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Main Characters
Father / "Mr. Priest"
The world's strongest exorcist and the "Child of Hope" the Church believes to be destined to exorcize Satan. He has the unique power to amplify his miracles to rival that of God and his archangels, but his experiences and troubled upbringing leave him emotionally and socially stunted.
- Afraid of Their Own Strength: Father is afraid of socializing with other people his age because he feels he's a Doom Magnet whose strength will kill, directly or indirectly, anyone he tries to get close to. He gets flashbacks to Leviathan's struggles with not crushing everyone she meets while grappling with his feelings on the matter.
- All of the Other Reindeer: Father was socially isolated as a child. The other orphans as the monastery bullied him for being more powerful than them as an exorcist, the abbots and nuns literally beat the teachings of God into him by whipping and starving him, and he was exclusively referred to as an "abandoned mutt", "it", and a "thing" put on Earth to defeat Satan. It's little wonder that he became a Death Seeker who wanted to be martyred and go to Heaven to escape the misery he found on Earth until Dante shows him compassion and teaches Father to love the world God created.
- Animals Hate Him: People and animals instinctively fear Father, with most giving him a wide berth wherever he goes. Even fish will swim anywhere but in his general vicinity when all he's doing is looking at them. His bed is covered in animal plushies because the real thing would simply flee in his presence. After leveling a school in his rampage against Asmodeus, he freaks out when the school's bunny rabbits approach him because he fears he'll kill it by accident. When one of those rabbits snuggles against his leg, he drops to his knees and tearfully asks why it and everyone else doesn't hate him for what he did.
- Black Eyes of Crazy: When Father has had his Trauma Button pushed, his brow furrows and he starts bleeding from behind his right eye. The resulting shadows seemingly dye his eyes black, illustrating just how lost to rage he is.
- Blessing: Father is said to possess the ability of "Miracle Amplification", making the miracles he wields as powerful as God's. The pope sees this power as a blessing bestowed by God to his champion that will deliver mankind from the threat of the demon lords of Hell.
- Broken Ace:
- Father was chosen by God to be the most powerful exorcist in the world. He has successfully repelled several members of the Demon Lords of Hell, saving the world time and again in the process. But Father was abandoned by his parents at a church in Northern Italy and ostracized for it. Once the clergy realized his potential, he was molded into humanity's savior through terrible abuse and Training from Hell to be used as a Tyke-Bomb against Satan. This and the pressure of saving humanity repeatedly from Eldritch Abominations has left him Covered in Scars, with a Paralyzing Fear of Sexuality, and No Social Skills. He was also a Death Seeker desperate to martyr himself to reach Heaven faster because of how miserable he was before Dante gets to him. Some in the Vatican fear that Father's potentially unstable mental health could lead him down the path of apostasy if left unchecked.
- When Father has a breakdown after Asmodeus nearly rapes him again, the Roman Catholic Church scrambles to take him out of the public eye and attend to his mental health. However, Dante notes that they're looking after Father's welfare explicitly so he's stable enough to send back into the field and fight demons, something the other priests do not deny, as Father is the only one strong enough to take the Demon Lords head-on.
- Brooding Boy, Gentle Girl: Father is the brooding boy to Imuri's gentle girl. Father is a deeply traumatized Child Soldier Church Militant whose life has left him socially withdrawn but yearning to understand "love". Imuri is a succubus from Hell who acts as The Defroster for him, getting him to slowly open up to her and offering warmth and companionship.
- Celibate Hero: As an ordained priest, Father is explicitly forbidden from entering a relationship. But Dante encourages Father to fall in love with someone so he can love the world God created. This leaves Father deeply curious about love while simultaneously being sworn not to pursue it.
- Child Soldier: Father has been capable of using the most powerful miracles known to the Church and call upon the power of the archangels by the time he turned twelve, indicating that he'd been fighting as an exorcist at an even younger age than that. But his experiences have turned him into a socially stunted Shell-Shocked Veteran who has nightmares about his battles with the Demon Lords.
- The Chosen One: Father is a uniquely powerful exorcist declared by the pope to have been chosen by God himself to exorcize Satan. His "Miracle Amplification" ability lets him recreate any of God's miracles from the Bible and enables him to go toe-to-toe with the Demon Lords of Hell single-handedly. As a result, the Vatican repeatedly refers to him as the "Child of Hope" destined to deliver them from the demonic threat. But this is also Deconstructed, as this position puts enormous pressure on Father's shoulders and completely deprived him of a normal life. Being constantly sent against the forces of Hell and forced to suffer for the sake of others has left him with lasting trauma and severe mental issues.
- Clueless Chick-Magnet: Father unwittingly catches the attention of numerous girls around him, including Imuri, who was specifically tasked with seducing him, and Leah, who has an unrequited crush on him for swearing to take on her burdens for her when fighting Beelzebub. But his lack of social skills makes it difficult for him to recognize those feelings and he's sworn to celibacy as a priest of the Catholic Church.
- Covert Pervert: Played for Drama. Despite vowing to abstain from sex, he starts to get lewd thoughts about Imuri that lead him to masturbate despite his initial attempts to resist the urge to do so. Seeing what he's done leads him to grow disgusted with himself as Asmodeus takes satisfaction in Father succumbing to the lust. Due his trauma and suppressing himself his whole life, Father struggles to get these thoughts out of his head once he starts having them, leaving him incapable of functioning around Imuri.
- Dark Messiah: Discussed. The pope believes that Father is The Chosen One destined to deliver humanity from the demonic threat. But more cynical members of the clergy notice Father's unstable mental health from his abusive upbringing and the psychological damage he suffers from fighting the Demon Lords at such a young age. They fear that he could fall into apostasy and end the world if he were somehow tempted into losing faith in God.
- Death Seeker: When Dante meets him, Father is desperate to martyr himself fighting demons on behalf of the Vatican because he doesn't know anything else. He was an outcast among children his own age, abused and weaponized by the people supposed to care for him, and thrust against one demon after another, leaving him miserable and purposeless beyond his capacity as a demon-killing weapon. He felt that his only release was to die and find happiness in Heaven after exorcizing as many demons as he can. It's not until Dante shows him compassion and tells him to find people he truly loves that Father tries to comprehend love and loses his martyr complex.
- Embarrassing Hobby: Father initially insists that he knows how to cook due to handling chores around the monastery, but he later admits to Imuri that he's much more comfortable in a kitchen than on a battlefield. Were it up to him, he'd likely spend all day baking sweets to make others happy, but is afraid of revealing this to others because it wouldn't seem "manly".
- Everyone Calls Him "Barkeep": Father has a name and it's apparently used on documentation, but he's only ever referred to by his title or as "Mr. Priest" by his co-workers. Even when placed into a high school setting while guarding the pop singer Aria, he's never referred to by name.
