Unmarked spoilers below.
ZaganAn 18-year-old mage (and, later, Archdemon) who inhabits the territory of Kianoides. In his youth, he was kidnapped by the mage Andras to be a Human Sacrifice. At that moment his latent magical ability awakened and he killed the mage, taking his place.
- Adorkable: He is strangely endearing precisely because of the awkwardness that comes from his atrophied social skills.
- Awesomeness by Analysis: One of his main skills. He has studied Magic so much he can usually figure out a way to destroy/reverse another Mage's magic circle before he can use the spell.
- Big Good: In the sense that his protection allows a lot of people to live in peace.Following her gaze, Nephys breath caught as well. Then [sic] calmly looking over the surroundings, everything had returned to normal, not just the crystalline spears but the destroyed properties now looked like nothing had happened and the people that had been pierced were just stunned and fallen backwards.
- Break His Heart to Save Him: To Nephy. When he's promoted to fill the empty Archdemon seat, he frees Nephy and sends her away, for fear the other Archdemons would kill her if he didn't.
- Brilliant, but Lazy: Zagan didn't seem to want immortality so much as he wanted a reason to seclude himself and calm down from his Traumatic Superpower Awakening. (He picked immortality specifically because it's what every other mage is studying.) It's not until he frees another slave that he realizes he can use his power to do things that really matter to him.
- But for Me, It Was Tuesday: Combined with Right for the Wrong Reasons. He rescues innocents who cross his property, not because it's the right thing to do, but because the evil idiots attacking them are annoying him in the process in one way or another. As such, he really doesn't care about them, at all, and doesn't remember it. Several merchants he's aided do nice things to him as a result, and it baffles him.
- Dark and Troubled Past: As a child, he was orphaned, forced to fend for himself in the slums, forced to steal enough to get by, and then was picked up as Human Resources by a mage. He became the mage Zagan by killing the bastard, in self-defense.
- Did Not Think This Through: Purchasing Nephy was all well and good, but he didn't even consider what he was going to do next, where she was going to live, etc.
- Doting Parent: He's this to Foll, wanting to give her a normal childhood that he or Nephy doesn't get.
- Horrifying Hero: Due to mages usually being evil, anytime he saved someone in the past they would usually flee in terror from him.
- The Magnificent: "Mage-Killer"
- Magnetic Hero: Averted. He is the focal point of the Orobas movement, but not because of his personality. It's just that Orobas doesn't have a base yet, so everyone in it squats in Zagan's giant, well-protected castle.
- Mean Boss: To everyone but Nephy. Working for Zagan means you get food, shelter, and protection from anyone who might be hunting you, or, if Zagan's in a very good mood, some of his spells. It does not mean you will be respected, or only given work you know how to do.
- No Social Skills: At the beginning he has absolutely no idea how to actually talk to Nephy, and everything he usually says comes out very wrong.
- Personality Powers: He has a gift for taking others' things- their money, goods, or even preconceptions- and using them to suit himself. Naturally, his unique magic centers around absorbing and repurposing other mages' spells.
- Sickening Sweethearts: So much so with Nephy that the two of them holding hands turns the entire fanbase into The Knights Who Say "Squee!"
- Squishy Wizard: Averted. He is able to break a blade with his bare hand and sends a guy twice his size in muscle with a Finger Poke of Doom.
- Street Urchin: In his childhood, he was a thief who had to steal to survive. His situation was so bad that he remembers prison fondly, because at least it provided food and shelter.
- Sure, Let's Go with That: He obviously can't tell Nephy the real reason why he bought her, so he stalls for time until she mentions that she can cook.
- You Kill It, You Bought It: He becomes a mage by killing the mage who tried to make him a Human Sacrifice.
Nephelia/"Nephy"The "slave elf" of the title. An albino ostracized by her fellow elves, she refused to protect them when slavers attacked their village. She was being delivered to the mage Marchosias when he died unexpectedly, so she was then auctioned off to Zagan.
- Accomplice by Inaction: She didn't destroy her village, but she could've easily saved it from the people who did.
- Anti-Hero: She's not malicious so much as she just doesn't care about morality. Anyone who attacks her family must die, regardless how of little choice they had in the matter.
- Because You Were Nice to Me: She was so shunned and jaded that Zagan, clearing out a room in his castle tower, by blowing up the previous owner's "collection" causes her to happily devote herself to him, body and soul.
- Berserk Button: DO NOT HARM ZAGAN!
- Clingy Jealous Girl: Displays this most clearly in the end of Volume 2 when Zagan starts getting friendly with Chastille.
- Death Seeker: The moment she came into Zagan's possession, the first words that came out of her mouth were questioning how he was going to kill her, and spouting various methods to carry it out. Zagain is properly horrified and has to constantly tell her he has no such intention.
