon far, ''far'' better than anything she could ever hope to come across, she diligently trained in mastering its use.
* HeroicWannabe: A rare positive example. Despite already having the "Hero" title, she wants to be known as a hero for the merit of her words and actions, not because some priest somewhere said "you're the hero, now go slay our country's enemies with gusto!" Even Yuki, who ''loathes heroes to the point of revulsion'' respects her dedication to this, and treats her kindly.
* HiddenBuxom: According to Yuki, her armor hides a decent pair of tits, which he gets to spot due to the fact [[AccidentalPervert that she was changing in his throne room when he teleported in.]]
* HoldTheLine: In protecting the helpless women and children of Winged Dragon Clan, she sets up a barrier and then faces the entire enemy army, head on, so that the helpless can flee, and call for help, and she holds them off ''all night long.''
* HorribleJudgeOfCharacter: While her assessment of Yuki and Lefy is quite correct, her assertion that Prince Ryuit is a good person, [[WellIntentionedExtremist or at least means well]], is way off the mark.
* KnifeNut: She has reached the third level of dagger mastery using the dagger Yuki gifted her. She's so skilled, she can literally disarm people with it.
* PerpetualPoverty: The primary reason she agreed to become "the hero" is that her family's well below the poverty line, and the church promised them just a bit better lifestyle.
* PervertRevengeMode: Double Subverted. When Yuki teleports into his throne room, a public place, and he sees her topless, they both freeze and their eyes lock for some time. When Yuki's brain finishes rebooting, he makes an off-hand comment admiring her breasts. She pelts him in response.
* SkilledButNaive: She is indeed quite talented with the sword, but she's easily fooled and tends to "go with the flow" way too quickly.
* SureLetsGoWithThat: When her superior Carlotta gives her an assessment of Yuki and his motivations for helping the church deal with the EvilPrince that is giving them all grief, she lampshades the trope by name, since Carlotta's assessment is marginally correct.
* UnwittingPawn: She was sent to attack Yuki under the premise that he was threatening "innocent people." When Yuki pointed out how anything-but-innocent his victims were, she stood down completely.
* WackyMarriageProposal: Possibly the wackiest in fiction or reality. In chapter 181, Lefi announces to Yuki that the household would be thrilled at Nell being the newest wife, with Nell herself in attendance, blushing, squirming, and squeeing like the SmittenTeenageGirl she is. Coming from modern Japan, Yuki's brain goes "Does not compute."
[[/folder]]
[[folder: Zaien]]
A sword Yuki forges from a cursed axe he confiscates from the villain Dorga, and a discarded "hero's sword" he finds in a weapon shop and buys for cheap.
* AffectionateNickName: Once she sports a humanoid avatar, Yuki is fond of calling her Enne, and she likes it.
* BecauseYouWereNiceToMe: She's tickled pink to be Yuki's sword, because he dotes on her, talks to her, and treasures her, as opposed to all the other wielders who let the evil spirits take them over, or were even worse, and just lashed out with abandon, until they died, and joined the howling maelstrom of malevolence.
* {{BFS}}: Is one. As a sword, is so massive, even Yuki with his Arch-demon SuperStrength can barely wield it.
* BloodKnight: Combined with HungryWeapon Even though Yuki's forging process removes the curse and makes the vengeful souls happy to serve, the weapon is still quite literally bloodthirsty, [[LesserOfTwoEvils but hey, "baby steps."]]
* ComicallySerious: She's very dead-pan and stiff, taking everything way too seriously, but she still pouts like a little kid and beams wholeheartedly when her few wishes get granted. [[DotingParent This makes Yuki want to spoil her rotten.]]
* DeathSeeker: While still trapped in the cursed axe briefly wielded by Drogan. She's ''ecstatic'' when Yuki took possession because he muted, if not eliminated, the screeching, howling, blood-crazed voices of the malevolent spirits that she was stuck with and were drowning her out.
* EmpathicWeapon: It's self aware and serves Yuki willingly.
* HatesBeingAlone: Wants to be at Yuki's side, constantly, and hates being placed in storage. As big as she is, this causes issues.
* NoBiologicalSex: As expected of a sword, she has no gender but identifies as female, purely because it feels comfortable.
* OurPhlebotinumChild: As Lefi herself lampshades.
-->'''Lefi:''' "I would have never dreamed that you would literally make a child with your own hands simply because two children is not enough for you!"
* SuddenlyVoiced: She speaks to Yuki, in the presence of Lefi in chapter 120, shocking both of them.
* SympatheticPOV: We get to see how she became sentient and what she thinks of being Yuki's weapon for the vast majority of chapter 120.
* UndyingLoyalty: Lives and would die for Yuki, without hesitation.
* WhenSheSmiles: ''Everybody'' absolutely melts when they see her smile.
[[/folder]]
! Antagonists
[[folder: Prince Ryuit Glorrio Allysia]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/ryuit.jpg]]
[[caption-width-right:350:That cowardly king will doom us all!]]The prince of the kingdom of Allysia
* AmbitionIsEvil: His PatrioticFervor makes him want to expand his country's borders at all costs, and only sees Haunted Forest as prime grade A real-estate, ripe for development. He doesn't care who he has to step over to get it.
* BullyingADragon: Quite literally. Since he has deluded himself into thinking that Haunted Forest is populated only by mindless beasts, and there ''is no Supreme Dragon Leficious'', he keeps sending troops, trying to provoke said "mythical" dragon by attacking her home, wholly overconfident in the strength of his country's armies and magical tools.
* TheCaligula: His rigid self-righteousness and utter refusal to heed contrary opinions or even doubt anything he considers "fact" makes him entirely unsuited to rule, but he refuses to believe it. If the nation, starting with the capital, isn't willing to bolster his glory and be grateful for his non-existent "benevolence," then it can just burn to the ground with him.
* TheCoup: [[spoiler: When his plans blow up in his face, twice, and both the nobles of his faction, and the church who trained Nell turn, and start putting pressure on him, he sends covert ops troops everywhere to cause chaos as a distraction, so he can seize the crown for himself.]]
* TheDeterminator: Deconstructed. Once he sets upon a goal, he will not stop, regardless of the cost, setbacks, or counsel he gets against it. He fails to see how this can possibly be a demerit because once he sets down ''the wrong path'', he will utterly refuse to abandon it, no matter what happens to him, or those around him.
* GlorySeeker: All he cares about, aside from filling his coffers, is making a name for himself.
* HollywoodTactics: His tactics do have some merit, on paper. In reality... not so much.
* IRejectYourReality: He has deluded himself into thinking Supreme Dragon Leficious is a myth, and does not exist.
* IveComeTooFar: After the second time he tried, and failed, to invade Haunted Forest, against King's orders, he had to either take control of the country, or as Yuki put it...
--->"He'd be royally fucked without lube."
* NiceJobFixingItVillain: [[spoiler: By launching a coup against his own father, he gives Yuki the perfect vehicle, and cover, to infiltrate the capital to deal with him directly.]]
* PatrioticFervor: His FatalFlaw. He takes the love of his country (not exactly its people) to an extremely unhealthy degree, and if he had the ability, would go to all-out war over the tiniest of slights, real or imagined, upon the principles he thinks his country stands for. He constantly chafes against his father, the king, who is more cautious and pragmatic, and is most certainly opposed to stirring up the hornet's nest known as Haunted Forest.
* ReignOfTerror: What he launches while trying to take the throne.
* SuicidalOverconfidence: As officially noted in his character description, he's wholly convinced that the moment he takes control of any situation, things will go his way.
* SunkCostFallacy: His army gets torn apart going after Yuki, the Demon Lord? The army wasn't big enough, send a bigger one! Wait, can't do that right now? Let's send in TheHero, alone, with no plan, preparation, or back-up! If that fails, we'll send in the Orihalcum party of adventurers who are usually deployed only in cases of nation-level disasters!
* TautologicalTemplar: Since he believes his goal of expanding his country's borders and influence is inherently just, then anything he does in pursuit of that goal is itself inherently just. Even his father's royal decree(s) won't change his mind about this, at all.
* UnwittingPawn: Combined with PeoplePuppets and DeadAllAlong. [[spoiler: A demon took control of his corpse and instigated a civil war in the kingdom, for ends unknown.]]
* VillainHasAPoint: Although Yuki and Lefy were right to chase down the slavers that kidnapped Illuna, an armed invasion demands a response, or other nations will think that invading is the correct method of "diplomacy" to get what they want or need. Unfortunately, the response he chose is so ill considered that he's just making things worse, but he refuses to believe it.
* VillainWithGoodPublicity: As the crown prince, he has access to the nation's bully pulpit and can spin any and every story to his advantage, which he does unashamedly and unabashedly.
* WhatCouldPossiblyGoWrong: He not only launched the expedition against king's orders, he promised a great many profits to his aristocratic backers to get the army he used, without sending any scouts first. Then he sends TheHero there alone...
* WrongGenreSavvy: Since conquering the Haunted Forest is so difficult, there must be some great treasure there.
[[/folder]]
[[folder: Dorga]]
The leader of a six-man pack of thugs that foolishly "ambush" Yuki, Lefy, and Dell in a back alley... after tracking him from the Adventurer's guild and seeing him unload corpses of monsters for cash.
* AxeCrazy: Invoked and Literally. He is barely able to do anything but attack with wild abandon while he wields his cursed axe.
* AnAxeToGrind: He prefers war-axes as his WeaponOfChoice.
* EntertaininglyWrong: He not only thinks Yuki stole the monster corpses, that left the adventurer's guild in awe, from seasoned adventurers, but concludes that Lefy is a demon because a magical tool he carries says she's not actually human.
* GodzillaThreshold: When Yuki proves able to beat his men to a pulp without even trying, he whips out a cursed axe that he knows is going to literally drive him crazy, but doesn't think he has any other choice.
* {{Gonk}}: Yuki notes that he's unattractive, and the sheer mass of muscles he sports only makes it worse.
* InformedAttribute: One of his skills is "Crisis Detection Lvl III" yet he goes and provokes a Demon Lord and Supreme Dragon Lefy, even threatening the latter with gang-rape.
* MuggingTheMonster: Exactly like the muggers who attacked Chuck Norris thought his martial arts moves were fakes, this clown thinks Yuki's monster corpses weren't actually his kills, and went purely by body-type and appearance, so he stalks and attacks him in an alley.
* NiceJobFixingItVillain: His threat to gang-rape Lefy leads to Yuki calling her "his woman" in a fit of rage, which makes her realize how he feels about her, and how ''she'' feels about ''him''.
* SerialRapist: When Yuki uses "analyze" on him, he finds a title proclaiming that he's exactly that.
