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Protagonist

     Yuki 
Race: Arch Demon Demon Lord

https://static.tvtropes.org/pmwiki/pub/images/41830074_2175871609320624_379480869070438400_n.jpg
Bow before the great demon lord!
Originally a human from Earth, but reincarnated as a Demon Lord and bound to a dungeon.

  • Accidental Marriage: 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...
  • Achievements in Ignorance: Most of his accomplishments are a direct result of a lucky (or unlucky) accident.
  • Awesome by Analysis: 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 realizing Leficious has a powerful sweet tooth because he smelled honey on her breath.
  • Badass Pacifist: 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.
  • Bathtub Bonding: When he fashions a spa, both Illuna and Leficious barge in on him and join him in its use.
  • Berserk Button: 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 it where it occurred by Leficious pinning him to the ground and making him stop.
    • 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 fucking kill you dead!
  • Big Brother Instinct: Mess with Illuna, and your life is forfeit.
  • Born Unlucky: His luck skill is 70, everybody else, including a slime he summons, have luck stats better than that.
  • Bullying a Dragon: It doesn't take long, after Leficious moves into his home, that he starts treating her like a Bratty Half-Pint. She lets him do it because she finds it amusing.
  • Contagious Heroism: 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.
  • Dark Is Not Evil: 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.
  • Deliberate Injury Gambit: In chapter 102, he takes a sword strike to his arm to avoid one to his head.
  • Fantastic Arousal: He learns that his demon's wings are erogenous zones when Leficious starts to rub them...
  • Fish out of Water: It takes him a great deal of time and effort to learn how to live in this new world.
  • Flat-Earth Atheist: Played with. While he was an Athiest 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.
  • Friend to All Children: 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 "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.
  • Genre Savvy: To the point of Leaning on the Fourth Wall. 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.
  • Good Cannot Comprehend Evil: 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 starving orphan child for the "crime" of accidentally bumping into them with the very stew they're trying to confiscate, Yuki literally goes "What the fuck, dude?!"
  • Good Feels Good: He does heroic things because he enjoys it.
  • Good Is Not Nice: 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.
  • Hero with Bad Publicity: 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.
  • Humans Are Insects: When he's asked why he was giving fair warning, he equated the invading human army 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.
  • Ideal Hero: 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.
  • Ignorant Of His OwnIgnorance: 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.
  • I'm Not a Hero, I'm...: He hates "heroes", especially those who boast of their selflessness, and pointedly does not want to be one.
  • I Warned You: 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? Cruel and Unusual Death.
  • Kirk Summation: 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 Unwitting Pawn. She gets better.
  • Like an Old Married Couple: With Leficious. The two of them act like they've been married for years.
  • Magic Eye: As a result of being a demon lord, he has a red eye that allows him to check the Dungeon "menu" at any time.
  • Mistaken for Pedophile: All the time. Leficious only looks like a pre-teen, but is Really 700 Years Old, and he's accidentally married to Illuna who actually is a pre-teen.
  • Morality Chain: His very existence is the primary reason Leficious isn't currently going on rampages to slake her boredom.
  • Right for the Wrong Reasons: 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...
  • Roaring Rampage of Rescue: 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.
  • Rule of Cool: In universe. He does strange, and often impractical, things because he's fascinated with projecting a "cool" image of himself.
  • Secretly Selfish: 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 Ideal Hero.
  • Showy Invincible Hero: 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.
  • Sudden Game Interface: 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.
  • Tastes Like Friendship: He "tames" Leficious, the Supreme Dragon, by offering her chocolate and other sweets.
  • The Unfettered: He lives by his own rules, on his own schedule, and only does things, or listens to people, that he wants to.
  • What's Up, King Dude?: 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 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.
  • Wild Card: Despite being an Ideal Hero, 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.
  • Would Not Hit a Girl: 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.
  • Would Not Hurt A Child: 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.
  • You Are What You Hate: He loathes heroes to the point of revulsion, seeing himself as a Villain Protagonist. Paradoxically, this is the trait that keeps him as an Ideal Hero... Which his internal dialog states is the kind that disgusts him most.
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Supporting Characters/Active Allies

     Leficious/Lefy 
Race: Dragon.

