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Satan, The Demon God
The embodiment of Gehenna and father of Rin and Yukio.
- Above Good and Evil: The moment he realizes how much stronger he is than everyone, he decides he's above such notions and he can do whatever he wants.
- Abusive Dad:
- He treated Rin terribly during their first meeting, referring to him as an experiment and treating him as an object.
- He's no better to his other son Yukio, outright laughing at him when he tried and failed to kill himself.
- In the manga, Satan didn't care about the newborn twins at all, asking Yuri if they were supposed to be a snack when she tried to show them to him.
- Adaptational Heroism: In the anime original material, Satan caused the Blue Night to save Yuri who was going to be executed for carrying his children. In the manga, the Blue Night was Satan desperately looking for a new body after his host body expired. On top of that, he reveals that he killed Yuri's adoptive family in his first failed attempt to possess a body. This was what made Yuri finally realize was always an evil monster.
- Adaptational Nice Guy: In the first anime, he was quite sane and inquisitive around Yuri. In the manga, he was more of a Psychopathic Manchild who was possessive of Yuri.
- Archnemesis Dad: He is Rin and Yukio's biological father and the Big Bad of the series.
- Ax-Crazy: When he manages to possess a body, Satan acts like an evil maniac and casually burns people to death.
- Beard of Evil: When possessing Goro's body after a while, he has a long unkempt beard and is evil.
- Big Bad: The embodiment of Gehenna, leader of the demons, and the primary cause of Rin's conflict.
- Blue-and-Orange Morality:
- In the first anime. Oh, Satan. When Yuri said she dreamed of a world where demons and humans could live together, she didn't mean that you should turn Assiah into a wasteland in the process. Also, "nurturing a life" implies that you are not allowed to possess said life at a later date. Poor Communication Kills indeed.
- In the manga, when he was Rinka, he was essentially a baby made of all creation. He could take in knowledge with ease, but his emotions and reasoning were behind the curve.
- Later in the manga he stops being so baby like, but continues to be entirely self absorbed and incapable of understanding human emotions.
- Body Horror: Anyone he possesses without sufficient healing factor will burn and mutate.
- Crazy Jealous Guy: He took it very badly when he realized Yuri and Shiro liked each other.
- Demonic Possession:
- In the first chapter, he possesses Shiro to try and get to Rin, but Shiro stops him by killing himself.
- In the backstory, Satan's first successful possession was Shiro's "brother" Goro, a clone who had been pumped full of experimental regeneration inducing elixir his entire life so the body didn't burn to ashes when Satan took it.
- Divine Date: He's basically the god of Gehenna. In both the manga and the anime, he fell in love with a human woman named Yuri and conceived twin sons with her.
- Eldritch Abomination: His Gehenna form is a flame with many eyes perched on top of a pillar shaped mass of twisted human bodies.
- Elopement: With his host body decaying, Satan wanted to spend the little time he had left with Yuri. They attempted to run away from Section 13 together, but they were captured. Satan attacked the exorcists, but his body shouldn't handle his power anymore and he ended up brain-dead.
- Genius Loci: It turns out that he isn't just the king of Gehenna, he is Gehenna itself.
- A God Am I: He declared himself a god after taking in all the knowledge he could.
- Greater-Scope Villain: Due to his inability to stay in Assiah for more than a few seconds, he's more of a background character despite his authority and power.
- Guardian Entity: Before he fully developed an ego, his first conscious actions were to follow Yuri and protect her from harm.
- Hate at First Sight: He hated Fujimoto the moment he saw him. Then when Fujimoto beat him in a simple game and was shown to be close to Yuri, he decided to do whatever it took to beat him.
- He Cleans Up Nicely: He cleans up to look identical to Shiro after a shave and haircut.
- Hellfire: His trademark blue flames. He's the ruler of the place where this stuff comes from.
- I Have Many Names: Before he was known as Satan, he appeared to people as blue fireballs, bearing the names of Rinka, Demon-Fire, Azul, Irrlicht, Will-o'-the-Wisp, Ignis Fatuus and more.
- I Just Want to Be You: When attempting to possess Shiro during the Blue Night, Satan admitted that what he always wanted was to be Shiro, the man Yuri loved.
- Love Makes You Evil:
- In the anime-original climax, his plan is to create a world where humans and demons can coexist because that's what Yuri, his human lover, wished for. He does this by possessing their son, merging Assiah and Gehana in apocalyptic fashion, and beating their other son when he objects.
- In the manga, part of his issues stem from the fact that Yuri spends time with Shiro. Trying to fix that led to him studying up and developing a God Complex. Later subverted. It turned out Satan was always awful, he just tended to hide it in front of Yuri.