* TestosteronePoisoning: His entire frame had way too many muscles on it for his own good.
* TooDumbToLive: Even if Yuki ''had'' stolen those monster corpses, he had to be skilled enough to get close to the adventurers that killed the monsters, while the adventurers were actively doing the killing, and there's no way anyone like that would want the story getting out...
[[/folder]]
[[folder: Legillus]]
An orhicalcum class adventurer Prince Ryuit hires to guard the castle gates.
* BeatStillMyHeart: Yuki has to literally rip his heart out to stop him.
* BloodKnight: He seeks out battles to the death, caring not a bit for context or situation.
* InterplayOfSexAndViolence: He gets sexual arousal from battles to the death, and orgasmic glee, win or lose.
* MajorInjuryUnderreaction: Combined with MadeOfIron. A blow that takes out a major portion of his chest and abdomen isn't enough to stop him, or even slow him down.
* RedBaron: "The War Freak."
* UltimateJobSecurity: His obsession with battles to the death, being a living ball of chaos, indiscriminate threat to friend and foe, makes everyone avoid him at all costs whenever possible, but his strength as an orihalcum level adventurer makes it impossible for the Adventurer's Guild to fire, or imprison him, as he would deserve in any other setting. The Adventurer's Guild, as a whole, can't control him in any way.
[[/folder]]
[[folder:Gilordio Gyogarr]]
A black dragon "acquaintance" of Leficious.
* AmbitionIsEvil: Wants to take over the world, exterminating all the other races in the process. Even at her most unsympathetic, Lefi wouldn't flatten countries without cause.
* AndNowYouMustMarryMe: To Lefi. He ''orders'' her to marry him, after he somehow usurped the throne of the Dragon king from his predecessor. This ticks Yuki off so much that Yuki has to kill the guy, personally.
* CompeteForTheMaidensHand: What his fight with Yuki was all about. What he didn't realize was that even if he had won, Lefi wouldn't have married him anyway, seeing as she only saw him as a petulant child too big for his britches.
* DarkIsEvil: He's a black dragon, and is an arrogant, cocky, detestable sot.
* HoistByHisOwnPetard: Gets his BreathWeapon turned against him, ''twice.''
* HumansAreInsects: He insists on calling Yuki, the demon lord, an insect, and is insulted upon seeing Lefi with a humanoid form.
* {{Hypocrite}}: "Stop using cheap tricks" says the guy who clearly won the seat of "Dragon King" by underhanded tricks.
* JustToyingWithThem: Which comes back to bite him when Yuki pulls out the stops and starts using dungeon traps to mess him up, good.
%%* OffWithHisHead: How he dies.
* SuicidalOverconfidence: He flies up to Yuki's dungeon, lands, and demands Leficious, the supreme dragon, marry him.
* VillainousBreakdown: When he thinks he's killed Yuki, only to see the latter stand up again, barely holding it together, he panics and completely loses it.
* VirtueIsWeakness: He proclaims all the elder dragons as "senile" because they weren't keen on exterminating all the other races of the world.
* WeCanRuleTogether: He promises Lefi rulership of the world if she marries him. She refuses outright.
[[/folder]]
[[folder: Lord Gojim]]
Leader of the "True Blood Fiends" factions of the Demons.
* AmbitionIsEvil: Wants to lay claim to the demon throne, and use it to launch a war of conquest on all the other races of the world, regardless of the means, fair or foul, though mostly foul.
* AuthorityInNameOnly: He is a figurehead for the "fiends", and he knows it. In fact, he happily lets them do whatever they want most of the time, as he's well aware that he has no leadership skills.
* AwakeningTheSleepingGiant: He and his "Fiend" faction attack the Winged Demon Clan in the middle of the night, even targeting women and helpless children, because they couldn't ignore a power bloc of that magnitude and failed to sway them to their side. Rather than eliminating this "unstable variable" and supplanting them with loyal puppets like they intended, encountering the hero Nell, who proved way stronger, determined, and righteous than they could have imagined, has convinced the Winged Demons to take up arms against the Fiends, on the side of King Phryne, and Yuki's appearance to rescue Nell also completely annihilated a significant part of their faction. Even so, Gojim is unswayed, confident his plans have already reached a point where nobody can stop him anymore.
* BelievingTheirOwnLies: He genuinely believes he's honorable, brave, and has the moral high ground against King Phryne and the peaceful faction of the Demon Kingdom. While he's no pushover and is armed with a cursed blade at least as powerful as Zaien, he's an honorless coward who only fights people weaker than himself, whenever he has a choice, and happily sends troops against women and children if their faction doesn't agree with him.
* DramaticIrony: His followers bring forward perfectly sound reasons to believe that Yuki is the least likely, among a list of four suspects, to be the masked man that is largely responsible for rescuing Nell and scuppering most of his plans, as well as absolutely decimating his army. The most compelling of which are the fact that Yuki's dungeon is over a week away, by the fastest possible transport, and is situated in a very dangerous area, presumably under constant threat. It just so happens that Yuki is indeed the masked "mercenary" who did so, and did it not for money or fame, but because he's got a serious personal grudge. Not to mention that the biggest threat to Yuki's dungeon, the Supreme Dragon Leficious, ''happens to be Yuki's wife!''
* EvilRedHead: Red hair and a particularly nasty sot who sends assassins by the army-load against his political enemies or their supporters.
* MortonsFork: Invoked. When Yuki makes an official challenge against him, personally, by throwing a sword dropped by his last arena opponent at his head, he's got only two options, go down to the arena and fight, or risk having his entire faction see him as the craven coward he actually is, in public, causing the "honor" of his so-called cause to be questioned, and risking his faction's collapse, not to mention a public airing of his dirty laundry. He chooses to go fight, openly throwing off his retainers when they try to stop him.
* NonchalantDodge: Dodges a sword that Yuki throws at him, and the chair he's sitting in, just by moving his head slightly to the side, not even breaking his posture.
* SlaveToPR: His entire "campaign" is built upon the illusion that his faction is genuinely stronger than the demon king's, through actual might, not subterfuge, cowardice, and wanton slaughter of the helpless, including women and children. As such, he ''openly throws off'' his supporters when Yuki openly challenges him to a duel, despite being well aware that Yuki is very, very dangerous, because he doesn't dare appear weak or cowardly in public.
* SunkCostFallacy: Up to eleven. He and his faction suffered major losses to Yuki, Nell, and King Phryne's elite counter-insurgent forces, and rather than admit they might, just might, have an untenable position, in both assets and ideology, their morale ''is actually invigorated'' because they see themselves avenging their fallen and continuing on down their path of conquest as the height of noble acts, and turning away from their warmongering as an insult to their deaths, making their "sacrifices" meaningless.
* {{Warhawk}}: Openly cries for total war against the humans, beastmen, and other races of the world, to prove the demon's dominance, and superiority. He sees all demons that refuse to join his banner, whether they actively oppose him or not, as traitors that don't deserve to live.
[[/folder]]
[[folder: Baron Argus]]
One of the most glaring self-important nobles who think King Reid is a senile old coot that's been on the throne too long and needs to be replaced, as well as removing Nell from the "Hero" spot and replacing her with a new "hero" easier to manipulate.
* AmbitionIsEvil: All his villainy was spurred by the thought of being as close to the throne as possible without actually becoming the next king.
%%* AristocratsAreEvil: A noble and a total asshat.
* EngineeredHeroics: The cornerstone of his plans was discrediting Nell by engineering crises and then swooping in to "solve" them. He does this, twice. Once by having an agent provoke a swarm of monsters and then have said monsters descend upon a town where Nell had to cross to reach the capital and then blame Nell for the resulting casualties. Not only did Nell (and Yuki) completely curbstomp the massive monster army, but they exposed the agent. Said agent wound up left to the the mercy of the monster survivors. Then again, in the royal capital, he has his men instigate a riot while Nell and Yuuki were in a ball with the king, swooping in at the last possible moment, trying to discredit Nell by showing that even though she was present, she didn't do squat. Yuki, having several recording devices in his mansion not only scuppered his plans, but brought hard evidence against him forward to the ball, and exposed his crimes to all the other nobility, including the king.
* NeverMyFault: When evidence of his crimes is brought before him, he tries to weasel out with all sorts of excuses, and even asks Jaynor for help, teary eyed, saying he's done nothing wrong. Jaynor drops him like a hot potato in return.
* SmugSnake: He thinks and acts like he's the smartest man in the room. He's not.
* UnwittingPawn: To Defense Minister Jaynor. Jaynor let him think he was a subordinate, but never actually had his back.
[[/folder]]
[[folder: Defense Minister Jaynor Redrius]]
The mastermind behind the "Depose Nell" plan launched by Argus.
%%* TheChessmaster: He's always got plots within plots going.
* DoNotTauntCthulhu: He boasts of Nell being a useful tool to Yuki, right in the latter's face. When Yuki grabs his throat and threatens to pop his head off like a Pez dispenser, he quickly realizes what a bad idea that was and apologizes while he can still (barely) speak.
* KarmaHoudini: Since there's no direct evidence of his collusion, he's not going to face any punishment, and he knows it, so he doesn't see an issue with rubbing Yuki's face in it.
* ManipulativeBastard: He had Nell, Yuki, Argus, even the king within the palm of his hands, and still does.
* AMillionIsAStatistic: He was perfectly willing to sacrifice an entire city for the sake of his plans.
--> "It is better to lose a city than a war."
* MoralSociopathy: He truly is working in the best interests of his country, as he sees them, anyway, and only sees people as tools to that end. When he called Nell a tool, he realizes it's Yuki's BerserkButton.
* PlausibleDeniability: He had Argus strung along so well that the latter never realized that all the dirty work had his signature on it, leaving no evidence of Jaynor's involvement, until it was too late.
* RealPolitik: All that matters to him is that his nation prospers. The means are of little relevance.
* XanatosGambit: No matter how the incident turned out, his goals would have been met. Nell gets disgraced and replaced by another "hero"? Well, her relationship with Yuki wouldn't give the surrounding countries Casus Belli to attack because she'd already been disgraced and cast out. Nell and Yuki win the day and expose Argus's schemes? A bunch of corrupt nobles and other bad actors get purged. Nell and Yuki get married, while Nell's still the "hero"? The kingdom just got a powerful new ally since Yuki's not going to let anyone mess with his lover!
[[/folder]]
! Others
[[folder:Raylow Lurubia]]
The mayor of the town of Alyfro.