https://static.tvtropes.org/pmwiki/pub/images/32768020_2077149305859522_4346084446273798144_n.jpg
Thou hast best appreciate mine, The Supreme Dragon's, benevolence, Demon Lord.
The very first being Yuki meets in the new world.
  • Because You Were Nice to Me: 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.
  • Big Eater: If left to her own devices, she would eat a week's worth of food for two people in a single sitting, while sporting her humanoid body...
  • Bratty Half-Pint: She may be a thousands-year-old dragon, but she behaves like a spoiled middle-schooler.
  • Disproportionate Retribution: Annoy her, and a wing of 100 dragons will descend on your city, if she's feeling generous...
  • Fantastic Arousal: 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...
  • Friendly Address Privileges: She allows those close to her, like Yuki, to call her Lefy.
  • Godzilla Threshold: While she could easily devastate the royal capital, especially The Evil Prince who keeps harassing and threatening him, Yuki is loathe to ask her to do it, because she's so powerful she lacks the fine control to keep from leveling the country in its entirety, by accident.
  • Hidden Depths: 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.
  • It Amused Me: The reason she goes on rampages, stomping demon lords, dungeons, and human cities flat? She's bored and wants amusement.
  • Lazy Bum: Unless she's being actively entertained, she prefers to just loaf around.
  • Lethal Chef: 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 Power Incontinence. 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, just to show he cares.
  • Little Bit Beastly: If not for her horns and tail, she could easily pass for human.
  • Naked First Impression: She starts the story nude. As a dragon, this isn't an issue. When she adopts a pre-teen human form...
  • Person of Mass Destruction: Even in her humanoid form, she can level countries, and easily smack down Yuki if she ever feels the need for violence.
  • Phlebotinum Battery: The only reason she avoids Pretty Freeloader is that her very existence in Yuki's dungeon provides a large amount of DP (dungeon points) that he needs to live.
  • Power Incontinence: Her power level is so great, that when she aids Nell to deal with a Zombie Apocalypse, her weakest spells destroyed two houses, one by fire, and the other by flood.
  • Property of Love: 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...
  • Shameless Fanservice Girl: 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.
  • Shana Clone: Aside from lacking A-Cup Angst, 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.
  • Sickening Sweethearts: With Yuki.
  • Sore Loser: 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.
  • Sweet Tooth: Her Fatal Flaw. 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.
  • Voluntary Shapeshifting: She can assume either her dragon or humanoid form at will. She chooses to remain humanoid for convenience in Yuki's dungeon.
  • Ye Olde Butchered English: How she speaks to display her "superiority" to others. It fades as she grows more and more comfortable in Yuki's home.

     Shii 
—Race: Slime
The first monster Yuki summoned.
  • Good Thing You Can Heal: Upon being summoned, she lunged at a level 21 cerberus, and got swatted into a wall. She was perfectly fine a few minutes later.
  • Like Brother and Sister: 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.
  • No Biological Sex: Slimes don't have genders, but identifies as female because she's copying Illuna, aside from being blue and transparent.
  • The Silent Bob: Yuki can somehow understand her perfectly, despite the fact that she has no speaking lines, at all.
  • Suddenly Voiced: Yuki comes home from a "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.
  • Team Pet: Her primary role in the story.
  • Voluntary Shapeshifting: Through means not fully understood, she learns to take on Illuna's form, aside from being blue and translucent.

     Illuna 
—Race: Vampire
https://static.tvtropes.org/pmwiki/pub/images/32764899_2077148995859553_4715679421615308800_n.jpg
Illuna is currently riding Mofir, with the slime Shii sitting on the fenrir's head.
Yuki's child "bride."

  • Accidental Marriage: Averted. She certainly knew that asking for Yuki's blood was a marriage ritual, but never told him.
  • Adult Fear: She's been kidnapped from right outside her own home, twice, and by the very same group, all of whom, aside from being slavers, have "Rapist" and "Murderer" titles! Plus, the only reason they don't beat, rape, and murder her? They had promised her to a pervert who sees her as a Sex Slave, and she knows it. It's amazing she's as stable as she is.
  • Be Careful What You Wish For: 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...
  • Break the Cutie: A human slaver ring tried, repeatedly. They annoyed both Yuki and Lefy in the process.
  • Cheerful Child: When treated kindly, she's a very sweet and upbeat child.
  • Children Are Innocent: 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.
  • The Cutie: She's adorable on both sides of the fourth wall.
  • Deceased Parents Are the Best: Her parents died fighting, in order to give her a chance to escape genocidal humans looking to kill or enslave her entire village.
  • Doomed Home Town: She is the Last of Her Kind as her home village was wiped out by humans.
  • Fantastic Racism: 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.
  • Hair of Gold, Heart of Gold: Blonde, and sweet all over.
  • Happily Adopted: 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.
  • Our Vampires Are Different: Aside from drinking blood, one would never know she's a vampire.
  • Wise Beyond Her Years: 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...