- Meaningful Rename: Yuri called him "Rinka" when he was a Will-o'-the-Wisp that played with her. After he fully develops an ego, he names himself Satan the Demon God.
- Mistaken Declaration of Love: When his clone body was about to die, he desperately searched for Yuri. Since his eyes didn't work anymore, he mistook a bedridden Lucifer for Yuri and confessed how Yuri was the only one he needed and loved.
- Occult Blue Eyes: His blue eyes are one of the few identifying features he is known to have.
- The Pig-Pen: He doesn't care about personal hygiene in the least. The only time he ever shaves, bathes, or wears real clothes is when Yuri is taking care of him.
- Playing with Fire: His blue flames are the most powerful form of fire in both worlds.
- Possession Burnout: Destroying hosts is a common problem with powerful demons, which is why they use various Power Limiters to stay in Assiah. As the strongest demon of all his mere presence causes this, leading to a lot of gore and Body Horror for his unfortunate victims. The number of people who can perfectly house his full power is limited to less than five people. Everyone else spontaneously bursts into flames. His original body wasn't spared from this either and eventually it began to rot away and left him in enough pain that it forced him to return to the Asylum in order to seek out a way to prevent it.
- Psychopathic Manchild: The personality he developed as "Rinka" is that of one big bad-tempered child who cannot tell the difference between good and bad, only caring to have Yuri's attention. He would burn people to death as part of his tantrums or out of a whim because he didn't understand why killing is wrong.
- Rank Scales with Asskicking: The embodiment of Gehenna, source of the eight demon kings and all of demon kind, and so powerful it took a lab of scientists working to create stronger hosts for the demon kings for him to even find a host that wouldn't die immediately.
- Sore Loser: He tried to attack Shiro after he beat him at a children's game.
- Stalker with a Crush: Ever since Yuri was a little girl, Satan was constantly watching and following her in the form of blue fireballs. After he managed to possess a body, the first thing he did was look for Yuri and became obsessed with spending time with her.
- Technicolor Fire: His signature blue flames.
- Thinking Up Portals: Is the only being who can naturally, and efficiently, create a Gehenna Gate. However, there is rarely a person who can last long enough for him to create one.
- Truly Single Parent: All the Demon Kings consider Satan their father, but their original forms in Gehenna don't have physical bodies and only exist as concepts. Satan is just the original force that created all the other Demon Kings.
- Uncleanliness Is Next to Ungodliness: Satan is quite disgusting in addition to being evil. After busting out of the lab he holed up in a sewer for two years, and even after returning to the lab he tends to spend his time in a pile of rubble. He's also highly unkempt and almost never wears more than an open hospital robe.
- Walking Shirtless Scene: During the siege of section 13 he wore only an open medical robe and nothing else.
- Will-o'-the-Wisp: Originally, he could only manifest in Assiah in the form of small fireballs. He eventually possessed a clone of Azazel to interact with Yuri and gain knowledge.
- Yandere: As soon as he became self-aware and possessed a body, Satan developed an obsession for Yuri and would try to kill anyone he saw as a obstacle for having her to himself. This is later revealed to have been the case since they first played together. The fire that killed Yuri's family was a result of Rinka attempting to possess Okumura to get to her. This is subverted after his host body exploded and Yuri rejected him because she understood he was nothing but an obsessive monster. When he meets Yuri's spirit in Gehenna, Satan doesn't give a damn about Yuri anymore and all he cares about now is getting a new body.
Amaimon
Voiced by: Tetsuya Kakihara (JP), Darrel Guilbeau (EN)
Mephisto's younger brother and another son of Satan, known as the "Earth King". He seems rather detached and childish and doesn't care much about Rin, preferring to go tour Japan.
- And Now You Must Marry Me: He uses Chuchi larvae to take control over Shiemi and plans to force her to be his bride.
- Bad "Bad Acting": While making a distraction to help Rin and co. free Yukio from prison, Amaimon simply reads his lines off a piece of paper, even his evil laugh is stilted, as shown by the fact each "Ha" is in its own bubble.
- Berserk Button: He usually doesn't fight seriously, but laughing at him will get him pissed.
- Beware the Silly Ones: He may be odd but he can break a man's arm by poking it and kill any exorcist who tries to stop him.
- Big Brother Bully: In a matter of speaking, towards Rin. They're half-brothers after all, and he beat the kid senseless.
- Big Eater: He is often seen eating junk food and candy whenever he appears in, but is one of the skinniest members of the cast.
- Big Ol' Eyebrows: Absurdly shaped and large.