- Expressive Ears: Zagan has noticed that her ears twitch when she is happy.
- Feminine Women Can Cook: She is a very good cook, usually making the meals both she and Zagan eat.
- Fountain of Youth: She was turned into a child in Volume 4.
- Gaia's Vengeance: Her Celestial mysticism means is that every part of nature in the vicinity tries to kill whatever poor bastard the sorcerer wants it too. Including inanimate vines. And baby animals. They're all locked into a vicious, merciless Hive Mind.
- Green Thumb:
- Morality Pet: Her existence, and the fact that Zagan genuinely loves her, though has a hard time showing it, makes him a better person.
- Murder Is the Best Solution: Usually played for laughs but she is very quick to suggest someone to be killed that is a problem for Zagan.
- Number Two: Zagan's default response to any question from his subordinates is, 'Why are you asking me this and not Nephy?'
- Personality Powers:
- Power Incontinence: When she uses her powers, she has little, if any, control over them. This is the primary reason she didn't protect her home village. The second reason is that they treated her quite cruelly beforehand...
- Property of Love: After Zagan comes to her rescue at the end of Volume 1, she presents her Slave Collar and asks him to put it back on, declaring herself to be his possession for life. He happily accepts.
- Sugar-and-Ice Personality: Cold and indifferent on one side, sweet and adoring on the other.
- Superpower Lottery: Being a high elf and an albino "cursed child", she was born with vast amounts of mana and the ability to use Celestial mysticism, which curbstomps normal magic.
- Swiss Army Tears: Her tears are able to heal the stab wound in Zagan's hand.
- The Heart: She is clearly the main reason Zagan has become a better person.
Valefor/"Foll"A hooded, mysterious mage who is revealed in Volume 2 to be a dragon child. She seeks revenge for her dead father, who she believes was killed by archangels.
- Happily Adopted: By Volume 3 she's officially Zagan's adoptive daughter.
- The Magnificent: "Apparition Valefor"
- Misplaced Retribution: She attempts to attack Chastille and later actually attacks Raphael since she believes they are responsible for her father's death. Only after the fight was over did Raphael reveal that her father died helping them fight off demons.
- Siblings Wanted: Having never been anybody's big anything, she votes to keep Nephy in her transformed childlike state in Volume 4.
- Tin Tyrant: Her initial appearance is this. Turns out she's animating most of the armor using magic; her head barely reaches up to the armor's helmet, let alone her eyes.
Raphael HyurandellAn Archangel who has killed hundreds of mages for the Church. After the events of Volume 2, he defects and takes up residence in Zagan's castle as a butler.
- An Arm and a Leg: He lost his left arm protecting Foll from the demon chimera. Foll later gives him a replacement using armor animated by her magic.
- Big Brother Instinct: Having been a friend of Foll's dad, he likes hanging out with her much as an uncle would his niece.
- Face of a Thug: This is one reason why he ended up killing so many mages: they just kept attacking him when he tried to talk to them (and recruit them into Orobas). The increasing killcount only makes things worse. It's the reason why he eventually entrusts Chastille with the role in the Unification faction, since she doesn't have a poor reputation hanging around her neck and has much better looks and social skills.
- Faking the Dead: He's officially declared dead by the church in order to become Zagan's butler.
- No Social Skills: He talks in a really intimidating fashion even when he's trying to be nice. Even worse, he grew up serving the very stern, fanatical Church, so his idea of how an authority figure 'should' act is warped.
- The Paragon Always Rebels: Spending his whole life killing mages only solidified his eventual conviction that killing mages doesn't solve anything, not to mention his issue of the Church using Child Soldiers.
BarbarosA neighbouring mage who likes visiting Zagan.
- All for Nothing: He does a bunch of kidnappings and tries to frame Zagan for it, purely to become the next Demon Lord, and then learns from Nephy that the Demon Lord council has already chosen Zagan.
- Bodyguard Crush: By Volume 6 he starts to fall in love with Chastille.
- Bodyguarding a Badass: Zagan assigned him to watch over Chastille who is in generally more than capable of handling herself.
- Casting a Shadow: Barbaros' speciality is manipulating shadows. He can even hide in someone's shadow, which is how normally he follows Chastille.
- Driven by Envy: He's always been jealous of Zagan's fame/infamy and success at being a mage. To the point that he'd frame Zagan for a bunch of kidnappings.
- Exhausted Eye Bags: All the time.
- Frame-Up: He frames Zagan for a bunch of kidnappings.
- Moment Killer: Ends up ruining Zagan and Nephy's near-kiss in Volume 2 since he barged into them carrying poisoned Chastille.
- Only Friend: Prior to Nephy entering Zagan's life, he was the only person in the world Zagan was even marginally friendly with.