* IgnoredExpert: He is denied an audience with King Reiyd Glorrio Allysia outright, after Yuki and Leficious chase down the slaver gang that abducted Illuna, and the rest of the government in the kingdom of Allysia outright ignore his first hand account concerning his experience, despite the fact that his town is right smack on the front lines. [[TheSoCalledCoward Then they have the gall to be shocked that he provides them absolutely zero support on their ventures that would easily destroy their country.]]
* KnowWhenToFoldEm: When a Demon Lord, Supreme Dragon, and a wing of 100 dragons descend upon your town, you had best bow and scrape right away, and hope you can bow and scrape enough to keep from getting blasted to oblivion.
* MyCountryRightOrWrong: Even though he knows his country's government is entirely in the wrong by repeatedly antagonizing Yuki with armed invasions into Haunted Forest, he won't give up secret information, even if his town would be spared in exchange. Yuki is duly impressed by that level of devotion, especially to a country government that almost clearly does not deserve it.
* NervousWreck: Invoked and Justified. When your town is on the border of a monster-filled forest, the two leaders of said forest can show up at any time, with an army of 100 dragons, and your government just keeps on poking that hornet's nest, just to see what happens, despite your objections, it's certainly going to fray your nerves quite a bit.
* PleaseKillMeIfItSatisfiesYou: When he sees Yuki and Lefy in his office ''a second time'', he fully expected they were there to deliver DisproportionateRetribution for the repeated armed invasions into Haunted Forest, and offered up his own life if they would promise to leave his town alone. He was gobsmacked when Yuki simply wanted to peacefully redress his grievance by being told who the actual perpetrator is.
* TallPoppySyndrome: On the receiving end. He's well aware that most, if not all, of the other nobles of his country ''loathe'' him because he earned his noble title, by merit, not bloodline, and see him as an upstart, his city has the strongest adventurers and soldiers in the country because they are at the boundary of Haunted Forest, his city is prosperous, despite the constant threat of monster invasions, and the icing on the cake? His troops pulled back when Yuki gave fair warning, thus surviving, while the rest of the nobles' forces foolishly continued to pursue their aggression and were utterly annihilated.
* WhatWereYouThinking: When he hears from Nell, the hero herself, how she was sent to subdue Yuki, alone, and was surprised that not only did he spare her, but revealed that the situation clearly does not match what she was told in her briefing, Mayor Raylow blew his stack, and lampshades the trope by name, screaming at his government's arrogance, idiocy, and incompetence, while pounding on his furniture.
* WrongGenreSavvy: He fully expected Yuki and Lefy to go full-tilt OmnicidalManiac after being antagonized by his country's repeated armed invasions. He's wide-eyed with shock when Yuki comes to him seeking peaceful redress, and the identity of the actual guilty party or parties.
[[/folder]]
[[folder: King Reiyd Glorrio Allysia]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/reid_9.jpg]]
[[caption-width-right:350:Don't touch Haunted Forest!]]The reigning monarch in the kingdom of Allysia.
* ForcedToWatch: In the castle's dungeons, he's chained to a wall in a cell across from where his daughter, also in chains, was getting brutalized by one of Prince Ryuit's thugs' for ''sexual arousal.'' Fortunately for the king and the little girl, Yuki came along [[BerserkButton and saw it.]]
* TheGoodKing: He may not be a powerful general, or fight on the front lines, but his economic and diplomatic efforts provide a very high standard of living for his subjects. In fact, the kingdom of Allysia is the most prosperous country in the world, precisely because of him.
* ItsAllMyFault: Blames himself, entirely, for his eldest son's fate.
* ReasonableAuthorityFigure: He, wisely, was willing to overlook the invasion and temporary occupation of Alyford because the targets were all members of a criminal organization, and unlike his son, knew full well that said organization were the actual aggressors. Not to mention, he knows full well that antagonizing Haunted Forest will ''easily'' bring the doom of his nation.
* TheSoCalledCoward: Though his son never says it to his face, for fear of the due repercussions, he thinks the king is a coward for not immediately mobilizing troops to the Haunted forest in retaliation towards Yuki's and Lefy's attack.
* ThreatBackfire: When Yuki makes crystal clear that should the king go after Haunted Forest, for any reason, Yuki would kill him, leaving his daughter an orphan crying over his grave, the king smiles and retorts that traditionally, the threat would have been made against his daughter instead. This leaves Yuki so stunned, he states that his facial expression would likely be that [[ShoutOut of a shocked Pikachu.]]
* UncertainDoom: He's officially gone missing. Nobody currently knows if he's alive or dead. [[spoiler: He's later found imprisoned in the castle dungeons.]]
[[/folder]]
[[folder: Gamdia Roston]]
Former commander of the Knight order, and the only commanding officer to survive the ill-conceived attack on Haunted Forest.
* CassandraTruth: He went to warn his superiors about how badly they were outmatched. He was ignored.
* KnowWhenToFoldEm: When the Demon Lord seemingly teleports into your tent in the middle of the night, and says you'd be insects before his wrath, letting you depart only because it would be too bothersome to kill you, getting the hell out of Dodge is the right idea.
* ScrewThisImOuttaHere: He took his squad and retreated when given the chance. Said squad were the only survivors.
* TheSoCalledCoward: Because he wisely withdrew from a battle he had absolutely no chance of winning when given the chance, his superiors in the chain of command, especially the crown prince, dubbed him a coward and stripped his command. He and his squad consider this a small price for getting out of hell alive.
[[/folder]]
[[folder: Carlotta]]
The head of the church, and the one who trained Nell to be humanity's "Hero."
* AsskickingEqualsAuthority: Strongest member of the church, even beating Nell, and its leader.
* AwesomeByAnalysis: While she never manages to penetrate Yuki's "Disguise" spell completely, failing to recognize him as the Demon Lord, simply from examining his footprints, she's well aware that he's hiding his true strength, [[IJustWantToBeFree because he values his freedom.]]
%%* BeautyEqualsGoodness: Physically attractive and morally upright.
* TheChessmaster: While she is very benevolent, she does always have plans within plans going. This terrifies Yuki.
* EntertaininglyWrong: Her assessment of Yuki and his motives is only right in one area, his character. In everything else, she's only marginally correct.
* FriendToAllChildren: She runs an orphanage, in addition to her duties for the church. The kids all love her.
%%* HighPriest: Leads the church and is its strongest paladin.
* IfOnlyYouKnew: She constantly sings Yuki's praises and would love to recruit him to the church, to aid against enemies foreign and domestic, especially the Demon Lord, but she's not aware that he's the very demon lord she wants to fight against.
* LaResistance: She and the church are not keen on living under the rule of Prince Ryuit, and with good reason.
%%* MagicKnight: Powerful knight, and priest.
%%* AMotherToHerMen: Treasures her subordinates dearly.
%%* RousingSpeech: She goes into one, in detail, as she prepares to deal with the EvilPrince.
* ScarpiaUltimatum: On the receiving end. A group of corrupt knights attempt to forcefully confiscate food from her orphanage and the starving children therein. Said knights "offer" to let the children eat unmolested, for the most part, if she allows herself to be passed around and "sampled" instead, with a sick, perverted laugh. Neither she nor her allies are amused. When she refuses, said knights then proceed to go after the children with swords...
[[/folder]]
[[folder: Princess Iryll]]
The young daughter of King Reyid
%%* CheerfulChild: Very sweet and happy child.
%%* ChildrenAreInnocent: A very sweet and adorable child.
* FreakyIsCool: She adores Yuki's Demon Lord traits, including his wings.
* HateAtFirstSight: She and Illuna immediately and instinctively realized that they're always going to be at odds, and within minutes sized each other up and quickly proceeded to yank each other's cheeks until they were both badly bruised, and for no rational reason.
* PrecociousCrush: As a direct result of unintended RescueRomance. Because Yuki rescued her from the deprivations of her elder brother and his gang of thugs, she's gone and written him a love letter, which Nell delivers into his hands in chapter 152. Yuki is rightly concerned on how he's possibly going to answer such a letter.
* ThreatBackfire: When she gets on Yuki's nerves by calling him a hero, he looks to intimidate her by revealing he's the Demon Lord. She responds with glee and amazement, to his confusion.
[[/folder]]
----
Beware unmarked spoilers.
[[foldercontrol]]
! Protagonist
[[folder: Yuki]]
--> Race: Arch Demon [[spoiler: Demon Lord]]
----
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/41830074_2175871609320624_379480869070438400_n.jpg]]
[[caption-width-right:320:Bow before the great demon lord!]] Originally a human from Earth, but reincarnated as a Demon Lord and bound to a dungeon.
* AccidentalMarriage: To Illuna. He was unaware that letting her drink his blood is a sacred marriage covenant among the vampire race, until Leficious spells it out for him much later. Illuna, who asked permission, did know, but refused to enlighten him...
* AccidentalPervert: Teleporting home from the Demon Kingdom, he comes face to face with Nell, topless, because she's changing in his throne room, ''a public place.'' Awkward doesn't even begin to cover the aftermath.
* AchievementsInIgnorance: Most of his accomplishments are a direct result of a lucky (or unlucky) accident.
* AnythingButThat: He is terrified of swarms of large bugs, and it's justified. Although he can easily beat any of the bugs of Haunted Forest in a one on one fight, or even when considerably outnumbered, these bugs terrify him because of their single-minded dedication to eliminate him on each and every encounter, and just keep coming until either something else catches their attention, or their entire nest is destroyed, caring not a whit about how many of their kin they have to sacrifice in the process.
* AwesomeByAnalysis: Played with. While he does occasionally have keen insight regarding his abilities and environment, his successes and failures are either due to having things explained to him or the result of pure accident. The best straight example is during his first encounter with Leficious, where he could smell honey on her breath, so he inferred that she had a powerful sweet tooth and he could use chocolate to persuade her not to attack him for trespassing in her territory.
* BadassPacifist: He prefers the peaceful solution whenever possible, as he hates gore and bloodshed. Provoke him, and consider yourself lucky if there's enough left of you to bury.
* BathtubBonding: When he fashions a spa, both Illuna and Leficious barge in on him and join him in its use.
* BerserkButton: Even if he's well aware that she can defend herself just fine, so much as the threat of harm to one of the ladies in his sphere of influence will make him flip his shit. This goes doubly so for Illuna. The last time some yahoos threatened her, he was only stopped from utterly annihilating the city where it occurred by Leficious pinning him to the ground and making him stop with a CooldownHug.
** If you're a pervert who gets off on brutalizing little kids, keep it to yourself when he's around, because if he catches you in the act, he will see red and kill you.
* BigBrotherInstinct: Mess with Illuna, and your life is forfeit.
* BodyguardingABadass: Though no slouch himself, anybody who threatens Lefi will get him angry enough to go totally postal on the threat.