- Everyone Can See It: When thrust into a high school setting for the sake of guarding the singer Aria from Asmodeus, all of the students can see that Father is clearly interested in Imuri by how happy they are to be around each other. But he insists they're not dating and is sworn to celibacy as a priest.
- Good Old Fisticuffs: Against demons lesser than a Demon Lord, Father can usually beat them into submission with nothing but his bare fists, going through an entire squad of fallen angels with minimal effort. He and Mammon also go at each other with their fists in a brutal brawl after they exhausted the rest of their powers.
- Good Thing You Can Heal: Father can rapidly heal himself from damage that would normally result in lethal injuries for anyone else. This is repeatedly displayed in battle when he's forced to contend with one of the Demon Lords, who are each a Person of Mass Destruction and a Physical God who would kill anyone else in a single fight. Blocking Mammon's Kill Sat attack flays all the skin off Father's right arm. Later on, all the flesh on Father's legs is incinerated by Leviathan's Wave-Motion Gun. Father had it even worse in his first fight with Beelzebub, where the priest is shorn in half with his remaining eye gouged out and ribs exposed. In his second fight with Beelzebub, Father has his liver ripped out, is doused in corrosive acid, is crucified, and then hacked into ribbons with a fork and knife. Even then, Father is able to use his miracles to heal himself and continue fighting.
- Heroes Prefer Swords: One of Father's most frequently used miracles is the creation of a sword made out of holy energy based on Matthew 10:34: "Think not that I am come to send peace on Earth. I came not to send peace but a sword." It's powerful enough to slice Mammon's arm off before he can react, but it fails against Leviathan's hide.
- Honor Before Reason: Father's compassion and sense of honor means that he gives Imuri a lot of leeway regarding her living conditions even though it makes his job of protecting her harder. A letter written by the Vatican actively complains that Father made the unilateral decision to let her move back to Japan instead of keeping her under surveillance in Rome or in a special facility under the sea where she'd be confined and contained.
- I Just Want to Be Normal: While Father handles his duties with care, he admits to Imuri that he'd much rather be cooking in a kitchen than fighting demons on a battlefield. Asmodeus is aware of this and draws him into school to give him a taste of the normal life he craves, bringing him closer to her under her human guise as Aria.
- Improbable Age: At 16 years old, Father is a "Grand Priest" and is thus referred to as "Father" even though the canonical age for priesthood is 25 years old. He's constantly referred to as "Little Father", "Mr. Priest", "Priestie", or "Father-kun" in a cutesy way because of this.
- Inelegant Blubbering: At the end of Chapter 53, Father is reduced to unintelligible sobbing after venting his anger and fear of Asmodeus against her. Mikhail remarks that it's the first time he's seen Father throwing a tantrum and that Father has finally learned to share how he feels to others.
- Innocently Insensitive: When Imuri gains weight from her Sweet Tooth, she asks him if she's gotten fat. Unsure of what to say, he takes Barbara's advice to treat her as if nothing has changed by telling Imuri that yes, she has gotten fat, but that won't change how he treats her. While Imuri understands what he tries to say on a logical level, it still pisses her off and he apologizes while clearly perplexed about what he should have said.
- "It" Is Dehumanizing: As a child, Father was repeatedly referred to as an "it" or a "thing" put on Earth to defeat Satan. This dehumanization and his subsequent abuse by Abbot Nicholas has left Father socially stunted and completely incapable of telling people's faces apart.
- Lonely at the Top: Father's overwhelming power and constant encounters with demons as an exorcist make him feel isolated and lonely. While this is somewhat mitigated by the presence of Leah and Barbara, Father remains anxious when trying to get close to others out of fear of hurting them directly or indirectly. He also struggles to open up about his feelings and traumas because of his status as The Chosen One, as he feels he can't show weakness as "the strongest". These complexes leave him struggling to get closer to Imuri despite enjoying her presence.
- Love Is a Weakness: According to Beelzebub, Father is weaker compared to their previous bout, and it's implied that Father's growing closeness to Imuri is making him emotionally vulnerable. This is why Mammon's fallen angels can crack Father's barrier so easily. Beelzebub is shown to be right when Father is nearly raped by Asmodeus a second time. Father snaps from having his Trauma Button pushed so hard, becoming exponentially more powerful and thrashing Asmodeus when she'd previously repelled him with ease.
- Masturbation Means Sexual Frustration: Played for Drama. After almost getting raped by Asmodeus a second time, Father starts to get lewd thoughts about Imuri in his sleep. Despite trying to get his mind off it and finding a better way, he ultimately succumbs to the temptation to masturbate in his bed. Seeing what he's done despite vowing to abstain from sex leads Father to grow disgusted with himself, and Asmodeus takes satisfaction in Father succumbing to lust.
- Mood-Swinger: After being nearly raped by Asmodeus a second time, Father snaps and goes on a rampage. During this time, he swings between wearing a Slasher Smile while pounding his foe into a bloody mess, tears of sorrow and fear, childlike amazement at how bright and colorful the world is, and disturbing apathy about the value of others' lives if he can just revive them afterward.
- No Social Skills: As a Child Soldier and a Shell-Shocked Veteran, Father is socially stunted and withdrawn. He addresses all questions with Brutal Honesty because the Bible frowns upon telling lies, struggles with how to speak to Imuri without offending her, and has no concept of what it means to be "cute". Leah and Barbara regularly lecture Father on his lack of tact and he sweats bullets when he accidentally commits social faux pas. It's later revealed that Father's abusive childhood renders him incapable of telling faces apart. Everyone appears as a cancerous, vaguely featured blob due to the enormity of his trauma. This is why he can't understand "cuteness", as everything and everyone looks like a twisted soul in Gehenna.
- Not So Stoic: As the strongest exorcist, Father believes that he can't show weakness and must maintain his composure at all times. He bottles up his trauma and feelings to an unhealthy extent, inhibiting his attempts to understand love and get closer to others. This comes to a head when Asmodeus tries to rape him again, an experience so traumatic that Father loses it and goes on a Mood-Swinger rampage.
- Paralyzing Fear of Sexuality: Played for Drama. Father is terrified of the naked female form after nearly being raped by dozens of women controlled by Asmodeus when he was twelve years old. He bleeds from his right eye and feels physically ill when he sees naked women while having PTSD-induced flashbacks to his near-rape experience.
- Person of Mass Destruction:
- Father is the most powerful exorcist in the world and one of the only exorcists capable of contending with a Demon Lord's power. He's able to recreate events as destructive as the Plagues of Egypt that God brought down to punish Ramses II for enslaving Jewish people as described in the Old Testament.
- Later chapters reveal that this is but a fraction of his full potential. After being pushed to the breaking point by Asmodeus trying to rape him a second time, Father levels a high school campus with a single blow, reducing the building he's standing into dust. While rampaging against his foe, Father's stomps are mistaken for earthquakes and he believes he could reduce a city to ashes with a flick of his wrist. Even then, Father hadn't lost himself completely to his rage and was merely venting his pent-up anger and sorrow, as his actions did not harm a single human being. Mikhail speculates that if Father truly succumbed to his rage, it would likely be The End of the World as We Know It.