- Person of Mass Destruction: In Volume 1, as powerful as Zagan is shown to be, Zagan often notes that if the two of them were to ever actually fight, even in his own territory, with the full-home field advantage, Zagan is not confident he could beat Barbaros. This effect is quite lessened after Zagan kicks his ass at the end of Volume 1.
- Sarcastic Devotee: After Zagan beats him, he's now this to Zagan.
- With Friends Like These...: He's the closest thing Zagan has to a friend in the beginning of the series, and is clearly not good for Zagan's continued well-being.
GremoryA mage Zagan meets during Bifrons' evening ball in Volume 3. After the ordeal in that volume, she joined Zagan's retinue.
- Bi the Way: She doesn't seem to have any problem with seducing women. In Volume 4 she would have gotten her way with Nephteros if Kimaris didn't stop her.
- Cute Witch: Her child form, where she uses to act adorable, ride on Kimaris' shoulder, and recover from her old form's back pain.
- Dual Age Modes: She normally use her magic to shift between 3 forms: her child form, adult form, and default old form.
- Horned Humanoid: She has a pair of goat horns.
- Hot Witch: Her adult form. Perfect form for seduction, it's also a form she uses when she needs high stamina.
- Love Freak: She really likes to talk about "love power". Her teacher Orias is quite embarassed by it.
- Shipper on Deck: She absolutely ships Zagan/Nephy. She's also helping them advancing their relationship.
- Sinister Scythe: She wields one as a weapon.
- Witch Classic: Her default form. She uses this mainly because more age = more power.
- Beast Man: He normally has a face of a lion.
Ainselph Thalasa Neptuna/"Selphy"A Siren singer who was hired by Bifrons in Volume 3. After the ordeal there and Manuela's advice she joined Zagan's household as a servant. She's also a Siren princess.
- No Name Given: She wasn't named at all in Volume 3, only named herself in Volume 4 after complaining that no one remembers her name. Her full name is only revealed in Volume 6.
- Rebellious Princess: She ran away from her home since she disagrees with the fact that royal songs are considered sacred and should only be heard by a few, so she ran and become a singer, to share her talent to the world.
- Took a Level in Badass: She went from a noncombatant comic relief into a powerful combatant after she received a Holy Treasure in Volume 6, using it to help Lilith, Kuroka, Nephteros, and others fighting off Demon Lord sludge possessing Foll.
- Valley Girl: She speaks like this, which is surprising considering that she's a princess.
ManuelaA shopkeeper who befriends Nephy.
- Big Sister Instinct: The moment it looked like a Holy Knight came to kill Nephy (A complete misunderstanding). She didn't hesitate to jump in front of Nephy to protect her.
- Cool Big Sis: She acts like this to Nephy, even referring to herself as a big sister at one point.
- Cosplay Otaku Girl: One of her favorite things to do is to dress up cute girls in very sexy outfits. Nephy happens to be one of her regular, so she likes to do this to her. By Volume 6, even Zagan's not an exception.
- The Gadfly: To Chastille.
- I'm Taking Her Home with Me!: She tried to do this to Foll after she made an outfit for her.
- Our Angels Are Different: Aside from having Angel wings, she doesn't seem to be any different from a normal human.
KuuA therianthrope Zagan rescued from slavers along with Kuroka. After the events of Volume 5 she ends up working for Manuela.
Chastille LilqvistA renowned Archangel and bearer of the sword Azrael. Her refusal to kill Zagan got her excommunicated from the order.
- All Love Is Unrequited: By Volume 5 she finally realizes that she has unrequited crush on Zagan. The fact that she knew he won't reciprocate eventually ends up with her forming Romantic Two-Girl Friendship with Nephteros after realizing just how Nephteros is surprisingly in a similar situation as Zagan, and not wanting to be unable to act on her feelings again.
- Butt-Monkey: Her life gets worse in practically every scene she's in. You can't really blame the poor girl for being a crybaby.
- Drama-Preserving Handicap: If she could utilize her Sword's full potential, Zagan would be dead. Fortunately, to do so a wielder must believe fully in their cause, and Chastille has doubts about the morality of killing someone who saved her life once. Volume 2 and beyond shows how capable can she be when not burdened.
- Improbable Age: Deemed worthy of bearing a Holy Sword at 17.
- Internal Reformist: In Volume 2, She vows to follow Raphael's wish for the Unification faction in bringing the Church and mages together into Orobas and stand against demons, and make the Church a better organization.
- I Owe You My Life: Zagan saves her life, not knowing who she is, in the first chapter. She eventually realizes that she cannot both repay this debt and remain loyal to her masters.
- Just Following Orders: If she doesn't go through with assassinating a target, she could be tortured and executed by the Church. She tries to get around this by asking Zagan to fake his death, but he refuses.