     Mofir 
Race: Fenrir

https://static.tvtropes.org/pmwiki/pub/images/32727614_2077149552526164_2582055461280808960_n_9.jpg
Yes, boss.
Monster summoned by Illuna from a gacha.
  • Animal Companion: His role in the story.
  • I Was Just Passing Through: 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...
  • Undying Loyalty: He will serve Yuki, and the residents of the Yuki dungeon, no ifs ands or buts.
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     Leila 
Race: Horned-sheep Demon.

One of two slaves rescued by Yuki who decided to stay in his dungeon, due to having nowhere else to go.
  • Bookworm: Reading is her favorite leisure activity.
  • For Science!: 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.
  • Happiness in Slavery: 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 A Fate Worse Than Death.
  • Horned Humanoid: She has sheep's horns on her head, but is otherwise human.
  • Meido: Her official role in Yuki's dungeon.
  • Mood Killer: To the point of Interrupted Intimacy. Leiila, 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.
  • Our Demons Are Different: Aside from the horns on her head, she could easily pass for a human.

     Lyuuinne Gyroll/Lyuu 
Race: Beast-kin, subspecies, Warwolf.

The second slave rescued by Yuuki who decides to live in the Yuki dungeon, due to also having nowhere else to go.
  • Ascended Fangirl: Of Mofir. Her race worships Fenrirs as gods. Being up close and personal to one is her greatest joy, to Mofir's annoyance.
  • Little Bit Beastly: 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.

     Nell 
https://static.tvtropes.org/pmwiki/pub/images/32739206_2077150212526098_401217994908237824_n.jpg
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.
  • Born Lucky: Her luck skill is in the thousands!
  • Child Soldier: 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.
  • Hero Antagonist: 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 Always Chaotic Evil like other Demon Lords she was briefed on.
  • Heroic Wannabe: 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.
  • Horrible Judge of Character: While her assessment of Yuki and Lefy is quite correct, her assertion that Prince Ryuit is a good person, or at least means well, is way off the mark.
  • Perpetual Poverty: 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.
  • Skilled, but Naïve: She is indeed quite talented with the sword, but she's easily fooled and tends to "go with the flow" way too quickly.
  • Sure, Let's Go with That: When her superior Carlotta gives her an assessment of Yuki and his motivations for helping the church deal with the Evil Prince that is giving them all grief, she lampshades the trope by name, since Carlotta's assessment is marginally correct.
  • Unwitting Pawn: 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.

     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.
  • Affectionate Nick Name: Once she sports a humanoid avatar, Yuki is fond of calling her Enne, and she likes it.
  • Because You Were Nice to Me: 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 Super Strength can barely wield it.
  • Blood Knight: Combined with Hungry Weapon Even though Yuki's forging process removes the curse and makes the vengeful souls happy to serve, the weapon is still quite literally bloodthirsty, but hey, "baby steps."
  • Comically Serious: 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. This makes Yuki want to spoil her rotten.
  • Death Seeker: 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.
  • Empathic Weapon: It's self aware and serves Yuki willingly.
  • Hates Being Alone: Wants to be at Yuki's side, constantly, and hates being placed in storage. As big as she is, this causes issues.
  • No Biological Sex: As expected of a sword, she has no gender but identifies as female, purely because it feels comfortable.
  • Our Phlebotinum Child: 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!"
  • Suddenly Voiced: She speaks to Yuki, in the presence of Lefi in chapter 120, shocking both of them.
  • Sympathetic P.O.V.: We get to see how she became sentient and what she thinks of being Yuki's weapon for the vast majority of chapter 120.
  • Undying Loyalty: Lives and would die for Yuki, without hesitation.
  • When She Smiles: Everybody absolutely melts when they see her smile.
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Antagonists

     Prince Ryuit Glorrio Allysia 
The prince of the kingdom of Allysia
  • Ambition Is Evil: His Patriotic Fervor 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.
  • Bullying a Dragon: 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.
  • The Caligula: 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.
  • The Coup: 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.
  • The Determinator: 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.
  • Glory Seeker: All he cares about, aside from filling his coffers, is making a name for himself.
  • Hollywood Tactics: His tactics do have some merit, on paper. In reality... not so much.
  • I Reject Your Reality: He has deluded himself into thinking Supreme Dragon Leficious is a myth, and does not exist.
  • I've Come Too Far: 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."
  • Nice Job Fixing It, Villain!: 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.
  • Patriotic Fervor: His Fatal Flaw. 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.
  • Reign of Terror: What he launches while trying to take the throne.
  • Suicidal Overconfidence: 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.
  • Sunk Cost Fallacy: 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 The Hero, 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!
  • Tautological Templar: 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.
  • Unwitting Pawn: Combined with People Puppets and You Are Already Dead. A demon took control of his corpse and instigated a civil war in the kingdom, for ends unknown.
  • Villain Has a Point: 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 refuses to believe it.
  • Villain with Good Publicity: 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.
  • What Could Possibly Go Wrong?: 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 The Hero there alone...
  • Wrong Genre Savvy: Since conquering the Haunted Forest is so difficult, there must be some great treasure there.