- Sacrificed Basic Skill for Awesome Training: Father was put through torture and Training from Hell to be a living weapon against the Demon Lords of Gehenna. He's extremely competent as a fighter and a housekeeper, but is otherwise underdeveloped socially and has severe mental issues. He can't lie, does not understand what it means to be "cute", and has never had a long-term friendship with anyone outside of the church.
- Sex Is Evil, and I Am Horny: Played for Drama. Despite vowing to abstain from sex, show revulsion to those who sexually exploit people, and having a Paralyzing Fear of Sexuality, he starts getting lewd thoughts about Imuri that lead him to masturbate when he can't resist the temptation for long. The irony is not lost on Father and he grows disgusted with himself. Asmodeus, despite failing to rape Father a second time and getting banished, takes satisfaction in Father succumbing to lust.
- Shell-Shocked Veteran: Father is explicitly diagnosed with PTSD from being nearly raped by Asmodeus when he was twelve years old. He has a perpetual Thousand-Yard Stare even when he's in a good mental state and becomes physically ill when exposed to things that remind him of his traumatic experiences. He's also shown to have nightmares of being Eaten Alive by Beelzebub's insects while crying Tears of Fear and begging for someone to help him. His bed is filled with plush animals for comfort and he's socially stunted from being used as a Child Soldier Church Militant with nothing resembling a normal childhood.
- Showy Invincible Hero: Subverted. Father is hyped up by the younger members of the clergy as an utterly invincible hero and unparalleled prodigy who defeated three Demon Lords on his lonesome. When Imuri brings this up, Father clarifies that he didn't "defeat" them so much as "repel" them, convincing them to cut their losses and return to Gehenna rather than slaying them permanently. This is especially noticeable in his first battle with Beelzebub, as Father had been utterly defeated by being cut in half and losing his remaining eye. Beelzebub simply turned around and left of his own accord.
- Socially Awkward Hero: Father is bar none the most powerful and skillful exorcist alive, but his abusive upbringing and adherence to the tenets of the Bible make him socially inept. He will not tell a lie due to the tenet, "Thou shalt not bear false witness against thy neighbor." and treats every conversation with Brutal Honesty even when a white lie would be less offensive. He also struggles to grasp social cues and has to be lectured on when he causes others offense. He squirms when he has to attend a virtual meeting of the highest ranking exorcists in the world and panics when trying to figure out if something is cute or not.
- Spider-Sense: Father has a finely honed ability to detect malice and ill-intent from others. But given that the demons often run on Blue-and-Orange Morality, it doesn't always trigger unless the demons are already actively trying to kill someone. He also gets chills when Mammon decides to introduce himself by recreating the attack that destroyed Sodom and Gomorrah above the same city that Father and Imuri are staying in.
- Supernatural Sensitivity: Father's sensory ability is so profound that he can scout out an entire town from the inside of a hotel room, though extremely weak demons with little to no magical power like Imuri as well as powerful demons like the Demon Lords can mask their energy to remain beneath his notice.
- Supreme Chef: Father is passionate about his cooking hobby and is capable of cooking a wide variety of delicious meals and complex sweets between battles. He's almost always on cooking duty when outside and winds up supplying many of the donuts for a school festival he's dragged into.
- Sweet Baker: While Father enjoys cooking in general and is a Supreme Chef, he especially enjoys baking pastries and cakes that look like they came from a professional bakery. Beneath his brooding and stoic facade is a deeply compassionate person who takes his vows to protect others seriously.
- Thou Shalt Not Kill: Father recites this repeatedly in his head while fighting Mammon as a reminder not to go over the edge, but Father is so blinded by rage at the time that he tries to kill Mammon anyways. Imuri also prevents him from killing a nephilim because she knows that Father may never be the same if he's forced to truly kill another being.
- Trauma Button:
- Naked women are this for Father after being nearly raped as a child by Asmodeus. Seeing women naked gives him PTSD-induced flashbacks, makes him bleed from his right eye and leaves him feeling physically ill. His fear of being raped and seeing others get raped means that pushing this button enrages Father too. Mammon pushes it on purpose to get Father to go all out against him by having Tachibana strip Imuri naked.
- Asmodeus herself is an even bigger one for Father. While he has nightmares of being ripped apart by the other Demon Lords, only Asmodeus manages to make him cry Tears of Blood in his sleep, with him calling her worse than Beelzebub. Simply trying to open up about his feelings about what Asmodeus put him through sends him into a nervous breakdown, leaving him struggling to speak, stand, or even breathe. Father snaps when Asmodeus tries to rape him a second time, resulting in him succumbing to his repressed wrath and overwhelming Asmodeus without any regard for collateral damage.Father: [to Aria, clearly anxious] Four years ago... I somehow won against Asmodeus... so... don't worry. [increasingly anxious] I... somehow did it... [slumps against the wall, nauseous, while bleeding from his right eye] I'm okay... it'll be over soon... It's okay. It's okay. It's okay. It's okay. It's okay. [curled into a Troubled Fetal Position] I'm... okay...
- Troubled, but Cute: Father is kind, socially awkward, and The Comically Serious, all things that Imuri finds endearing. He also has deep-seated mental health issues as a result of his abusive childhood and being used as a Child Soldier against the forces of hell.
- Tyke-Bomb: Inverted. Father was raised by the clergy to be the ultimate weapon against Satan, memorizing the verses of the Bible by heart to weaponize God's miracles against the demons of Hell. This training included by stripped down to his underwear and whipped into compliance by the priest who referred to him as a "thing" to be used against Satan. While this made Father devoted to the mission of exorcizing Satan, it's also left him with severe psychological issues from this and being forced to face one Eldritch Abomination after another.
- Willfully Weak: Father initially refuses to use more than the bare minimum of power he can against Mammon out of fear that another Demon Lord could appear and endanger Imuri while he's exhausted. Mammon is outraged when he realizes this and jumps on Father's Trauma Button by having Tachibana strip Imuri naked.
- Will Not Tell a Lie: Father takes, "Thou shalt not bear false witness against thy neighbor." with deadly seriousness. He won't tell a lie even if it offends someone and answers most questions with Brutal Honesty.
- With Great Power Comes Great Responsibility: Father may be the most powerful exorcist in the world, but he wishes he could stay in a kitchen and cook instead of fighting to save the world from evil. But there are things he knows only he can do and thus he continues to fight despite the suffering and anguish it causes him.Father: I'm a guy... but instead of fighting to save the world from evil... I'd rather be here, cooking in a kitchen. Like I said, I'm no knight... But... there's still one thing only I can do... and that's exorcize Satan.