- Knight in Shining Armor: Her conflict comes from her being a real paladin in an era where they're expected to be murderous, unquestioning figureheads for the people who are really in charge.
- O.O.C. Is Serious Business: While normally a crybaby, she is absolutely serious when on the job. The fact that the main characters never really sees her being serious before means that when they're trapped inside Nephy's hometown in Volume 4, she deems the situation serious enough to put on her game face for extended period of time, surprising everyone there, especially given that the others are starting to act a bit silly compared to her. The effect's toned down later on when the group's more used to this side of hers.
- Skilled, but Naïve: She's possibly one of the most powerful Archangel (as long as she can put her mind into it, see Drama-Preserving Handicap) who could possibly even defeat Zagan as Archdemon, but she's hopelessly naive when it comes to trusting people and politics. It ends up with her being poisoned by Clavwell, since while she suspected him, she doesn't want to believe it.
- You Gotta Have Blue Hair: Bright bubblegum pink.
Kuroka AdelhideA blind tabaxi priest who is revealed to be a Church assassin and secret Archangel. Wielder of the 13th sacred sword Azazel. She's also Raphael's adoptive daughter.
- Blind Weaponmaster: Her being blind doesn't reduce her combat capability in the slightest.
- Fantastic Racism: Due to her upbringing by Raphael, she will not use her sword against peoplenote , however mages and Church traitors/mage collaborators doesn't count in her eyes, especially given that mages are responsible for her loss of sight. She starts toning this down after Raphael is revealed to be alive: while she's still wary of mages in general, she makes exceptions for Zagan and Nephteros.
- Little Bit Beastly: As a tabaxi, she has cat ears and 2 tails.
- Misplaced Retribution: Bifrons manipulated her into thinking that Chastille killed Raphael to get her to kill Chastille.
- Uniformity Exception: Azazel is the only sword that is not a BFS, instead it takes form of a shortsword.
NephterosA splitting image of Nephy, Nephteros is a dark elf who looks pretty much exactly like Nephy, but with darker skin, and wields the same power as her. Originally Bifrons' servant, she eventually escapes and ends up living with Chastille as her unofficial aide.
- Affectionate Nickname: By Volume 6 she starts calling Zagan "Big Bro" since he's now her brother-in-law.
- Cloning Blues: Orias revealed that she is Nephy's clone created by Bifrons, which becomes the reason why she ran away from Bifrons. In the end it's resolved by having Nephy and Orias accepting her as part of the family.
- Driven by Envy: She initially tries to kill Nephy due to being envious of how happy Nephy is with Zagan.
- Good with Numbers: After moving in with Chastille, she ends up becoming the Church branch's unofficial accountant and trying to keep the balance book in the black.
- Our Homunculi Are Different: Her nature as a clone means she's a homunculus. She cannot survive long without being supplied by mana regularly.
- Romantic Two-Girl Friendship: Ends up forming one with Chastille after the latter decides to take her in. Chastille's also the only person Nephteros will honestly reveals her feelings to instead of her usual tsundere self.
- Spot the Imposter: Her impersonation of Nephy would be perfect if not for the fact that Zagan is way more intimate about Nephy's subtle expressions that Nephteros doesn't know.
- Stripperiffic: Her regular outfit is a lot more revealing than Nephy's.
- Superpower Lottery: Slightly Downplayed: She isn't as powerful in Celestial mysticism as Nephy due to her being Nephy's clone, the process that lowers her general power level, but she has a lot more experience. She's also a highly skilled mage, with power level just below that of Archdemons.
- Tsundere: She has problem expressing emotion and can becomes tsundere when confronted or just trying to convey her feelings. It's betrayed by her Expressive Ears, however.
BifronsThe youngest Archdemon before Zagan, heavily interested in study of Celestian. He's the one who instigate the attack on Nephy's village, partly setting the plot into motion.
- Cruel Mercy: After Zagan finally caught up with him in Volume 5, Zagan loads Heaven's Phosphor into Bifrons' heart and set it so that it would detonate if he tries to interact with or even showing himself to Nephteros again. An extremely cruel mercy given how much he loved Nephteros, even if he didn't realize it himself.
- Demonic Possession: One of his favorite tactic is to posses people and use them to sow discord.
- Doomed Hometown: He's the one who razed Nephy's village in the attempt to capture her.
OriasOne of the Archdemons. She also turns out to be Nephy's mother Titania and thus by extension Nephteros' mother.
- Legacy Character: The current Orias is actually Titania, after she defeated original Orias and stole her identity.
- Superpower Lottery: Like her daughters, she's capable of wielding Celestial mysticism, and she's Archdemon-tier mage.
- Well-Intentioned Extremist: She locks up Zagan's group in Nephy's hometown and transform Nephy into a child in order for Nephy to not have a horrible childhood memory she has to endure and live happily.