A mysterious undead boy seeking revenge on Nex for the destruction of his village. He heavily implied to be Nex and Serin's long-lost son, although given the evidence surrounding another character being Nex and Serin's child as well, nothing is confirmed.
Triang Relations: Was in a Type 4 as a child with himself as B, Siana as C, and a girl named Linne as A. He's in a Type 10 in the present with Yuan as A, himself as B, and Siana (or at least his devotion to her memory) as C, and a Type 6 with Viryuna as A, himself as B, and Yuan as C.
The Undead: Siana is the necromancer who raised him from the dead, and it is only in rare cases an undead can survive without their necromancer's blood. Since Xix literally stole Siana's heart, it seems likely this is how he survives. Oski seems to know and hints towards this in earlier chapters.
The Worf Effect: Despite advancing leaps and bounds in his Taeguk training, he's easily defeated by Prince Ninurta.
The Crown Prince of Chaos, Ninurta is somewhat aloof but good-natured, and desires above all the approval of his father Nex, who he bears no resemblance to - leading to rumours that he is illegitimate. It turns out he actually may be the son of Iffrita and Mikhail Noah, although he didn't know it until the events of the story revealed this to him and others. He is later captured by Siana and taken to the Clan of the Night. His status as Nex's son is also debatable despite earlier revelations, as Just seemed to be able to successfully use his blood for an inheritance ritual, he has not been infected by Caladbolg's curse when only Night Clan are immune, and that later on a girl who resembled his mother appears. Thus it is possible he is actually Nex's son after all.
Foil: Serves as one to Xix. Whereas Xix used to do the right thing for the 'wrong' reason (Saving Miya so he can use her as a hostage), Ninurta now finds himself doing the wrong things for the 'right' reasons (Betray his father to save his mother).
The princess of the Serpent Clan and Ninurta's fiancée. She meets Xix when he attacks her caravan thinking it was Nex's, and despite the two being hostile towards each other they quickly become close friends and then some.
All Girls Want Bad Boys: Xix was definitely the 'Bad Boy' to her at their first initial meeting and yet she couldn't keep him out of her thoughts even though she was meeting with her future husband. Since then, Xix has drastically turned from being a revenge-driven maniac to a Jerk with a Heart of Gold.
Lately, he's dropped most of the 'jerk' facade too, especially around Yuan.
Arranged Marriage: With Ninurta, though it falls through after Xix and the Night Clan attack.
Badass Princess: Daughter of Yongje Yeonoh, Head of the Serpent Clan and a powerful magician in her own right.
The supposed son of Nex and Serin, he is actually a human undead with a false personality commissioned by Navarus, Serin's father, in in a ploy to unseal his daughter. He was contracted to the snake demon Ouroboros by Oski in an effort to stop a rampaging Xix, and also takes sadistic pleasure in tormenting Ninoorut.
Anti-Hero: For the time being. With the revelation that Xix may be Serin's son, Navarus has asked (Ordered?) Just to keep him safe, though Just, or rather Ouroboros, has his own reasons for doing so.
Chessmaster Sidekick: He seems mostly harmless outside of one of his end goals being to see Calabolg's power released so that he can battle Nex and using things like Xix's contract and feelings to do it.
Deal with the Devil: Loves doing this. He strictly abides by the rules of his contracts, although he never breaks a promise to his contractees - as when Xix begs him to save Yuan, Oski - despite having openly flirted with Yuan in the past - refuses due to it not being part of Xix's original contract and says that Xix would likely have to sacrifice his remaining life-force in a second contract to heal her.
Sissy Villain: For a powerful sorcerer he seems pretty weak compare others, and he gets the title of villain because it is revealed early on his goal is to enable the Night Clan to free Caladbolg's power in order to see another bout between Caladbolg and Nex.
Smug Smiler: Is supremely overconfident both in his powers and his ability with women.
Death by Materialism: Averted: Had he followed his initial instincts to search for some money he heard someone drop in the park, he might not have wandered into Serin's fight and been turned into a Undead in the beginning of Immortal Regis.
Incest Subtext: Incredibly devoted to his little brother Jae-Hoon, and even confirms that he has more love and desire for his brother over Serin, the woman he is obsessed with.
Knight Templar: One of Nex's defining traits. Most of what he does are Necessary Evils, but he tends to use extreme force right off the bat. He was much nicer and more reasonable in the past, but whatever happened between him and Serin pushed him to the point where he stopped caring.
Papa Wolf: Towards his daughter, Miya but is apathetic towards his sons.
Likely because he knows that Ninurta and Just are not his sons. As for Xix... well, there's way too much bad blood between them for there to be much affection.
Pet the Dog: The only ones he displays genuine affection towards are Diffor and his daughter Miya.
He's also starts to show a little more.. restraint... when dealing with Xix, even though the boy openly defied him, and has made it quite clear he intends to continue doing so. Granted, this just means that Nex has postponed chopping his head off so he can focus on other matters, but that's a hell of a lot more tolerance than he's shown in the past. That and the boy is an Undead, like himself.
Nex's first wife and partner from Immortal Regis, and a skilled Necromancer. She is currently imprisoned in an eternal nightmare for supposedly betraying Nex, but not before giving birth to a child, who is revealed in one character's flashback to be Xix and in another flashback she mentions Siana being her daughter, leaving open questions who or how many she had before capture.
The Atoner: Sought to sacrifice herself to atone for turning accidentally Jae Hoon into Caladbolg.
Dark Magical Girl: Subverted hard. While she does have the look and title, being a Necromancer from the House of Demon, she is one of the most selfless characters in the entire story. She's also regarded as being the strongest magician left in Chaos.
Death by Irony: Narrowly avoids this courtesy of Iffrita, as Nex refused to execute her.