- World's Strongest Man: Father is the most powerful exorcist in the world by far thanks to his "Miracle Amplification" ability, which Mammon says is akin to elevating the mere miracles of saints into the power of God himself.
Imuri Atsuki
A world-famous painter whose work is beloved around the world. She comes under Father's protection when Satan declares his intent to drag her to Hell. Unbeknownst to the clergy, she's actually a demon in Satan's employ tasked with seducing Father as part of Satan's plans.
- Affably Evil: Her affection for Father is genuine and she goes out of her way to help others more often than not. It's easy to forget that she's a demon from Hell explicitly charged with seducing mankind's greatest hero and making him fall into apostasy, something that would likely doom mankind as a whole without Father to keep the Demon Lords at bay.
- Big Eater: Imuri adores eating and Never Gets Fat, resulting in her downing everything from an enormous ramen bowl that has onlookers looking on in awe to ten croquettes as a snack. It does bite her when her love of sweets finally causes her to gain weight, but she starts working out afterwards to burn it off.
- But Not Too Foreign: Imuri's human persona as Imuri Atsuki is allegedly half-English, half-Japanese and she decides to move to a studio in Japan when Father comes to guard her.
- Cute Little Fangs: Imuri has highly pronounced canines when she gives a big smile as a subtle reminder of her true demonic nature.
- The Defroster: While Father isn't cold, he's often professional and distant as part of his duties as an exorcist. Spending time with Imuri gradually breaks down Father's barriers and makes him more emotionally open and honest with himself. Even Father can't help but notice how unbelievably at ease he feels around Imuri.
- Doom Magnet: Imuri is known as the Femme Fatale in Gehenna not only for her ability to seduce men, but also for her tendency to bring ruin upon them. Flashbacks imply that the men she's seduced in the past have Et Tu, Brute? reactions before events cascade to bring misfortune on both she and them. When Golem is killed protecting her, Imuri says she has no right to grieve. For she is the Femme Fatale, the bewitching sinner wading through bodies at her feet.
- The Face: Imuri's bubbly personality and beautiful appearance make it a cinch for her to get close to others. One afternoon spent gallivanting around Tokyo has her enchanting men, women, and children as she eats, plays with, and chats with them. Her awareness of social cues and skill at manipulating others is part of the reason why she's known as the Femme Fatale in Gehenna. The story begins when she's tasked by Satan himself to seduce Father for an unknown purpose.
- Femme Fatale: Imuri is apparently infamous enough in Hell as a femme fatale to be commanded to make Father fall in love with her as part of Satan's plans. Unlike Asmodeus, who immediately tries to rape Father and gives him a Trauma Button over it, Imuri slowly breaks down Father's barriers through idle chatter, genuine acts of compassion, and giving him the acceptance and validation he craves. Also unlike Asmodeus, Imuri is falling for Father for real and is torn between her duty to Gehenna and her affection for Father.
- Men Can't Keep House: Gender-inverted. Imuri is a world-renowned artist who is awful at housework and cooking, leaving Father to pick up the slack to his chagrin. But this works to Imuri's benefit, as she's able to get closer to him by making him use his skills as a Supreme Chef to blow off steam and bond with her.
- Starving Artist: Inverted. Imuri is a world-renowned artist whose paintings are so beloved that she is said to be one of the wealthiest people in the world. She claims to have an income rivaling the top 3% of earners.
- Super Drowning Skills: Imuri never learned to swim, meaning that she's restricted to the beach when Leah takes them all out to allegedly get Imuri to choose who her bodyguards should be. And yet, she dives in to save a drowning Father without hesitation, demonstrating how she's truly fallen for him.
- Un-Sorcerer: Imuri is part of the same species as the original succubus, Lilith. This means that she's fundamentally indistinguishable from a human due to her complete lack of magical power, letting her pass as one to get close to Father despite working on orders directly from Satan.
- Thou Shalt Not Kill: She prevents Father from killing someone like what he was about to do with Mammon and a nephilim because she knows that Father will never be the same if he killed someone.
- The Watson: Subverted. As far as Father knows, Imuri is a normal human who has no real grasp of what the demons of Gehenna are like beyond the stories of them. So he explains the powers and personalities of the Demon Lords in great depth to give her an idea of how much danger she is in. But as a demon of Hell commanded by Satan himself, Imuri is well-acquainted with all of this information but feigns ignorance to keep her cover.
The Church
Dante
Father's previous teacher and caretaker. Dante is a seemingly frivolous man willing to toss away church money to prostitutes. But his carefree exterior hides a devoted and determined exorcist who is far more perceptive than he appears.
- Anti-Mentor: Dante is a subversion. He initially appears to be someone who's Nun Too Holy and wastes the Church's donations on hiring prostitutes and drinking alcohol for his personal pleasure. But Dante is actually extremely competent, having invited the prostitutes over as a succubus is hiding among them and giving the women money to help them get out of the sex profession. He's also the first to realize and criticize the abuse that Father has been put through and helps Father find a reason to live beyond Blind Obedience to God and the Roman Catholic Church. While he has nothing to teach Father as an exorcist, his life lessons helped shape Father into a heroic and compassionate person rather than a volatile Tyke-Bomb.
- Nun Too Holy: Despite being an ordained priest, Dante enjoys the presence of women and tells Father that it's okay to jerk off every now and then despite it being forbidden in the Bible. He uses church money to hire prostitutes (though he never actually has sex with them and makes sure they have a year's worth of money to go into another, less exploitative profession). He also encourages Father to fall in love even though priests are sworn to celibacy.
- Salt Solution: Dante's prefered attack of choice is the Pillar of Salt, focusiing on conjuring the miracle that turned Lot's wife into a salt as she looked back on the destruction of Sodom. Unable to rot, the salt can damage demons, purify the area it is cast, rust weapons, and is even capable of changing the salt content in an individual's body to deadly levels.
Leah
- Alchemy Is Magic: Leah does not possess the ability to enact miracles on her own, instead combining her faith with alchemy to keep up with exorcists like Father. Her primary method of attack is the ability to convert one thing into another, just as Christ converted water into wine. She's able to turn entire tidal waves into immobile cubes, preventing Leviathan from crushing a town with a surge of water.
- Broke Your Arm Punching Out Cthulhu: Leah successfully aids father in exorcizing Beelzebub and completing her long-awaited revenge. But the strain of using the power of archangels for so long severely damaged her body. Her left eye becomes useless and she won't live long enough to become a grandmother.
- Combat Pragmatist: Leah has zero qualms with using sneak attacks and trickery to get the job done. She begins her fight with Leviathan by reversing the flow of blood in the demon's body, violently rupturing the blood vessels in Leviathan's head and limbs.
- Food as Characterization: Leah is staunchly vegan and gets nauseous even at the thought of eating meat. This is because she was starved to the point of delirium as part of Beelzebub's games until she was so hungry that she ate the corpse of her baby brother, Leo. The sheer psychological damage she suffered when she realizes this causes her body to reject all forms of meat.