* BornUnlucky: At level 1, all of his stats are 500+ except his luck, which is ''70''. Everybody else has better luck than that, including a slime he summons.
* BullyingADragon: It doesn't take long, after Leficious moves into his home, that he starts treating her like a BrattyHalfPint. She lets him do it because she finds it amusing.
* CombatPragmatist: It doesn't happen often, but when he faces someone stronger, more skilled, or both, he won't hesitate to fight dirty.
* ContagiousHeroism: Though he adamantly insists that he's not a "hero" and doesn't want to be known as one, his heroic virtues will rub off on you if you're around him long enough.
* DarkIsNotEvil: He's a Demon Lord, loves to decorate everything from his weapons and clothes to his buildings in dark, especially jet-black colors, and is an inherently good and noble individual.
* DeliberateInjuryGambit: In chapter 102, he takes a sword strike to his arm to avoid one to his head. While the sword is stuck, he uses his other arm to deal a fatal blow.
* DramaticIrony: Nell, the human "Hero", trained from a very young age to fight Demon Lords, sees Yuki, ''The Demon Lord'', as the perfect template upon which to model her idea of heroics. Many people lampshade this, though Yuki himself remains unaware.
* FantasticArousal: He learns that his demon's wings are erogenous zones when Leficious starts to rub them...
* FishOutOfWater: It takes him a great deal of time and effort to learn how to live in this new world.
* FlatEarthAtheist: Played with. While he was an Atheist on Earth, as he mentions in chapter 93, the moment he sets foot in a church "safe house" where the goddess is worshiped, and feels all the holy magic involved in the murals, he not only looks on in awe, but is quite willing to accept that said goddess might actually exist.
* FriendToAllChildren: As is revealed in chapters 94 and 95, while visiting an orphanage run by the same church that raised Nell, the children absolutely adore him, especially when he roleplays [[IfOnlyYouKnew "The Demon Lord"]]. The fact that he shared the meat of monsters he hunted earlier for them during a famine ''deliberately instigated by Prince Ryuit'' in his bid for power didn't hurt.
* GenreSavvy: To the point of LeaningOnTheFourthWall. He was an avid troper in his life on Earth, and speaks of tropes all the time concerning his situation, to the confusion of those around him.
* GoodCannotComprehendEvil: Downplayed. He can understand that criminals are scum. He can comprehend why knights under Prince Ryuit would try to provoke the church so he can publicly brand them rebels and hunt them down, but when said "knights" draw a sword and attempt to strike down a hungry orphan child for the "crime" of accidentally bumping into them with the very stew they're trying to confiscate, Yuki is offended into attacking.
* GoodFeelsGood: He does heroic things because he enjoys it.
* GoodIsNotNice: He's actually not that bad by western standards. But the standards of Japan, where the story is written, he's supposed to be extremely rude, crude, vulgar, and "an internet pedophile," even if he is actually quite decent and kind in person.
* GoodIsNotSoft: If he's given just cause to anger and violence, he will respond with maximum force and brutality, and he won't stop until the target(s) of his rage are LudicrousGibs, if they're lucky.
* HairTriggerTemper: Subtle, but present. Yuki is usually really fun to be around, but he has a very low "asshole threshold." While he will sincerely strive to get along with others, if you're the kind of dork who likes to go around looking for trouble, throw your weight around, give people grief to amuse yourself, or refuse to be "satisfied" unless you have responded to any offense against you, real, imagined, or entirely accidental, with violence, he will ''completely'' flip his shit, even if he's the one at fault, and do whatever it takes to beat you down.
* HeroWithBadPublicity: As a Demon Lord, he certainly inherited a bad reputation, but he is a good and noble character, and if you don't intentionally antagonize him, you've got nothing to worry about.
* HotBlooded: He throws his entire passion into everything he does, to wild and unpredictable effect.
* HumansAreInsects: When he's asked why he was giving an invading human army fair warning instead of simply slaughtering them, he equated the humans to insects. In truth, he thinks the invading human army was ''weaker'' than insects, and when comparing to the insects in Haunted Forest, he's right.
* IdealHero: Though he would adamantly insist otherwise, he is this. He acts in a heroic manner, purely for its own sake, not because he's expecting a reward, although he certainly wouldn't turn a reward down, and does act heroically because he enjoys doing so, or benefits from it.
* IgnorantOfHisOwnIgnorance: From the other end. Not only is he so powerful that he has problems relating to the "common sense" of this new world, but for most of volume 1, his entire basis for comparison is the one being even stronger than himself, the Supreme Dragon Leficious.
* ImNotAHeroIm: He '''hates''' "heroes", especially those who boast of their selflessness, and pointedly does not want to be one.
* IWarnedYou: When a hodge-podge army of mercenaries and various "noble" houses intrudes in his territory, seeking to "avenge their country's honor" as a direct result of him hunting down a slaver cartel, to rescue Illuna, while said cartel was operating (illegally) in their country, he goes to what he thinks is the top commander and warns him. Said commander warned his superiors, but was ignored. The warned commander wisely withdrew his squad. That squad survived. The rest? They got to help Yuki [[CruelAndUnusualDeath test out his new dungeon traps]].
* KirkSummation: To Nell, an official "Hero" of the human kingdom. With just a couple of well phrased sentences, he made her realize her actions were hardly heroic, and she was just an UnwittingPawn. She gets better.
%%* LikeAnOldMarriedCouple: With Leficious. The two of them act like they've been married for years.
* MagicEye: As a result of being a demon lord, he has a red eye that allows him to check the Dungeon "menu" at any time. He can also see the flow of magic, letting him predict an enemy's spells before they even finish casting.
* {{Manchild}}: He may ''look'' like a full-grown adult, but he has a very childish temperament. This is the aspect of his character Lefi loves and is annoyed by the most. It's also what makes him beloved by children as he can relate to them.
* MistakenForPedophile: All the time. Leficious ''only looks'' like a pre-teen, but is ReallySevenHundredYearsOld, and due to a cultural misunderstanding he's accidentally married to Illuna who actually is a pre-teen.
* MoralityChain: His very existence is the primary reason Leficious isn't currently going on rampages to slake her boredom.
* MundaneUtility: Remember that majestic castle? In times of peace, it's a massive theme park where the kids living in his dungeon can laugh and play, without a care in the world.
* TheNicknamer: He's fond of giving people amusing little nicknames in his head. He's not above making profane and vulgar nick-names for people he does not like. A certain black dragon gets the dubious honor of "Douche-lord."
* OneManArmy: Thinking he's entirely reliant on his dungeon to deal with armies is a suicidal mistake. A group of mass-murdering fiends that were attacking the winged demon clan, including the women and helpless children, and threatened Nell with rape, dismemberment, and death, ran across him. The moment Nell's unconscious form was sent off to safety... the aftermath was so horrific, the survivors slit their own throats in abject despair, save one, the leader, who wound up [[JackBauerInterrogationTechnique questioned by Yuki.]]
* RightForTheWrongReasons: After he's spent ''days'' designing the perfect castle, purely to awe the world with his magnificence as a Demon Lord, and then invested a massive amount of DP to actually build it, it proves way too large and unwieldy to actually live in. In any other time and place, this would have been a monumental boondoggle. In this story? It proves the ''perfect'' decoy, because armies, enemy scouts, and adventurers would presume that the Demon Lord, and his treasures, would be inside. As showcased when Nell invades the dungeon...
* RoaringRampageOfRescue: When he chases down Illuna's scent, tracking her back to the slaver cartel who kidnapped her, said cartel foolishly attacked him. Say hello to a pile of corpses and entrails splashed on the walls.
* RuleOfCool: In universe. He does strange (and often impractical) things because he's fascinated with projecting a "cool" image of himself.
* SecretlySelfish: Although he would adamantly insist otherwise, he is heroic in word, act, and mindset, but he internally admits that he does heroic things purely because he either benefits from doing so or actively enjoys it. This does not stop him from being an IdealHero.
* ShowyInvincibleHero: Invoked. Not only is it extremely gratifying to watch him obliterate armies of enemies like they're nothing, he goes out of his way to make sure this is the case.
* SuddenGameInterface: Discussed, Invoked, and Lampshaded. When he touches the dungeon-core, it scans his mind and tools a "menu" interface styled off the RPG games he's familiar with. He's then forced to see the world that way, especially when he uses the newly acquired "analysis" skill.
* TastesLikeFriendship: He "tames" Leficious, the Supreme Dragon, by offering her chocolate and other sweets that wouldn't otherwise be obtainable in this world.
* TheUnfettered: He lives by his own rules, on his own schedule, and only does things, or listens to people, that he wants to.
* UnskilledButStrong: Being a demon-lord, he can, and does, overpower most of his foes with sheer brute force. He's trying to become StrongAndSkilled so that he doesn't get overwhelmed by those who can gobsmack him with pure skill.
* UnstoppableRage: Yuki is usually pretty chill. When he gets pissed, he gets ''pissed'', and he won't stop until he's physically restrained, or his targets are dead.
* WhatsUpKingDude: Yuki cares not a whit about official titles or ranks. His opening greeting to the king of Alyssa is the trope, by name. The fact that he's a friendly Demon Lord, and there are few who could fight him on equal footing, and fewer still who would want to, helps him get away with it.
* WeirdnessMagnet: There is never a dull moment around him. Not only because he's prone to getting into fights, but because he as almost no concept of the local "common sense." The ladies in his life ''actually appreciate this'' as much as it also annoys them.
* WildCard: Despite being an IdealHero, he's not going to intervene in affairs that don't directly impact him. For example, the ongoing human/beast-kin war. Either army tries to pass through his territory? The other side just won itself a powerful ally.
* WouldNotHitAGirl: Slapstick on Leficious aside, he prefers to avoid hurting women, but if she's a serious threat and refuses to stand down... so be it.
* WouldNotHurtAChild: While it has yet to crop up much, seeing how remote his dungeon is, he does not like hurting children, and if he finds those who do, he tends to be quite... upset.
* YouAreWhatYouHate: He loathes heroes to the point of revulsion, seeing himself as a VillainProtagonist. Paradoxically, this is the trait that keeps him as an IdealHero... Which his internal dialog states is the kind that disgusts him most.
[[/folder]]
! Supporting Characters/Active Allies
[[folder: Leficious/Lefy]]
--> Race: Dragon.
----
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/32768020_2077149305859522_4346084446273798144_n.jpg]]
[[caption-width-right:320:Thou hast best appreciate mine, The Supreme Dragon's, benevolence, Demon Lord.]]The very first being Yuki meets in the new world.