- The Bus Came Back: He disappears after his big fight with Rin in ch13 because Mephisto had Amaimon locked inside a magic clock to stop him from seriously trying to kill Rin. He reappears later briefly in both ch39 and ch44, before finally returning at the end of ch82.
- Cloudcuckoolander: He will start talking about surfing while standing on a speeding roller coaster in the middle of a fight or use his fingers as pretend binoculars while spying on his little brother.
- Compulsory School Age: He's at least over 1,000 years old, but Mephisto can pass him off as his young nephew and enroll him at his academy because Amaimon has a young-looking host body.
- Curbstomp Battle: In chapter 39, he knocks Rin out in a single hit going into his true form, making it clear that Rin is not stronger than him. In the anime, the positions are reversed, as Rin is capable of incinerating him in a single blow.
- Demonic Possession: Technically, for a demon to stay in Assiah aside from being born, they have to do this. An Omake stated he's possessing some poor guy.
- Dishing Out Dirt: As the King of Earth.
- Dissonant Serenity: The whole time he's fighting Rin and the others, he seems...calm. Amused. He also lets out a cheerful "yaaaay" when Rin unsheathes Kurikara.
- Dull Surprise: Despite having almost 1000 years experience with human emotions he hasn't quite got the hang of facial expressions yet.
- Familiar: His is a large hobgoblin called Behemoth.
- Fangs Are Evil: His seem more obvious than most because of how often they're shown, since he is often seen eating.
- Fun Size: In the anime he can turn into a hamster.
- Hellish Pupils: Like most demons his pupils are slitted.
- Idiot Hair: He has a horn/spike sticking up on the top of his head.
- Impaled with Extreme Prejudice: By Berserk Rin in the anime and Mephisto in the manga. Since he is a demon neither case actually kills him, only succeeding in destroying his host body and turning him into a Demon Pincushion respectively.
- I Shall Taunt You: Or in this case "I will pretend to play a Japanese version of tag to get you to fight me" or "I will target your Love Interest and pretend to marry her (or chew her lips off) to make you take fighting me more seriously".
- It Amused Me: Like his brother, he's primarily interested in simply doing something that doesn't bore him.
- Lightning Bruiser: One finger from him could break a bone and he was so fast that Rin could hardly keep up with him.
- Meaningful Name: He shares a name with a Biblical Prince of Hell, which is only to be expected.
- Morphic Resonance: His hamster form is mostly green with a lighter colored hair-horn that mimics his human form.
- Oral Fixation: He's normally chewing or sucking on some kind of treat like chips or lollipops.
- Pre-Asskicking One-Liner: "'Don't screw around' is my line."
- Psychopathic Manchild: He treats fighting like its a game to him, wants to kill anyone that he finds annoying, and doesn't care many people up hurt or killed because of his actions long as he doesn't upset his big brother.
- Really 700 Years Old: While his human host appears to be a teenager, the 10th volume of the manga mentions Amaimon has been possessing people for almost a thousand years.
- Relatively Flimsy Excuse: After his return, he enrolls at the normal high school of True Cross Academy under the guise of being "Johann Faust's nephew".
- Reptiles Are Abhorrent: His true demon form revealed with his "Demon Heart" has very lizard-like qualities like his tail design, scaled arms, and green coloration.
- Saying Sound Effects Out Loud: Byoooooo~n.
- Sealed Badass in a Can: After his second fight with Rin, Mephisto keeps Amaimon trapped inside a magic clock to stop him from seriously trying to kill Rin. Mephisto eventually lets Amaimon out after the latter promises to behave himself.
- Super-Power Meltdown: Why he, and most demons, hide their Demon Heart. Even throwing one super punch was enough to knock himself out because of the strain it put on his host.
- Super-Strength: A poke from him breaks bone. He also launches Rin through a roller coaster by just flicking him.
- Sweet Tooth: He is often seen eating candy, possibly due to how his name sounds like "Amai Mono" which means "sweet things" in japanese.
- Tareme Eyes: An inversion where a male villain has 'em.
- Tranquil Fury: Since his face isn't that expressive he winds up looking really calm even if he's in the middle of punching someone's FACE off.
- Wake-Up Call Boss: He's the first opponent that takes a lot for Rin to beat. More so on his second appearance, where he seriously threatens and even harms the main cast and forces Rin to use his Blue Flames to save them all...resulting in the execution order over his head.
Kuro (Blacky)
Voiced by: Ayahi Takagaki (JP), Stephanie Sheh (EN)
A cat sith who used to be the guardian deity of some local silk farmers. Was forgotten by people as the times changed, going berserk, but Fujimoto was able to tame him and make him his familiar. Later became Rin's familiar after he calmed Kuro from the rage of hearing about Fujimoto's death.