- Hour of Power: Like Father and Mother Rosa, Leah is able to call upon the archangels to provide her with additional power. Unlike them, she's not a "chosen one" who can simply heal away her own injuries to compensate for the strain. By invoking them through alchemy to make up for her inability to perform divine miracles on her own, Leah can only use their power for five minutes before suffering from a Heroic RRoD and Blood from the Mouth.
- The Unchosen One: Leah cannot invoke divine miracles on her own, achieving them through her mastery of alchemy combined with her faith. Despite this, she's more determined than anyone else to kill Beelzebub and is willing to die to strike him down when he reappears.
- Unwitting Instigator of Doom: Leah is burdened with immense Survivor Guilt when she, a child at the time, invited Beelzebub into Europe, thus allowing the Demon Lord of Gluttony to murder everyone in her village. This crisis was only ended by the sacrifice of Mother Rosa and dozens of other exorcists to stop the demon's rampage.
- Vengeance Feels Empty: Subverted. Leah expects to hear this when she reveals that her goal as an exorcist is to exorcize Beelzebub and make him suffer for what he did to her family and village. To Leah's surprise, Imuri doesn't try to moralize to Leah about it, likely because Imuri is a demon and has seen plenty of revenge cases herself. When Leah does get her revenge on Beelzebub, she feels so fulfilled that she's ready to succumb to her injuries and join her family in Heaven, only for the spirit of her little brother Leo to kick her in the face and tell her to live on.
Barbara
- Brown Note: Barbara invokes the miracles of Saint Lucia, patron saint of the blind, to blind others who look upon her face without her mask. This even extends to imaging equipment like cell phones and video cameras, allowing her to destroy photographic evidence of the Church's actions.
- Butter Face: Implied. Barbara has the figure of a girl her age but constantly wears a mask to hide her face and only takes it off to use Saint Lucia's miracles. She also has flashbacks to being ridiculed by older men for showing her face.
- Lethal Chef: She tries to cook a stargazey pie for Imuri owing to Imuri's alleged British heritage, but Imuri finds it disgusting and claims that it would taste a lot better if it were cooked properly.
- Satellite Character: She doesn't get nearly as much focus as Leah does and primarily serves as her friend and partner.
Mikhail
Another associate of Father's and a powerful exorcist in his own right. Father reluctantly calls on Mikhail for backup when Asmodeus targets the famed pop singer Aria.
- Attention Whore: Mikhail is something of a narcissist, telling others to behold his cuteness and posting pictures of himself online constantly. Even when Father warns Mikhail not to draw attention, Mikhail insists that everything he does exudes cuteness and makes a scene by skywriting his face via airplane. He's also an extremely famous influencer whose presence quickly draws entire crowds.
- Bait-and-Switch Comparison: While discussing the witches' Freudian Excuse, Mikhail says he sympathizes completely with them... only to spill that his "struggle" is running out of conditioner while taking a shower.
- Bunny-Ears Lawyer: Mikhail is an Attention Whore who adores the limelight and is constantly fussing about his looks while posting all of his activities on social media. He also singlehandedly stopped the witch's sabbaths in Germany and curb-stomps a congregation of dozens of witches in a single attack. Father recognizes Mikhail's abilities and considers him a powerful exorcist, but hates working with him because of how Mikhail's personality complicates things.
- Combat Pragmatist: Despite his frivolous exterior, Mikhail is wise enough to avert Talking Is a Free Action by paralyzing a congregation of witches before they can complete their big spell to summon monsters from Hell.Manon: You! We weren't done chanting yet!
Mikhail: Like I'm gonna watch you do your little tricks. - Establishing Character Moment: He enters the story by jumping out of a plane that had been sky-writing his face over a city before forcing Father to catch him because he's moving too fast to slow down with a parachute. This emphasizes Mikhail's frivolous nature and Attention Whore tendencies while also showing that he's famous and popular enough to pull stunts like these.
- Freudian Excuse Is No Excuse: A congregation of witches criticizes Mikhail for moralizing to them when he knows nothing of what made them turn away from God's teachings. He admits they're right that he can't know or empathize with them, but also asks if it's really okay for them to do evil things just because they were dealt a bad hand in life. He then says the witches' logic would imply that Father is well in his rights to destroy the world, but Father hasn't given in to apathy, hedonism, and violence.
- Hidden Depths: Despite his seemingly self-absorbed personality, Mikhail is exceptionally observant. He's the first to notice that something is off about Aria's situation. The heartwarming school atmosphere that Father is placed in feels like a "B-grade horror film" to Mikhail and instantly has him on-guard around her despite being her bodyguard. He also picks apart the Freudian Excuse of the witches and says that Father would be well in his rights to destroy the world given what Father has been put through. When Father snaps after being nearly raped by Asmodeus again, Mikhail had the foresight to evacuate all of the teachers and staff to another building despite not knowing exactly what was going to happen next, ensuring that Father wouldn't take a single life.
- Loophole Abuse: The defensive magic used by witches protects them from damage. But Mikhail's paralyzing arrows don't deal any damage and simply render the target unable to move, letting him bypass it completely.
- The Paralyzer: Mikhail's preferred method of dealing with his foes is to form a bow out of holy energy and shoot a Rain of Arrows at his foes. These arrows paralyze rather than hurt their targets, rendering them completely unable to move while also penetrating defensive magic simply because it doesn't deal any damage.
- Wholesome Crossdresser: Despite being explicitly male and identifying as such, he prefers to dress in a nun's habit and grow his hair out to look "cute". He does this so naturally that women often forget that he's male.
Demon Lords
In General
The most powerful demons of all and the rulers of Hell. They each embody one of the Seven Deadly sins of humanity: Wrath, Lust, Greed, Pride, Gluttony, Lust, and Sloth.
- As Long as There Is Evil: The Demon Lords cannot be killed permanently so long as the sins of humanity they embody exist. It takes Mammon a mere three years to return from Gehenna after Father beat him last due to greed being such a common sin. The witches of Beelzebub also make sacrifices and worship him to hasten his return after he was last sent back to Gehenna.
- Eldritch Abomination: The Demon Lords of Gehenna are all monstrous to the extreme beneath their human-like facades.
- Asmodeus bursts from the womb of one of her own minions as a figure covered in snake-like eyes and goat skulls where her lower body should be. Her very presence induces ravenous lust is anyone nearby.
- Leviathan's true form is an enormous, eyeless fish covered in dragon-like scales. Her mouth is a gate straight to Hell, is filled with More Teeth than the Osmond Family, and is large enough to swallow an entire fleet of ships. Her scales are so tough that even Father fails to scratch them with his sword. She can also cause replicas of her mouth to appear wherever there is water, devouring everything in her wake and sending them straight to hell. She opens these mouths whenever a demon less than a Demon Lord is defeated.