* BecauseYouWereNiceToMe: The reason she dotes on Yuki and lets him smack her upside the head when she throws tantrums? He treats her like an equal and genuinely praises her honestly.
* BigEater: If left to her own devices, she would eat a week's worth of food for two people in a single sitting. And that's after transforming into her small humanoid body...
* BrattyHalfPint: She may be a millennia-old dragon, but she behaves like a spoiled middle-schooler, apparently because she [[LonelyAtTheTop didn't socialize much]] before meeting Yuki.
* DisproportionateRetribution: Annoy her, and a wing of 100 dragons will descend on your city, if she's feeling generous...
* FantasticArousal: Her dragon wings are every bit the erogenous zone that Yuki's demon wings are, as she discovers when Yuki starts fondling hers as she's fondling his...
* FriendlyAddressPrivileges: She allows those close to her, like Yuki, to call her Lefy.
* GodzillaThreshold: While she could ''easily'' devastate the royal capital, especially TheEvilPrince who keeps harassing and threatening him, Yuki is loathe to ask her to do it, because she's so powerful [[PowerIncontinence she lacks the fine control to keep from leveling the country in its entirety, by accident.]]
%%* HappilyMarried: Starting in chapter 133.
* HiddenDepths: While she may seem all but worthless as a Dungeon resident, outside her unwitting DP contribution, truth be told, she's an excellent mother and mentor, as Illuna and Yuki will happily testify, respectively.
* ItAmusedMe: The reason she goes on rampages, stomping demon lords, dungeons, and human cities flat? She's bored and wants amusement.
* LazyBum: Unless she's being actively entertained, she prefers to just loaf around.
* LethalChef: Justified. It's not a lack of knowledge or talent that's keeping her from being able to cook. Nor is it a lack of effort. It's PowerIncontinence. She has so much raw strength, even in her humanoid form, that she simply can't exert the proper fine muscle control to combine ingredients properly, nor even use a cooking instrument. She spent an entire night trying, and failing, to cook anything presentable, and ultimately wound up with "cookies" that looked and tasted awful. Yuki still accepted and ate them, with gratitude, [[SickeningSweethearts just to show he cares.]]
* LittleBitBeastly: If not for her horns and tail, she could easily pass for a human girl. She can actually hide those parts if she wants to visit a human city, but it doesn't feel right to her.
* NakedFirstImpression: She starts the story nude. As a dragon, this isn't an issue for Yuki. When she adopts a pre-teen human form...
* PersonOfMassDestruction: Even in her humanoid form, she can level countries, and ''easily'' smack down Yuki if she ever feels the need for violence.
* PhlebotinumBattery: The only reason she avoids PrettyFreeloader status is that her very existence in Yuki's dungeon provides a large amount of DP (dungeon points) that he can basically use like currency to create food, items, monsters, etc. She does, however, slowly begin to help out with chores as the story progresses. And later in the story, she isn't a PhlebotinumBattery anymore because she officially became part of Yuki's family through marriage.
* PowerIncontinence: Her power level is so great, that when she aids Nell to deal with a ZombieApocalypse, her ''weakest'' spells destroyed two houses, one by fire, and the other by flood.
* PropertyOfLove: While she hates Yuki's "Tamer of the Supreme Dragon" title, she openly admits in chapter 65 of the light novel that she loves it when he called her "his woman," in chapter 64 of the light novel after a gang of thugs proclaimed their intent to gang-rape and murder her, and stated that the law would do nothing about it because she's [[WhatMeasureIsANonHuman not human]]...
* RelationshipUpgrade: In chapter 133, she marries Yuki with a SacredFirstKiss. The squeeing was so loud, the fourth wall broke from ''both'' sides! Another relationship upgrade happens when it was confirmed in chapter 402 that she is pregnant with Yuki's child.
* ShamelessFanserviceGirl: She openly flaunts her naked body in front of Yuki, and when he loans her his shirt to cover herself, she teases him about "attacking her because of her beauty." She also sees nothing wrong with barging in on him when he's bathing.
* ShanaClone: Aside from lacking ACupAngst, she's this. And it's justified in that she's a Supreme Dragon and could easily depopulate the entire world if she wanted to.
%%* SickeningSweethearts: With Yuki.
* SoreLoser: If she's beaten in a contest, game, or anything, she will force rematches until she's either victorious or collapses from exhaustion, whichever comes first.
* SweetTooth: Her FatalFlaw. The fact that Yuki feeds her common Earth sweets, which she can't get anywhere else, is the primary reason she decided to be submissive to him.
* TopWife: In chapter 181, she informs Yuki of two very important facts. 1.) Polygamy is the law of the land in this new world. 2.) '''She''' will decide who else Yuki's going to marry, and lay down the ground rules, and infidelity will not go unpunished. Since she's the Supreme Dragon, Yuki can only meekly nod his head, covered in nervous sweat.
* VoluntaryShapeshifting: She can assume either her dragon or humanoid form at will. She chooses to remain humanoid for convenience in Yuki's dungeon, but she can make herself look fully human if she wants to visit a human city.
* YeOldeButcheredEnglish: How she speaks to display her "superiority" to others. It fades as she grows more and more comfortable in Yuki's home.
[[/folder]]
[[folder: Shii]]
-->Race: Slime
----
The first monster Yuki summoned.
* GoodThingYouCanHeal: Upon being summoned, she lunged at a level 21 cerberus, and got swatted into a wall. She was perfectly fine a few minutes later, but Yuki decided to keep her out of trouble after that.
* LikeBrotherAndSister: Once able to take on Illuna's appearance, the two laugh and play as if they're twin sisters who have lived together all their lives, and it's absolutely adorable.
* NoBiologicalSex: Slimes don't have genders, but she identifies as female because she's copying Illuna, aside from being blue and translucent.
* TheSilentBob: Yuki can somehow understand her perfectly, despite the fact that she has no speaking lines, at all.
* SuddenlyVoiced: Yuki comes home from a multiple-day "date" with Lefi in the nearby town to find she's taken on Illuna's appearance, aside from being blue and translucent, and able to speak fluently.
* TeamPet: Her primary role in the story.
* VoluntaryShapeshifting: Through means not fully understood, she learns to take on Illuna's form, aside from being blue and translucent.
[[/folder]]
[[folder: Illuna]]
-->Race: Vampire
----
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/32764899_2077148995859553_4715679421615308800_n.jpg]]
[[caption-width-right:320:Illuna is currently riding Mofir, with the slime Shii sitting on the fenrir's head.]] Yuki's child "bride."
* AccidentalMarriage: Averted. She certainly knew that asking for Yuki's blood was a marriage ritual, but never told him.
* BeCarefulWhatYouWishFor: She pleads with Yuki to free some fellow slaves from the slaver cartel that kidnapped her. Two of those female slaves wind up moving in...
* BreakTheCutie: A human slaver ring tried, repeatedly. [[TooDumbToLive They annoyed both Yuki and Lefy in the process.]]
* CheerfulChild: When treated kindly, she's a very sweet and upbeat child.
* ChildrenAreInnocent: While she does know that drinking someone's blood is a sacred marriage ritual, she doesn't comprehend what marriage is, and is in all other respects a sweet and innocent child without a trace of malice in her entire body.
* TheCutie: She's adorable on both sides of the fourth wall.
* DeceasedParentsAreTheBest: Her parents died fighting, in order to give her a chance to escape genocidal humans looking to kill or enslave her entire village.
* DoomedHomeTown: She is the LastOfHerKind as her home village was wiped out by humans.
* FantasticRacism: Defied. She ''should'' hate all humans without exception, but she doesn't. She even goes and mingles with a human "hero" and turns on Yuki for "bullying" her, after she tried to break into his home to kill him.
* HairOfGoldHeartOfGold: Blonde, and sweet all over.
* HappilyAdopted: Though she calls Yuki and Lefy "Big Brother" and "Big Sister" respectively, she's aware she's not related to them by blood, but she's very, very happy in their home.
* OurVampiresAreDifferent: Aside from drinking blood once a week, one would never know she's a vampire.
* WiseBeyondHerYears: Despite being 8 years old, tops, she knows better than to foolishly flail around against her kidnappers, or foolishly risk her life attacking them, instead biding her time until she can escape, and keeps her methods secret...
[[/folder]]
[[folder: Mofir]]
--> Race: Fenrir
----
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/32727614_2077149552526164_2582055461280808960_n_9.jpg]]
[[caption-width-right:320:Yes, boss.]]Monster summoned by Illuna from a gacha.
* AnimalCompanion: His role in the story.
* FluffyTheTerrible: His name essentially translates to Fluffy and he is one of the strongest creatures in the setting.
* IWasJustPassingThrough: At one point, he rescues a band of adventurers, that were rightly investigating the cause of a monster swarm headed to their home town, by attacking and killing the monster bearing down on them, because he happened to be hunting it, barely casting the adventurers a glance in the process. The adventurers in question wisely leave him alone, especially once they notice his collar...
* UndyingLoyalty: He will serve Yuki, and the residents of the Yuki dungeon, no ifs ands or buts.
[[/folder]]
[[folder: Leila]]
-->Race: Horned-sheep Demon.
----
One of two slaves rescued by Yuki who decided to stay in his dungeon, claiming it's because she wants to serve him to repay him for rescuing her.
* {{Bookworm}}: Reading is her favorite leisure activity.
* FamedInStory: When agents from the Demon King faction call on Yuki and see she's his maid, they're stunned, and indicate she's a celebrity in Demon lands.
* ForScience: The real reason she serves Yuki is that she sees it as a golden opportunity to study a Demon Lord, up close and personal. Being treated kindly is a very welcome bonus.
* HappinessInSlavery: A mix of the life-debt and beloved servant categories. She chooses to serve Yuki because he treats her kindly and because he saved her from AFateWorseThanDeath.
* HornedHumanoid: She has sheep's horns on her head, but is otherwise human.
* {{Meido}}: Her official role in Yuki's dungeon.
* MoodKiller: To the point of InterruptedIntimacy. Leila, of all people, interrupts the one and only scene in volumes one and two where Yuki and Lefy actually start getting ... frisky with each other, and shuts it down as effectively as if she poured a bucket of cold water on their heads.
* MysteriousWaif: There's a lot to her backstory that she's hiding.
* OurDemonsAreDifferent: Aside from the horns on her head, she could easily pass for a human.
[[/folder]]
[[folder: Lyuuinne Gyroll/Lyuu]]
-->Race: Beast-kin, subspecies, Warwolf.
----
The second slave rescued by Yuuki who decides to live in the Yuki dungeon, supposedly because she wants to be close to his pet Fenrir, which is sacred to warwolves.