     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.

  • Axe-Crazy: Invoked and Literally. He is barely able to do anything but attack with wild abandon while he wields his cursed axe.
  • An Axe to Grind: He prefers war-axes as his Weapon of Choice.
  • Entertainingly Wrong: 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.
  • Godzilla Threshold: 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.
  • Informed Attribute: One of his skills is "Crisis Detection Lvl III" yet he goes and provokes a Demon Lord and Supreme Dragon Levy, even threatening the latter with gang-rape.
  • Mugging the Monster: 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 stalks and attacks him in an alley.
  • Nice Job Fixing It, Villain!: His threat to gang-rape Levy leads to Yuki finally spitting out his feelings for her, and her reciprocation.
  • Serial Rapist: When Yuki uses "analyze" on him, he finds a title proclaiming that he's exactly that.
  • Testosterone Poisoning: His entire frame had way too many muscles on it for his own good.
  • Too Dumb to Live: 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...

     Legillus 
An orhicalcum class adventurer Prince Ryuit hires to guard the castle gates.
  • Beat Still, My Heart: Yuki has to literally rip his heart out to stop him.
  • Blood Knight: He seeks out battles to the death, caring not a bit for context or situation.
  • Interplay of Sex and Violence: He gets sexual arousal from battles to the death, and orgasmic glee, win or lose.
  • Major Injury Underreaction: Combined with Made of Iron. A blow that takes out a major portion of his chest and abdomen isn't enough to stop him, or even slow him down.
  • Red Baron: "The War Freak."
  • Ultimate Job Security: 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.

Others

    Raylow Lurubia 
The mayor of the town of Alyfro.
  • Ignored Expert: 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. Then they have the gall to be shocked that he provides them absolutely zero support on their ventures that would easily destroy their country.
  • Know When to Fold 'Em: 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.
  • My Country, Right or Wrong: 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.
  • Nervous Wreck: 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.
  • Please Kill Me If It Satisfies You: When he sees Yuki and Lefy in his office a second time, he fully expected they were there to deliver Disproportionate Retribution 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.
  • Tall Poppy Syndrome: 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.
  • What Were You Thinking?: 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.
  • Wrong Genre Savvy: He fully expected Yuki and Lefy to go full-tilt Omnicidal Maniac 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.

     King Reiyd Glorrio Allysia 
The reigning monarch in the kingdom of Allysia.

  • Forced to Watch: 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 and saw it.
  • The Good King: 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.
  • It's All My Fault: Blames himself, entirely, for his eldest son's fate.
  • Reasonable Authority Figure: 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.
  • The So-Called Coward: 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.
  • Threat Backfire: 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 of a shocked Pikachu.
  • Uncertain Doom: He's officially gone missing. Nobody currently knows if he's alive or dead. He's later found imprisoned in the castle dungeons.

     Gamdia Roston 
Former commander of the Knight order, and the only commanding officer to survive the ill-conceived attack on Haunted Forest.
  • Cassandra Truth: He went to warn his superiors about how badly they were outmatched. He was ignored.
  • Know When to Fold 'Em: 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.
  • Screw This, I'm Outta Here!: He took his squad and retreated when given the chance. Said squad were the only survivors.
  • The So-Called Coward: 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.

     Carlotta 
The head of the church, and the one who trained Nell to be humanity's "Hero."
  • Asskicking Equals Authority: Strongest member of the church, even beating Nell, and its leader.
  • Awesome by Analysis: 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, because he values his freedom.
  • Beauty Equals Goodness: Physically attractive and morally upright.
  • The Chessmaster: While she is very benevolent, she does always have plans within plans going. This terrifies Yuki.
  • Entertainingly Wrong: Her assessment of Yuki and his motives is only right in one area, his character. In everything else, she's only marginally correct.
  • Friend to All Children: She runs an orphanage, in addition to her duties for the church. The kids all love her.
  • High Priest: Leads the church and is its strongest paladin.
  • If Only You Knew: 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.
  • La Résistance: She and the church are not keen on living under the rule of Prince Ryuit, and with good reason.
  • Magic Knight: Powerful knight, and priest.
  • A Mother to Her Men: Treasures her subordinates dearly.
  • Rousing Speech: She goes into one, in detail, as she prepares to deal with the Evil Prince.
  • Scarpia Ultimatum: 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...

     Princess Iryll 
The young daughter of King Reyid
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