Determinator: By virtue of being The Atoner, she actually became one of the five pillars that supported Chaos's very existence in the absence of Diffor's magic stone, which was being used by Jae Hyuk. Even her rival from another clan came to respect her sheer willpower and mental fortitude to withstand the enormous drain on both her magic and body for three years.
Another was that while she was being used as a replacement for Diffor's magic stone, she was also having a portion of her blood drained every three days and sent to Jae-Hyuk since Undead technically need their master's blood to keep functioning.
Nex's daughter with Iffrita, Miya is a sickly child who needs doses of her father's blood to stay alive. She encounters Xix after having run away from the palace, and befriends him. Xix's efforts to rescue her when she was abducted by members of the Clan of the Night, coupled with the fact that his blood could heal her, convinced Nex to spare him. Out of all Nex's possible offspring, Miya is the only one he expresses genuine affection towards.
Shipper on Deck: Xix and Yuan, although her annoyed expression in Chapter 78 may suggest otherwise.
Token Mini-Moe: The shortest and youngest-looking of the main characters.
The Unfavourite: To her mother, who neglects her in favour of her older half-brother.
The princess of the Noah clan, second wife of Nex, and mother of Ninurta and Miya. She first met Jae-Hyuk when he rescued her from falling while trying to retrieve her beloved, deceased mother's pendant and fell in love with him right away. Despite claiming to support Jae-Hyuk's love for Serin, she slept with her cousin Mikhail in order to bribe him to make it appear Serin betrayed Jae Hyuk and married him herself. She cares little for her sickly daughter, but is obsessed with getting Nex to name Ninurta as his successor. Following Ninurta's abduction Nex places her under house arrest and later plans to have her executed.
Xix's childhood friend and possible sister, and definitely Necromancer, who was killed by Nex's troops. She found Caladbolg injured after a fight with Nex and nursed him back to health. Caladbolg's presence infected the surrounding landscape and tainted a girl from her village named Linne, resulting in Nex ordering the massacre of her entire village. She reappears as a member of the Clan of the Night, attacking the capital and abducting Prince Ninurta on accident. She calls Caladbolg her uncle and is utterly dedicated to him, to the point of blindly charging into enemy territory, where she is captured and tortured by Ouroboros.
Incest Subtext: Her relationship with Caladbolg, which has even been questioned by Ninurta when it appears Caladbolg treats her as more than just a subordinate. Plus, the relationships with Ninurta, Just and Xix, considering the whole potential of blood or adoption relations there.
Missing Mom: Her mother was stated to have died in childbirth, one of the reasons she was shunned by her hometown.
Her mother is revealed to be Serin in Chapter 66.
My God, What Have I Done?: When Yuan's mother acts on her conflicted feelings towards Xix by trying to kill him and hitting Yuan instead, Siana is horrified and convinces Cal to postpone saving his mother to heal her... which backfires again when Yuan's mother attacks them again.
Necromancer: She remembered the spell Serin recited the night she left the child with the woman who would become her grandmother.
Her summoning of Yuan's mother to navigate Caladbolg's seal to reach Ninurta's mother before her execution caused her to be Empathic Weapon who acting on her conflicted feelings toward Xix tried to kill him and instead mortally wounded Yuan instead.
She Is All Grown Up: Her real body is certainly more... developed than her spare body, though not to the extent of other female characters.
Stripperiffic: Wears a hoodie, a black bra, and short shorts in the present.
The Undead: Was mortally wounded by Nex's soldiers and killed by Xix.
You Don't Look Like You: When Xix has a flashback to Siana's death in the first chapter she has developed breasts, but during the flashback arc that shows exactly how she died she was flat as a board. Also applies to her current body, which has black hair, to her real body, which is much older in appearance and has white hair.
Walking Spoiler: Just take a look at how many spoilers she has in this entry.
The Big Bad and God of Chaos. Has a long history with Nex, as his host body is Nex's little brother from Immortal Regis, Jae-Hoon. It is not clear how much power Caladbolg has over Jae-Hoon, as the personalities really do seem to have fused together. Leader of the Clan of the Night and uncle of Siana. From chapter 67 it appears that Jae-Hoon is the personality largely in control, and the corruption he brings to Chaos is a curse out of his control because it is Caladbolg underneath basically lashing out any way he can..
A Father to His Men: In contrast to hisbrother, Caladbolg considers throwing all his plans out the window in order to rescue Siana. Granted, it could just be a ploy to get Ninurta to join the Clan of the Night. If so, it worked.
Affably Evil: Seems to still be kind to those he is invested in for one reason or another, even during or after morally questionable acts.
Becoming the Mask: Caladbolg seems to genuinely believe it is Jae-Hoon. Unfortunately, Nex does not share the same sentiments.
The Corruption: His power taints everything he touches in Chaos. This is due to Caladbolg lashing out in whatever way he can when it appears Jae-Hoon is the personality largely in control. It makes him responsible for the destruction of Xix's hometown as his very presence mutated the landscape, alerting Nex to his presence in the area, and he accidentally corrupted a girl named Linne.
Cute and Psycho: What tends to happen when you seal an evil god inside a child.
Founder of the Kingdom: Even if it is not completely true, Caladbolg is considered the first true ruler of Chaos and its God. Considering the majority of Chaos has been created from Caladbolg's efforts and is thus under his influence, he has the power to back such a myth up.
Incest Subtext: Considering how jealous he of Serin for Nex's affections... not to mention his relationship with Siana, which has even been questioned by Ninurta when it appears Caladbolg treats her as more than just a subordinate.
Living Weapon: Like Diffor, Caladbolg is technically an extremely powerful, sentient weapon. However, its method of doing things include possessing a host, making them into the new King of Chaos with all these nifty new powers.