* AccidentalProposal: When her father and his tribe try to traverse Wicked Forest, said parent goes OverprotectiveDad and tries to drag her home, by force, to push her into the very same ArrangedMarriage she fled from. As to be expected, this pisses off Yuki beyond measure, the two men fight, and Yuki states that as long as Lyuu wants to stay, he will cherish and protect her. It isn't but a matter of seconds when Yuki realized that such a line is a marriage proposal in many cultures, including the tribe Lyuu's from.
* AscendedFangirl: Of Mofir. Her race worships Fenrirs as gods. Being up close and personal to one is her greatest joy, to Mofir's annoyance.
* LittleBitBeastly: If not for her wolf ears and tail, she'd be a very attractive human woman.
* {{Meido}}: She also serves as a maid in Yuki's dungeon.
* RunawayBride: She fled an ArrangedMarriage to a guy she doesn't like, and she proves justified when we meet the clod, who thinks way, way too highly of himself and isn't long for this earth due to his combined MilesGloriosus and LeeroyJenkins lifestyle.
[[/folder]]
[[folder: Nell]]
[[quoteright:316:https://static.tvtropes.org/pmwiki/pub/images/32739206_2077150212526098_401217994908237824_n.jpg]]
[[caption-width-right:316:I won't let you hurt the innocent!]]A "hero" raised by the human church, and sent after Yuki by the overly ambitious and "patriotic" prince Ryuit Glorrio Allysia of the human kingdom to eliminate Yuki.
* AnguishedDeclarationOfLove: Immediately after Yuki saved her life, just before she fell unconscious, she blurts out "I love.." and passed out. Yuki turns in the direction of the fiends involved in harming her, and unleashed literal nightmare fuel upon all of them.
* BornLucky: Her luck skill is in the thousands!
* ChildSoldier: Deconstructed. She endured a great deal of training, and was given powerful abilities, but when she found herself in Yuki's "Haunted House," she completely broke down into a sobbing mess.
* TheDeterminator: Deconstructed and going into FatalFlaw territory. She will not give up in heroic pursuits, even ignoring her fatigue, until she either succeeds, or dies. Yuki, being highly concerned for her well-being, sees this as a flaw.
* HeroAntagonist: Briefly. She is a genuine hero, but as humanity's trump card, she just happened to be at odds with Yuki, until she met him in person and realized with her own eyes that he's not AlwaysChaoticEvil like other Demon Lords she was briefed on.
* HeroesPreferSwords: She does, though she treasures the Dagger Yuki gifted her that he forged, either from the leftovers in making Zaien, or in the research process leading up to said creation. Either way, since it's a weapon far, ''far'' better than anything she could ever hope to come across, she diligently trained in mastering its use.
* HeroicWannabe: A rare positive example. Despite already having the "Hero" title, she wants to be known as a hero for the merit of her words and actions, not because some priest somewhere said "you're the hero, now go slay our country's enemies with gusto!" Even Yuki, who ''loathes heroes to the point of revulsion'' respects her dedication to this, and treats her kindly.
* HiddenBuxom: According to Yuki, her armor hides a decent pair of tits, which he gets to spot due to the fact [[AccidentalPervert that she was changing in his throne room when he teleported in.]]
* HoldTheLine: In protecting the helpless women and children of Winged Dragon Clan, she sets up a barrier and then faces the entire enemy army, head on, so that the helpless can flee, and call for help, and she holds them off ''all night long.''
* HorribleJudgeOfCharacter: While her assessment of Yuki and Lefy is quite correct, her assertion that Prince Ryuit is a good person, [[WellIntentionedExtremist or at least means well]], is way off the mark.
* KnifeNut: She has reached the third level of dagger mastery using the dagger Yuki gifted her. She's so skilled, she can literally disarm people with it.
* PerpetualPoverty: The primary reason she agreed to become "the hero" is that her family's well below the poverty line, and the church promised them just a bit better lifestyle.
* PervertRevengeMode: Double Subverted. When Yuki teleports into his throne room, a public place, and he sees her topless, they both freeze and their eyes lock for some time. When Yuki's brain finishes rebooting, he makes an off-hand comment admiring her breasts. She pelts him in response.
* SkilledButNaive: She is indeed quite talented with the sword, but she's easily fooled and tends to "go with the flow" way too quickly.
* SureLetsGoWithThat: When her superior Carlotta gives her an assessment of Yuki and his motivations for helping the church deal with the EvilPrince that is giving them all grief, she lampshades the trope by name, since Carlotta's assessment is marginally correct.
* UnwittingPawn: She was sent to attack Yuki under the premise that he was threatening "innocent people." When Yuki pointed out how anything-but-innocent his victims were, she stood down completely.
* WackyMarriageProposal: Possibly the wackiest in fiction or reality. In chapter 181, Lefi announces to Yuki that the household would be thrilled at Nell being the newest wife, with Nell herself in attendance, blushing, squirming, and squeeing like the SmittenTeenageGirl she is. Coming from modern Japan, Yuki's brain goes "Does not compute."
[[/folder]]
[[folder: Zaien]]
A sword Yuki forges from a cursed axe he confiscates from the villain Dorga, and a discarded "hero's sword" he finds in a weapon shop and buys for cheap.
* AffectionateNickName: Once she sports a humanoid avatar, Yuki is fond of calling her Enne, and she likes it.
* BecauseYouWereNiceToMe: She's tickled pink to be Yuki's sword, because he dotes on her, talks to her, and treasures her, as opposed to all the other wielders who let the evil spirits take them over, or were even worse, and just lashed out with abandon, until they died, and joined the howling maelstrom of malevolence.
* {{BFS}}: Is one. As a sword, is so massive, even Yuki with his Arch-demon SuperStrength can barely wield it.
* BloodKnight: Combined with HungryWeapon Even though Yuki's forging process removes the curse and makes the vengeful souls happy to serve, the weapon is still quite literally bloodthirsty, [[LesserOfTwoEvils but hey, "baby steps."]]
* ComicallySerious: She's very dead-pan and stiff, taking everything way too seriously, but she still pouts like a little kid and beams wholeheartedly when her few wishes get granted. [[DotingParent This makes Yuki want to spoil her rotten.]]
* DeathSeeker: While still trapped in the cursed axe briefly wielded by Drogan. She's ''ecstatic'' when Yuki took possession because he muted, if not eliminated, the screeching, howling, blood-crazed voices of the malevolent spirits that she was stuck with and were drowning her out.
* EmpathicWeapon: It's self aware and serves Yuki willingly.
* HatesBeingAlone: Wants to be at Yuki's side, constantly, and hates being placed in storage. As big as she is, this causes issues.
* NoBiologicalSex: As expected of a sword, she has no gender but identifies as female, purely because it feels comfortable.
* OurPhlebotinumChild: As Lefi herself lampshades.
-->'''Lefi:''' "I would have never dreamed that you would literally make a child with your own hands simply because two children is not enough for you!"
* SuddenlyVoiced: She speaks to Yuki, in the presence of Lefi in chapter 120, shocking both of them.
* SympatheticPOV: We get to see how she became sentient and what she thinks of being Yuki's weapon for the vast majority of chapter 120.
* UndyingLoyalty: Lives and would die for Yuki, without hesitation.
* WhenSheSmiles: ''Everybody'' absolutely melts when they see her smile.
[[/folder]]
! Antagonists
[[folder: Prince Ryuit Glorrio Allysia]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/ryuit.jpg]]
[[caption-width-right:350:That cowardly king will doom us all!]]The prince of the kingdom of Allysia
* AmbitionIsEvil: His PatrioticFervor makes him want to expand his country's borders at all costs, and only sees Haunted Forest as prime grade A real-estate, ripe for development. He doesn't care who he has to step over to get it.
* BullyingADragon: Quite literally. Since he has deluded himself into thinking that Haunted Forest is populated only by mindless beasts, and there ''is no Supreme Dragon Leficious'', he keeps sending troops, trying to provoke said "mythical" dragon by attacking her home, wholly overconfident in the strength of his country's armies and magical tools.
* TheCaligula: His rigid self-righteousness and utter refusal to heed contrary opinions or even doubt anything he considers "fact" makes him entirely unsuited to rule, but he refuses to believe it. If the nation, starting with the capital, isn't willing to bolster his glory and be grateful for his non-existent "benevolence," then it can just burn to the ground with him.
* TheCoup: [[spoiler: When his plans blow up in his face, twice, and both the nobles of his faction, and the church who trained Nell turn, and start putting pressure on him, he sends covert ops troops everywhere to cause chaos as a distraction, so he can seize the crown for himself.]]
* TheDeterminator: Deconstructed. Once he sets upon a goal, he will not stop, regardless of the cost, setbacks, or counsel he gets against it. He fails to see how this can possibly be a demerit because once he sets down ''the wrong path'', he will utterly refuse to abandon it, no matter what happens to him, or those around him.
* GlorySeeker: All he cares about, aside from filling his coffers, is making a name for himself.
* HollywoodTactics: His tactics do have some merit, on paper. In reality... not so much.
* IRejectYourReality: He has deluded himself into thinking Supreme Dragon Leficious is a myth, and does not exist.
* IveComeTooFar: After the second time he tried, and failed, to invade Haunted Forest, against King's orders, he had to either take control of the country, or as Yuki put it...
--->"He'd be royally fucked without lube."
* NiceJobFixingItVillain: [[spoiler: By launching a coup against his own father, he gives Yuki the perfect vehicle, and cover, to infiltrate the capital to deal with him directly.]]
* PatrioticFervor: His FatalFlaw. He takes the love of his country (not exactly its people) to an extremely unhealthy degree, and if he had the ability, would go to all-out war over the tiniest of slights, real or imagined, upon the principles he thinks his country stands for. He constantly chafes against his father, the king, who is more cautious and pragmatic, and is most certainly opposed to stirring up the hornet's nest known as Haunted Forest.
* ReignOfTerror: What he launches while trying to take the throne.
* SuicidalOverconfidence: As officially noted in his character description, he's wholly convinced that the moment he takes control of any situation, things will go his way.
* SunkCostFallacy: His army gets torn apart going after Yuki, the Demon Lord? The army wasn't big enough, send a bigger one! Wait, can't do that right now? Let's send in TheHero, alone, with no plan, preparation, or back-up! If that fails, we'll send in the Orihalcum party of adventurers who are usually deployed only in cases of nation-level disasters!
* TautologicalTemplar: Since he believes his goal of expanding his country's borders and influence is inherently just, then anything he does in pursuit of that goal is itself inherently just. Even his father's royal decree(s) won't change his mind about this, at all.