- Beelzebub's genteel appearance masks the countless eyes inside his head, his arms grow and stretch to titanic proportions, and his coming wraps an entire city in digestive organs as he devours everything in sight.
- My Name Is Inigo Montoya: The Demon Lords of Hell almost always introduce themselves and their titles before unleashing their full power.
- Person of Mass Destruction: The Demon Lords are all Eldritch Abominations capable of enormous destruction. Mammon threatens to flatten a city with a Kill Sat attack as a replication of the events of Sodom and Gomorrah just to goad Father into a fight. Beelzebub's arrival is considered an apocalyptic event and he threatens to devour all of Tokyo just by manifesting. Prior to this, he almost ate all of Europe until Mother Rosa sacrificed herself to beat him back.
- Physical God: The Demon Lords are the physical embodiments of the Seven Deadly Sins, each boasting enormous demonic power derived from the sins of humanity. Each of them is capable of enormous destruction and create their own domains in which they apply the rules. Each of them is a potential apocalyptic threat if left unchecked. Their presence alone can influence reality, as stock prices crash upon Mammon's defeat.
- Seven Deadly Sins: The seven Demon Lords of Hell each embody one of the deadly sins and derive their powers from them. For instance, Mammon, Demon Lord of Greed, derives his powers from mankind's desire for more than they need. Everything from wanting a new video game to land to nuclear weaponry empowers him. Even the desire to trample upon others as a pushback against anti-discrimination efforts is considered "greed" for Mammon to exploit.
- Sleep-Mode Size: After being defeated and returned to Gehenna, Mammon reappears in the form of a child wearing clothes far too big for him, showing that he needs time to regain his powers and return to his former glory. Given that Beelzebub later appears at a similar size, this is implied to be the fate of all defeated Demon Lords until they regain their demonic powers by collecting energy from human sin.
Asmodeus
The Demon Lord of Lust. Asmodeus embodies the carnal pursuit of sex, regardless of whether or not consent is given.
- Abhorrent Admirer: Asmodeus is the Demon Lord of Lust, meaning that anyone who catches her fancy is going to be drowned in pleasure, whether they want to be or not. She grows attached to Father after he rejects her attempt to rape him, believing him to be as pure of heart as her former lover, a girl named Sarah. Asmodeus then uses him as a Replacement Goldfish to see if Sarah would have rejected Asmodeus had she forced herself onto her.
- Chest Burster: Asmodeus makes her appearance by bursting from the body of one of her succubus minions as a mass of flesh, cow skulls and eyes.
- Depraved Bisexual: As the incarnation of lust, Asmodeus' powers work on men and women. She freely uses women as proxies for herself, as shown when she has a horde of women attempt to gang rape Father. She was in a much more intimate and romantic relationship with a girl named Sarah hundreds of years ago. But they never consummated their relationship because the Bible dictates that women can't marry each other. Once Sarah comes of age, Asmodeus begins massacring Sarah's (sometimes abusive) suitors one by one out of jealousy, protectiveness, and possessiveness until Sarah finally rejects her.
- The Dreaded: Out of all the Demon Lords, Asmodeus is the one Father fears most for the physical and psychological scars she left on him years ago. He suffers a nervous breakdown even while trying to talk about her to others, bleeding from his right eye and slumping against a wall while struggling to breathe.
- Eyes Do Not Belong There: Asmodeus is a lamia-like creature with eyes along her arms, on her torso where her crotch should be, and all along her serpentine body.
- Hidden in Plain Sight: When she comes to Father for a rematch, she doesn't go at him directly, instead threatening the life of the famed singer Aria to goad him into coming for her. She is in fact Aria, having created a human guise to captivate others and get close to Father so she can seduce and undermine him. As Asmodeus herself points out, Father will never suspect the victim in an arrangement because of his traumatic past unless he has iron-clad evidence.
- Love Be a Lady: While she is not the only female demon lord, she still partakes in this trope; she was able to gain power through Aria from admiration and desire as well as her lust powers, uses women as her minions, and has a backstory that emphasizes romantic love and how the official rejection of it hurt Asmodeus.
- Manipulative Bastard: As the incarnation of lust, Asmodeus is a master of manipulating the hearts of others when she isn't simply taking what she wants by force. In her human guise Aria, she quickly endears herself to Father by subtly offering him all the things he wants most: a normal life, a confidant to talk about his traumas, and someone to tell him that it's wrong to send a child against the Demon Lords of Hell.
- Not-So-Well-Intentioned Extremist: She's keenly aware of Father's traumatic childhood and promises to sooth Father's loneliness and the pain buried within his heart. But as Imuri points out, Asmodeus is directly responsible for one of the most traumatic experiences in Father's life. And while she claims that she will "fix" Father, Asmodeus also makes it clear that this is also about reclaiming her pride as the Demon Lord of Lust.
- Politically Incorrect Villain: The first thing Asmodeus does after being introduced is to try to rape Father, a twelve-year-old child at the time, with a horde of mind-controlled women. She has no concept of "consent" and is genuinely baffled that Father would refuse her advances when she promised to drown him in pleasure and "take him to heaven".
- The Pornomancer: As the Demon Lord of Lust, Asmodeus is able to instill feelings of pleasure in humans in her vicinity on a level far surpassing her succubus minions. While a sufficiently powerful and prepared exorcist can ward this off with a barrier, she instantly brings Father to his knees since he was only twelve at the time and utterly taken off guard. This, combined with Asmodeus nearly raping him, results in his Paralyzing Fear of Sexuality and Eye Scream from punishing himself for feeling the lust she instilled in him.
- Sinister Nudity: She makes no attempt to hide her monstrous nature and is the only one of the Demon Lords to constantly be in the nude. She's introduced using her powers as The Pornomancer to brainwash dozens of women into trying rape Father, a twelve-year-old child at the time, with no regard for his actual consent. While Father manages to compose himself by tearing out his own eye in penance, the event leaves him with a Paralyzing Fear of Sexuality.
- Starter Villain Stays: Despite the threat she poses, Father manages to exorcise her in a single chapter, compared to all of his other battles with the Demon Lords lasting multiple chapters. While she inflicts some of the most grievous psychological wounds on Father, she is the only Demon Lord who fails to injure him physically aside from his own self-inflicted Eye Scream. Unfortunately, she resurfaces after Beelzebub's defeat, under the guise of the singer Aria.
- Took a Level in Badass: Asmodeus reappears in Chapter 37 by threatening to claim the world-famous singer Aria in the same way that Satan did for Imuri. Father instantly leaps at her to cut her down, but Asmodeus effortlessly parries Father's attack with a smile before sending him backward, implying that she's grown much stronger since their last encounter. Given that the Demon Lords derive power from expressions of human sin, Asmodeus gained an enormous power boost from the overwhelming popularity of her human guise, Aria.