* UnwittingPawn: Combined with PeoplePuppets and DeadAllAlong. [[spoiler: A demon took control of his corpse and instigated a civil war in the kingdom, for ends unknown.]]
* VillainHasAPoint: Although Yuki and Lefy were right to chase down the slavers that kidnapped Illuna, an armed invasion demands a response, or other nations will think that invading is the correct method of "diplomacy" to get what they want or need. Unfortunately, the response he chose is so ill considered that he's just making things worse, but he refuses to believe it.
* VillainWithGoodPublicity: As the crown prince, he has access to the nation's bully pulpit and can spin any and every story to his advantage, which he does unashamedly and unabashedly.
* WhatCouldPossiblyGoWrong: He not only launched the expedition against king's orders, he promised a great many profits to his aristocratic backers to get the army he used, without sending any scouts first. Then he sends TheHero there alone...
* WrongGenreSavvy: Since conquering the Haunted Forest is so difficult, there must be some great treasure there.
[[/folder]]
[[folder: Dorga]]
The leader of a six-man pack of thugs that foolishly "ambush" Yuki, Lefy, and Dell in a back alley... after tracking him from the Adventurer's guild and seeing him unload corpses of monsters for cash.
* AxeCrazy: Invoked and Literally. He is barely able to do anything but attack with wild abandon while he wields his cursed axe.
* AnAxeToGrind: He prefers war-axes as his WeaponOfChoice.
* EntertaininglyWrong: He not only thinks Yuki stole the monster corpses, that left the adventurer's guild in awe, from seasoned adventurers, but concludes that Lefy is a demon because a magical tool he carries says she's not actually human.
* GodzillaThreshold: When Yuki proves able to beat his men to a pulp without even trying, he whips out a cursed axe that he knows is going to literally drive him crazy, but doesn't think he has any other choice.
* {{Gonk}}: Yuki notes that he's unattractive, and the sheer mass of muscles he sports only makes it worse.
* InformedAttribute: One of his skills is "Crisis Detection Lvl III" yet he goes and provokes a Demon Lord and Supreme Dragon Lefy, even threatening the latter with gang-rape.
* MuggingTheMonster: Exactly like the muggers who attacked Chuck Norris thought his martial arts moves were fakes, this clown thinks Yuki's monster corpses weren't actually his kills, and went purely by body-type and appearance, so he stalks and attacks him in an alley.
* NiceJobFixingItVillain: His threat to gang-rape Lefy leads to Yuki calling her "his woman" in a fit of rage, which makes her realize how he feels about her, and how ''she'' feels about ''him''.
* SerialRapist: When Yuki uses "analyze" on him, he finds a title proclaiming that he's exactly that.
* TestosteronePoisoning: His entire frame had way too many muscles on it for his own good.
* TooDumbToLive: Even if Yuki ''had'' stolen those monster corpses, he had to be skilled enough to get close to the adventurers that killed the monsters, while the adventurers were actively doing the killing, and there's no way anyone like that would want the story getting out...
[[/folder]]
[[folder: Legillus]]
An orhicalcum class adventurer Prince Ryuit hires to guard the castle gates.
* BeatStillMyHeart: Yuki has to literally rip his heart out to stop him.
* BloodKnight: He seeks out battles to the death, caring not a bit for context or situation.
* InterplayOfSexAndViolence: He gets sexual arousal from battles to the death, and orgasmic glee, win or lose.
* MajorInjuryUnderreaction: Combined with MadeOfIron. A blow that takes out a major portion of his chest and abdomen isn't enough to stop him, or even slow him down.
* RedBaron: "The War Freak."
* UltimateJobSecurity: His obsession with battles to the death, being a living ball of chaos, indiscriminate threat to friend and foe, makes everyone avoid him at all costs whenever possible, but his strength as an orihalcum level adventurer makes it impossible for the Adventurer's Guild to fire, or imprison him, as he would deserve in any other setting. The Adventurer's Guild, as a whole, can't control him in any way.
[[/folder]]
[[folder:Gilordio Gyogarr]]
A black dragon "acquaintance" of Leficious.
* AmbitionIsEvil: Wants to take over the world, exterminating all the other races in the process. Even at her most unsympathetic, Lefi wouldn't flatten countries without cause.
* AndNowYouMustMarryMe: To Lefi. He ''orders'' her to marry him, after he somehow usurped the throne of the Dragon king from his predecessor. This ticks Yuki off so much that Yuki has to kill the guy, personally.
* CompeteForTheMaidensHand: What his fight with Yuki was all about. What he didn't realize was that even if he had won, Lefi wouldn't have married him anyway, seeing as she only saw him as a petulant child too big for his britches.
* DarkIsEvil: He's a black dragon, and is an arrogant, cocky, detestable sot.
* HoistByHisOwnPetard: Gets his BreathWeapon turned against him, ''twice.''
* HumansAreInsects: He insists on calling Yuki, the demon lord, an insect, and is insulted upon seeing Lefi with a humanoid form.
* {{Hypocrite}}: "Stop using cheap tricks" says the guy who clearly won the seat of "Dragon King" by underhanded tricks.
* JustToyingWithThem: Which comes back to bite him when Yuki pulls out the stops and starts using dungeon traps to mess him up, good.
%%* OffWithHisHead: How he dies.
* SuicidalOverconfidence: He flies up to Yuki's dungeon, lands, and demands Leficious, the supreme dragon, marry him.
* VillainousBreakdown: When he thinks he's killed Yuki, only to see the latter stand up again, barely holding it together, he panics and completely loses it.
* VirtueIsWeakness: He proclaims all the elder dragons as "senile" because they weren't keen on exterminating all the other races of the world.
* WeCanRuleTogether: He promises Lefi rulership of the world if she marries him. She refuses outright.
[[/folder]]
[[folder: Lord Gojim]]
Leader of the "True Blood Fiends" factions of the Demons.
* AmbitionIsEvil: Wants to lay claim to the demon throne, and use it to launch a war of conquest on all the other races of the world, regardless of the means, fair or foul, though mostly foul.
* AuthorityInNameOnly: He is a figurehead for the "fiends", and he knows it. In fact, he happily lets them do whatever they want most of the time, as he's well aware that he has no leadership skills.
* AwakeningTheSleepingGiant: He and his "Fiend" faction attack the Winged Demon Clan in the middle of the night, even targeting women and helpless children, because they couldn't ignore a power bloc of that magnitude and failed to sway them to their side. Rather than eliminating this "unstable variable" and supplanting them with loyal puppets like they intended, encountering the hero Nell, who proved way stronger, determined, and righteous than they could have imagined, has convinced the Winged Demons to take up arms against the Fiends, on the side of King Phryne, and Yuki's appearance to rescue Nell also completely annihilated a significant part of their faction. Even so, Gojim is unswayed, confident his plans have already reached a point where nobody can stop him anymore.
* BelievingTheirOwnLies: He genuinely believes he's honorable, brave, and has the moral high ground against King Phryne and the peaceful faction of the Demon Kingdom. While he's no pushover and is armed with a cursed blade at least as powerful as Zaien, he's an honorless coward who only fights people weaker than himself, whenever he has a choice, and happily sends troops against women and children if their faction doesn't agree with him.
* DramaticIrony: His followers bring forward perfectly sound reasons to believe that Yuki is the least likely, among a list of four suspects, to be the masked man that is largely responsible for rescuing Nell and scuppering most of his plans, as well as absolutely decimating his army. The most compelling of which are the fact that Yuki's dungeon is over a week away, by the fastest possible transport, and is situated in a very dangerous area, presumably under constant threat. It just so happens that Yuki is indeed the masked "mercenary" who did so, and did it not for money or fame, but because he's got a serious personal grudge. Not to mention that the biggest threat to Yuki's dungeon, the Supreme Dragon Leficious, ''happens to be Yuki's wife!''
* EvilRedHead: Red hair and a particularly nasty sot who sends assassins by the army-load against his political enemies or their supporters.
* MortonsFork: Invoked. When Yuki makes an official challenge against him, personally, by throwing a sword dropped by his last arena opponent at his head, he's got only two options, go down to the arena and fight, or risk having his entire faction see him as the craven coward he actually is, in public, causing the "honor" of his so-called cause to be questioned, and risking his faction's collapse, not to mention a public airing of his dirty laundry. He chooses to go fight, openly throwing off his retainers when they try to stop him.
* NonchalantDodge: Dodges a sword that Yuki throws at him, and the chair he's sitting in, just by moving his head slightly to the side, not even breaking his posture.
* SlaveToPR: His entire "campaign" is built upon the illusion that his faction is genuinely stronger than the demon king's, through actual might, not subterfuge, cowardice, and wanton slaughter of the helpless, including women and children. As such, he ''openly throws off'' his supporters when Yuki openly challenges him to a duel, despite being well aware that Yuki is very, very dangerous, because he doesn't dare appear weak or cowardly in public.
* SunkCostFallacy: Up to eleven. He and his faction suffered major losses to Yuki, Nell, and King Phryne's elite counter-insurgent forces, and rather than admit they might, just might, have an untenable position, in both assets and ideology, their morale ''is actually invigorated'' because they see themselves avenging their fallen and continuing on down their path of conquest as the height of noble acts, and turning away from their warmongering as an insult to their deaths, making their "sacrifices" meaningless.
* {{Warhawk}}: Openly cries for total war against the humans, beastmen, and other races of the world, to prove the demon's dominance, and superiority. He sees all demons that refuse to join his banner, whether they actively oppose him or not, as traitors that don't deserve to live.
[[/folder]]
[[folder: Baron Argus]]
One of the most glaring self-important nobles who think King Reid is a senile old coot that's been on the throne too long and needs to be replaced, as well as removing Nell from the "Hero" spot and replacing her with a new "hero" easier to manipulate.
* AmbitionIsEvil: All his villainy was spurred by the thought of being as close to the throne as possible without actually becoming the next king.
%%* AristocratsAreEvil: A noble and a total asshat.
* EngineeredHeroics: The cornerstone of his plans was discrediting Nell by engineering crises and then swooping in to "solve" them. He does this, twice. Once by having an agent provoke a swarm of monsters and then have said monsters descend upon a town where Nell had to cross to reach the capital and then blame Nell for the resulting casualties. Not only did Nell (and Yuki) completely curbstomp the massive monster army, but they exposed the agent. Said agent wound up left to the the mercy of the monster survivors. Then again, in the royal capital, he has his men instigate a riot while Nell and Yuuki were in a ball with the king, swooping in at the last possible moment, trying to discredit Nell by showing that even though she was present, she didn't do squat. Yuki, having several recording devices in his mansion not only scuppered his plans, but brought hard evidence against him forward to the ball, and exposed his crimes to all the other nobility, including the king.
* NeverMyFault: When evidence of his crimes is brought before him, he tries to weasel out with all sorts of excuses, and even asks Jaynor for help, teary eyed, saying he's done nothing wrong. Jaynor drops him like a hot potato in return.
* SmugSnake: He thinks and acts like he's the smartest man in the room. He's not.
* UnwittingPawn: To Defense Minister Jaynor. Jaynor let him think he was a subordinate, but never actually had his back.
[[/folder]]
[[folder: Defense Minister Jaynor Redrius]]
The mastermind behind the "Depose Nell" plan launched by Argus.
%%* TheChessmaster: He's always got plots within plots going.
* DoNotTauntCthulhu: He boasts of Nell being a useful tool to Yuki, right in the latter's face. When Yuki grabs his throat and threatens to pop his head off like a Pez dispenser, he quickly realizes what a bad idea that was and apologizes while he can still (barely) speak.
* KarmaHoudini: Since there's no direct evidence of his collusion, he's not going to face any punishment, and he knows it, so he doesn't see an issue with rubbing Yuki's face in it.
* ManipulativeBastard: He had Nell, Yuki, Argus, even the king within the palm of his hands, and still does.
* AMillionIsAStatistic: He was perfectly willing to sacrifice an entire city for the sake of his plans.
--> "It is better to lose a city than a war."
* MoralSociopathy: He truly is working in the best interests of his country, as he sees them, anyway, and only sees people as tools to that end. When he called Nell a tool, he realizes it's Yuki's BerserkButton.
* PlausibleDeniability: He had Argus strung along so well that the latter never realized that all the dirty work had his signature on it, leaving no evidence of Jaynor's involvement, until it was too late.
* RealPolitik: All that matters to him is that his nation prospers. The means are of little relevance.
* XanatosGambit: No matter how the incident turned out, his goals would have been met. Nell gets disgraced and replaced by another "hero"? Well, her relationship with Yuki wouldn't give the surrounding countries Casus Belli to attack because she'd already been disgraced and cast out. Nell and Yuki win the day and expose Argus's schemes? A bunch of corrupt nobles and other bad actors get purged. Nell and Yuki get married, while Nell's still the "hero"? The kingdom just got a powerful new ally since Yuki's not going to let anyone mess with his lover!
[[/folder]]
! Others
[[folder:Raylow Lurubia]]
The mayor of the town of Alyfro.
* IgnoredExpert: He is denied an audience with King Reiyd Glorrio Allysia outright, after Yuki and Leficious chase down the slaver gang that abducted Illuna, and the rest of the government in the kingdom of Allysia outright ignore his first hand account concerning his experience, despite the fact that his town is right smack on the front lines. [[TheSoCalledCoward Then they have the gall to be shocked that he provides them absolutely zero support on their ventures that would easily destroy their country.]]
* KnowWhenToFoldEm: When a Demon Lord, Supreme Dragon, and a wing of 100 dragons descend upon your town, you had best bow and scrape right away, and hope you can bow and scrape enough to keep from getting blasted to oblivion.
* MyCountryRightOrWrong: Even though he knows his country's government is entirely in the wrong by repeatedly antagonizing Yuki with armed invasions into Haunted Forest, he won't give up secret information, even if his town would be spared in exchange. Yuki is duly impressed by that level of devotion, especially to a country government that almost clearly does not deserve it.
* NervousWreck: Invoked and Justified. When your town is on the border of a monster-filled forest, the two leaders of said forest can show up at any time, with an army of 100 dragons, and your government just keeps on poking that hornet's nest, just to see what happens, despite your objections, it's certainly going to fray your nerves quite a bit.
* PleaseKillMeIfItSatisfiesYou: When he sees Yuki and Lefy in his office ''a second time'', he fully expected they were there to deliver DisproportionateRetribution for the repeated armed invasions into Haunted Forest, and offered up his own life if they would promise to leave his town alone. He was gobsmacked when Yuki simply wanted to peacefully redress his grievance by being told who the actual perpetrator is.
* TallPoppySyndrome: On the receiving end. He's well aware that most, if not all, of the other nobles of his country ''loathe'' him because he earned his noble title, by merit, not bloodline, and see him as an upstart, his city has the strongest adventurers and soldiers in the country because they are at the boundary of Haunted Forest, his city is prosperous, despite the constant threat of monster invasions, and the icing on the cake? His troops pulled back when Yuki gave fair warning, thus surviving, while the rest of the nobles' forces foolishly continued to pursue their aggression and were utterly annihilated.
* WhatWereYouThinking: When he hears from Nell, the hero herself, how she was sent to subdue Yuki, alone, and was surprised that not only did he spare her, but revealed that the situation clearly does not match what she was told in her briefing, Mayor Raylow blew his stack, and lampshades the trope by name, screaming at his government's arrogance, idiocy, and incompetence, while pounding on his furniture.
* WrongGenreSavvy: He fully expected Yuki and Lefy to go full-tilt OmnicidalManiac after being antagonized by his country's repeated armed invasions. He's wide-eyed with shock when Yuki comes to him seeking peaceful redress, and the identity of the actual guilty party or parties.
[[/folder]]
[[folder: King Reiyd Glorrio Allysia]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/reid_9.jpg]]
[[caption-width-right:350:Don't touch Haunted Forest!]]The reigning monarch in the kingdom of Allysia.
* ForcedToWatch: In the castle's dungeons, he's chained to a wall in a cell across from where his daughter, also in chains, was getting brutalized by one of Prince Ryuit's thugs' for ''sexual arousal.'' Fortunately for the king and the little girl, Yuki came along [[BerserkButton and saw it.]]
* TheGoodKing: He may not be a powerful general, or fight on the front lines, but his economic and diplomatic efforts provide a very high standard of living for his subjects. In fact, the kingdom of Allysia is the most prosperous country in the world, precisely because of him.
* ItsAllMyFault: Blames himself, entirely, for his eldest son's fate.
* ReasonableAuthorityFigure: He, wisely, was willing to overlook the invasion and temporary occupation of Alyford because the targets were all members of a criminal organization, and unlike his son, knew full well that said organization were the actual aggressors. Not to mention, he knows full well that antagonizing Haunted Forest will ''easily'' bring the doom of his nation.
* TheSoCalledCoward: Though his son never says it to his face, for fear of the due repercussions, he thinks the king is a coward for not immediately mobilizing troops to the Haunted forest in retaliation towards Yuki's and Lefy's attack.
* ThreatBackfire: When Yuki makes crystal clear that should the king go after Haunted Forest, for any reason, Yuki would kill him, leaving his daughter an orphan crying over his grave, the king smiles and retorts that traditionally, the threat would have been made against his daughter instead. This leaves Yuki so stunned, he states that his facial expression would likely be that [[ShoutOut of a shocked Pikachu.]]
* UncertainDoom: He's officially gone missing. Nobody currently knows if he's alive or dead. [[spoiler: He's later found imprisoned in the castle dungeons.]]
[[/folder]]
[[folder: Gamdia Roston]]
Former commander of the Knight order, and the only commanding officer to survive the ill-conceived attack on Haunted Forest.
* CassandraTruth: He went to warn his superiors about how badly they were outmatched. He was ignored.
* KnowWhenToFoldEm: When the Demon Lord seemingly teleports into your tent in the middle of the night, and says you'd be insects before his wrath, letting you depart only because it would be too bothersome to kill you, getting the hell out of Dodge is the right idea.
* ScrewThisImOuttaHere: He took his squad and retreated when given the chance. Said squad were the only survivors.
* TheSoCalledCoward: Because he wisely withdrew from a battle he had absolutely no chance of winning when given the chance, his superiors in the chain of command, especially the crown prince, dubbed him a coward and stripped his command. He and his squad consider this a small price for getting out of hell alive.
[[/folder]]
[[folder: Carlotta]]
The head of the church, and the one who trained Nell to be humanity's "Hero."
* AsskickingEqualsAuthority: Strongest member of the church, even beating Nell, and its leader.
* AwesomeByAnalysis: While she never manages to penetrate Yuki's "Disguise" spell completely, failing to recognize him as the Demon Lord, simply from examining his footprints, she's well aware that he's hiding his true strength, [[IJustWantToBeFree because he values his freedom.]]
%%* BeautyEqualsGoodness: Physically attractive and morally upright.
* TheChessmaster: While she is very benevolent, she does always have plans within plans going. This terrifies Yuki.
* EntertaininglyWrong: Her assessment of Yuki and his motives is only right in one area, his character. In everything else, she's only marginally correct.
* FriendToAllChildren: She runs an orphanage, in addition to her duties for the church. The kids all love her.
%%* HighPriest: Leads the church and is its strongest paladin.
* IfOnlyYouKnew: She constantly sings Yuki's praises and would love to recruit him to the church, to aid against enemies foreign and domestic, especially the Demon Lord, but she's not aware that he's the very demon lord she wants to fight against.
* LaResistance: She and the church are not keen on living under the rule of Prince Ryuit, and with good reason.
%%* MagicKnight: Powerful knight, and priest.
%%* AMotherToHerMen: Treasures her subordinates dearly.
%%* RousingSpeech: She goes into one, in detail, as she prepares to deal with the EvilPrince.
* ScarpiaUltimatum: On the receiving end. A group of corrupt knights attempt to forcefully confiscate food from her orphanage and the starving children therein. Said knights "offer" to let the children eat unmolested, for the most part, if she allows herself to be passed around and "sampled" instead, with a sick, perverted laugh. Neither she nor her allies are amused. When she refuses, said knights then proceed to go after the children with swords...
[[/folder]]
[[folder: Princess Iryll]]
The young daughter of King Reyid
%%* CheerfulChild: Very sweet and happy child.
%%* ChildrenAreInnocent: A very sweet and adorable child.
* FreakyIsCool: She adores Yuki's Demon Lord traits, including his wings.
* HateAtFirstSight: She and Illuna immediately and instinctively realized that they're always going to be at odds, and within minutes sized each other up and quickly proceeded to yank each other's cheeks until they were both badly bruised, and for no rational reason.
* PrecociousCrush: As a direct result of unintended RescueRomance. Because Yuki rescued her from the deprivations of her elder brother and his gang of thugs, she's gone and written him a love letter, which Nell delivers into his hands in chapter 152. Yuki is rightly concerned on how he's possibly going to answer such a letter.
* ThreatBackfire: When she gets on Yuki's nerves by calling him a hero, he looks to intimidate her by revealing he's the Demon Lord. She responds with glee and amazement, to his confusion.
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