- The Vamp: As lust incarnate, Asmodeus enjoys making people squirm with her sex appeal before she has her way with them. While possessing Aria, she plans to seduce and undermine Father just as Imuri was assigned to do.
- Violently Protective Girlfriend: In ages past, Asmodeus was in love with a girl named Sarah, who loved her back as "Ms. Angel". However, Asmodeus chose not to force herself on Sarah, who remained a virgin until she came of age and was set to be married off to a man despite being a lesbian because of the teachings of the Bible. Asmodeus begins murdering Sarah's suitors one-by-one until Sarah becomes an outcast for her associations with a demon. Asmodeus only stops when Sarah finally rejects her for not letting her fulfill her duties as a wife.
- You Remind Me of X: After consoling Father after a panic attack, him thanking her reminds Asmodeus of Sarah, a girl Asmodeus has fallen in love with hundreds of years ago. It's later implied that part of Asmodeus' obsession with Father comes from his purity of spirit reminding her of Sarah, with Asmodeus wishing that she had taken her and corrupted her fully instead of letting Sarah reject her.
Mammon
The Demon Lord of Greed whose name is synonymous with wealth and treasure. Mammon embodies opulence and needless want in all its forms, deriving power from people's desire to own things they don't have.
- Badass in a Nice Suit: As the embodiment of greed and opulence, Mammon faces Father in a humanoid form dressed in a nice suit rather than as an inhuman monster like Asmodeus.
- Benevolent Boss: Mammon may be a sexist and racist monster who treats women like property and tries to spread discrimination and inequality, but he considers his subordinates his friends and refuses to let them come to harm. Tachibana displays Undying Loyalty toward him for all the pleasures he helped her attain by stamping down on others, showing that he generously rewards those who act in service to him. He also prevents her from committing suicide to join him in Gehenna because he doesn't want to see her hurt.
- Fingore: Fathere slices off Mammon's fingers with a magic sword, destroying Mammon's rings that granted him his Semantic Superpower in the process.
- I Am the Noun: Mammon declares that he is opulence, power, and the embodiment of what makes a "true man" before challenging Father to duke it out with him until one of them drops.
- Inferiority Superiority Complex: Mammon is outraged when Father doesn't go all out against him, shouting that he will not play second fiddle to Satan. He then orders Tachibana to strip Imuri in order to trigger Father's Berserk Button.
- Kill Sat: Mammon challenges Father to a duel by recreating the events of Sodom and Gomorrah via an orbital strike attack that threatened to level the entire city that Father and Imuri are staying at.
- Let's Fight Like Gentlemen: Mammon demands a fair one-on-one fight with Father, going so far as to explain all of his powers to Father and shield Imuri within a barrier of his own making to prevent any harm from coming to her. He's outraged when Father disrespected the terms of this fight by not going all out and mashes Father's Berserk Button and Trauma Button to force him to do so.
- Politically Incorrect Villain: Mammon exemplifies Testosterone Poisoning. He actively opposes things like "women's rights" and "racial equality" as equality is antithetical to his nature as the embodiment of greed. He treats women as property and sex toys to be used at his leisure and purposefully mashes Father's Trauma Button just to get Father to go all out against him.
- Purely Aesthetic Glasses: Mammon is introduced wearing glasses, but it's clear that he's only wearing them to present the image of an intelligent businessman. He suffers no loss of eyesight when Father punches them off his face and they subsequently slug it out.
- Semantic Superpower: The rings on Mammon's fingers allow him to summon and control the things that has inspired humanity's greed throughout history. The first lets him summon vast amounts of treasure to use as super-hard projectiles to bury his foes in, the second lets weaponize all of humanity's technology, and the third lets him warp his surroundings into a field of drugs, medicines, and poisons to debilitate his foes.
- Sore Loser: Zigzagged. He's not mad when Father beats him, even telling Father to finish him off as a "real man" would. But Mammon descends into a full on Villainous Breakdown when Father stops paying attention to him and starts thinking about what Imuri wants to eat after she shouts about dinner. He rants and raves at Imuri for violating this "sacred virtue" between men, only to get shut up when Father casually tosses him back in the gate to Hell and Imuri shuts the door.
Leviathan
Click here to see her true form
The Demon Lord of Envy, Mother of Mighty Beasts, and Blessed by the Lord. Leviathan is the mother of all life in the sea, but is frustrated by how her strength kills anyone she tries to befriend. Intrigued by Father's strength, she lets herself wash ashore in the form of a little girl for a chance to befriend him.
- Adorable Abomination: Leviathan is an enormous beast who initially appears in the form of a Cheerful Child who wears her normally monstrous features like a weird sweater. She's no less powerful in this form and can squash a defeated Mammon into a blood stain with a single swipe.
- Bad Liar: Leviathan's lies as to how she washed ashore from the shipwreck the other day are hardly convincing. Both Leah and Barbara find her suspicious from the outset and don't want to take her in at first. But after hearing about how Leviathan's "Papa" told her to have lots babies, Father immediately takes her under his wing because of his lasting trauma from his childhood.
- Blue-and-Orange Morality: Unlike the other Demon Lords, Leviathan is not malicious toward humanity, instead envying their ability to congregate toegether and form relationships beyond master and servant. But as demon of Hell, her sense of morality is skewed. She sees nothing wrong with manipulating Father in an attempt to befriend him, but is also afraid of breaking his arm by accident when she clutches it in her sleep.
- Breath Weapon: Her true form is able to fire a powerful beam hot enough to incinerate steel instantly and enough range to destroy satellites orbit. Taking this attack strips Father's arm and legs to the bone.
- Commonality Connection: Since she and Father are both blessed by God with miraculous abilities, Leviathan believes that he may be the one and only human who can meet her as an equal in strength and rushes to shore to see if she can befriend him.
- Does Not Know His Own Strength: Leviathan's attempts to befriend others always ended badly because she's so powerful that she can kill others simply by opening her mouth and letting ships fall in. Her attempts to reach out a fin in friendship or provide an Affectionate Gesture to the Head turn people into blood smears and reduce settlements to rubble.
- A Form You Are Comfortable With: Leviathan initially appears as a prepubescent girl, which is later revealed to be her active attempt to interact with mortals and gain friends. But her careless use of her strength and Blue-and-Orange Morality led to her being reviled as a ship-sinking fairy or a mermaid who lures sailors to their deaths. Her true form is an enormous, scaled aquatic behemoth large enough to swallow dozens of ships whole with a mouth that acts as a gate directly to Gehenna.
- Friend to All Living Things: As the mother of all life in the sea, Leviathan is revered by all aquatic life who immediately rush to her side when they think she is in danger. They have no qualms with being eaten by her as it's simply returning to their mother.
- Graceful Loser: Leviathan takes her defeat the best out of all the Demon Lords, simply saying "Ouchie..." when Father cuts her apart from the inside. She then offers Father a single favor as a reward for besting her but doesn't take it personally when he rejects taking help from a demon. Even as her body sinks into the depths, a piece of herself ferries a drowning Father and Imuri back to shore. A later panel shows her watching Aria's musical performance from the bottom of the sea, implying that she crossed back over to the human world after her defeat.
- I Just Want to Have Friends: Owing to being the embodiment of envy, Leviathan is jealous of "weak" creatures for being able to form connections with others when she's Lonely at the Top. She frequently takes the form of a little girl in an attempt to appear cute and harmless, but her Blue-and-Orange Morality and carelessness means that she inevitably leads people to their doom once her identity is revealed. She's interested in Father because they're both blessed by God, meaning that he could be the one man capable of standing as an equal to her.
- Innocently Insensitive: Leviathan unknowingly tramples on Father's Trauma Button when she offers to have his children as thanks for helping her while also saying that her own father (God) had her give birth to many babies. Combined with her child-like avatar, this makes Father come to the wrong (but understandable) conclusion that she's the victim of a pedophilic father.
- Lonely at the Top: Unlike the other Demon Lords, Leviathan bears no real malice toward humanity and in fact wants to befriend them. But she's so huge and powerful that any interactions she has with people inevitably end in tragedy because of how she crushes humans without trying to. This leaves her dreadfully lonely and envious of those who were born weak enough to interact with and make friends with others.Leviathan: Mama's alone. Mama's mouth opens to talk... and everything around it falls in. Mama reaches out for friends... and destroys them with just a pat. It's not fair that everyone's so weak. Mama never asked to be born strong! Like this, Mama can only be feared. No one can be equal with Mama.
- Making a Splash: She has control over all the world's oceans, allowing her to create tidal waves that can smash entire cities into rubble in an instant. If not for Leah constantly dispersing each and every wave, the coastal town the heroes fight Leviathan near would be swept out to sea.
- Mother of a Thousand Young: Leviathan single-handedly gave birth to all the life found in the world's oceans. As a result, all aquatic life refers to her as their mother and are absolutely loyal to her. They will fight and die for Leviathan, rushing to her aid when they believe Father kidnapped her.
- Nigh-Invulnerability: The scales of her true form are so tough that Father's sword can't cut through it. He's only able to hurt her after she swallows him, allowing him to cut her apart from the inside.
- Parental Substitute: She was the one who raised Imuri in the absence of Imuri's parents. As a result, Imuri calls her "Mama" too and loved her like one. In the present, Imuri sees Leviathan as an embarrassing parent, especially after Leviathan teasingly threatens to "take her man".
- Third-Person Person: Like a mother talking to a child, Leviathan constantly refers to herself as "Mama" in the third person. She drops this when she gets serious after Father tells her that she needs no one's acceptance but her own, introducing herself as the Demon Lord of Envy.
- Unskilled, but Strong: Leviathan does not have the myriad of techniques and powers that Mammon has and her go-to strategy is simply to crush everything beneath her waves and enormous body. But her physical strength, Breath Weapon attack, and the threat of her tidal waves are so absurd that she nearly kills Father with these attacks alone.
Beelzebub
The Demon Lord of Gluttony and the Lord of the Flies. Beelzebub fancies himself a connosieur and seeks to devour only the finest dishes in all of creation... but is more than happy to consume cities and even continents if it means getting a taste of Father.
- Arch-Enemy: Beelzebub is Leah's ultimate enemy, having tricked her into inviting him into her village, allowing him to murder and devour everyone inside before forcing Leah to eat the remains of her little brother. This is why Leah is obsessed with killing the Lord of the Flies.
- Bishōnen Line: Beelzebub first appears to humans as a Silver Fox of an old man. His Game Face has him revealing dozens of eyes in his skull before transforming into a vaguely humanoid insect-like being. At the end of his fight, he takes on the saintly features of an angel, complete with pious robes and angel-like wings, after eating a purified piece of Asmodeus. Father, Dante, Leah, and Barbara need to work together to defeat to defeat Beelzebub in this state. Even then, they only succeed after Vergilus weakens Beelzebub by destroying the Demon Lord's fake finger.
- But for Me, It Was Tuesday: Leah hates Beelzebub more than any demon in Gehenna for what he did to her family and village, spending every waking moment plotting to kill him the moment he shows his face back on Earth. When the two finally meet again, Beelzebub asks, "Do I know you?"
- The Dreaded: While Asmodeus, Leviathan, and Mammon are all some of the most dangerous demons around, Beelzebub is called "a Demon Lord among Demon Lords". His arrival is a world-ending threat and Father has nightmares of being devoured by the Lord of Gluttony's insects since he lost to Beelzebub in their last encounter two years ago. By the end of their rematch, Father needs timely aid from Leah, Dante, Barbara, and even Vergilus to take Beelzebub down.
- Extreme Omnivore: Beelzebub fancies himself a connosieur and a Picky Eater, but in truth he would like to devour everything in the world. People, animals, buildings, plants, the ground, even his fellow demons... there's nothing material that he cannot and will not eat.
- Underestimating Badassery: He sneers at Leah and Barbara, considering them junk food not even worth looking at compared to Father, who is the "main course". Beelzebub's refusal to take them seriously nearly gets him killed by them. He is only saved when Leah suffers a Heroic RRoD at the worst possible time, giving him an opening to take Barbara hostage.
- Yin-Yang Bomb: Beelzebub gains the powers of an angel after eating the small part of Asmodeus that was purified by Father's exorcism of her. In addition to his demonic powers, his gives him the same power of angels and miracles that Father has, letting him bind Father in the same miracles that Father was using to fight him, only to an even greater extent.
Satan
The Demon Lord of Wrath and the most powerful of the Demon Lords of Gehenna. Exorcizing him is Father's ultimate goal. Satan is aware of this and sends Imuri to seduce Father for reasons unknown.
- Animal Motifs: Serpents. His usual wear has him draped in a white robe with a serpent wrapped around his neck. Later on while tempting Father to give into his rage and anguish against Asmodeus, he appears as a white serpent.
- Big Bad: Father's ultimate goal is to exorcize Satan, greatest and most powerful of the Demon Lords of Gehenna. Satan is also the one to have set the main plot in motion by sending Imuri to seduce Father.
- Dissonant Serenity: Satan chats with Imuri over the phone with a friendly, casual tone while torturing Mammon's fallen angels as a form of "discipline".
- Manipulative Bastard: In Chapter 51, Satan successfully tempts Father with Wrath by using the latter's rage towards Asmodeus.
- Pet the Dog: Despite being the most powerful demon and Imuri's boss, Satan's rather indulgent of her. He is neither surprised or upset when Imuri announced Satan couldn't control who she dated when he initially assigned her to seduce Father. She can even cut off phone calls and make requests to him without fear of punishment.
- Storm of Blades: Satan is able to conjure swords out of light to impale his foes, skewering Yamato with a half-dozen of these while more rise up behind him.