- Badass Adorable: Adorable as a normal sized cat and badass in his giant size.
- Bakeneko and Nekomata: Kuro is a size shifting demonic two-tailed Cait Sith, thus acting as a combination of the Nekomata from Japanese mythology and the Cait Sith from Celtic folklore.
- Cute Kitten: May be a sit, but is otherwise just as playful and adorable as an ordinary cat once Rin manages to calm him down.
- Early Installment Character-Design Difference: At first, one of Kuro's fangs was very large and tilted upwards outside his mouth. That eventually disappeared with him gaining normal looking cat teeth, and the anime omitted that detail altogether. An omake expanded upon this detail saying that that fang allows cat sith to change their form. However, since Kuro chose to be Rin's familiar without really getting anything in return it was taken away from him. His "human form" can be seen at the beginning of chapter 28.
- Familiar: While not a summon like most familiars he acts as Rin's after Fujimoto's death is explained to him.
- Fun Size: He can be small enough to act as a Head Pet.
- Head Pet: In his small form he rides on Rin's head or his shoulder.
- Mega Neko: He can get to be bigger then some CARS. Rin (and friends) can ride him.
- Multiple-Tailed Beast: He has two tails of the split version.
- Panthera Awesome: He is a rather impressive example when big and could hold off a bunch of exorcists without much trouble.
- Ridiculously Cute Critter: In his normal size he resembles an ordinary, cute housecat.
- Sizeshifter: Between huge demon and normal cat sizes.
- Telepathy: Rin can read his thoughts.
Nee
Voiced by: Nao Tōyama (JP), Cassandra Morris (EN)
A Greenman and Shiemi's familiar.
- Barrier Warrior: Nee can create barriers to protect Shiemi.
- Familiar: Shiemi's familiar who aids and protects her when she's in trouble.
- Green Thumb: He has the ability to rapidly grow plants.
- Plant Person: Demon rather than alien, yet Nee is a type of demon made of plants.
- Ridiculously Cute Critter: Well, cute plant is more like it. May not be an animal but just look at him!
- Sizeshifter: Like Kuro, Nee can be as small as to ride his master's shoulder and grow bigger than Shiemi.
Uke & Mike
Uke is voiced by: Kensuke Nishi (JP), Kirk Thornton (EN)
Mike is voiced by: Go Inoue (JP), Ben Pronsky (EN)
Mike (left) and Uke (right)
A pair of Byakko who are servants of Uka-no-Mitama, a deity of food and agriculture. They currently serve the Kamiki family, allowing Izumo to summon them as her familiars. They're not always obedient to her, though.
- Asian Fox Spirit: They're Byakko, a type of demon that possess beasts and co-exist with humans as divine servants. They often appear as white foxes with markings on their foreheads and often some form of clothing.
- Eyes Always Shut: Uke keeps his eyes closed, giving him the classical look of a fox from Japanese folklore.
- Familiar: Izumo can summon them for combat. Before Izumo, they were familiars to Izumo's mother, Tamamo.
- Mark of the Supernatural: They look like normal white foxes, but they have tomoe-shaped markings on their eyebrows and muzzles to signify their nature as Byakko.
- Perpetual Frowner: Mike is always frowning.
- Religious and Mythological Theme Naming: Both are named after a Shinto deity. Uke is named after Ukemochi, a Shinto goddess of food, and Mike is named after Miketsukami, which is one of the names of the agriculture god Ukanomitama.
Hachiro
Known as Hachitaro of the Sanko, this man is a super-high level demon known as a Hydra and the one who initially gave Shura her Ancestral Weapon due to a pact made with her ancestor. He's intent on Shura having a child to continue honoring their deal.
Unmarked Spoilers Below
- Alas, Poor Villain: Shura and Rin feel sorry for Hachiro after he's turned into a harmless snake because they know all Hachiro wanted was to be with his beloved Tatsuko forever.
- Amazon Chaser: He fell in love with Tatsuko during a swordfight with her and thought her resolution to grow stronger was beautiful.
- Arc Villain: He's the villain of the Aomori arc where Rin, Yukio and Shura fight him to free Shura from the curse Hachiro placed on her bloodline.
- Blade Below the Shoulder: He can turn his right arm into a sword.
- Expository Pronoun: He refers to himself as "we" instead of "I" because he's an Orochi which is a snake monster with many heads.
- Extra Eyes: He has a ridiculous amount of eyes on his face, which enhances his creepy and inhuman appearance.
- Healing Factor: His healing factor is so strong that he's essentially immortal, and his blood can heal wounds quickly. This makes him a target for the Illuminati.
- Hypnotic Eyes: His eyes have a hypnotic effect that can paralyze his targets.
- Interspecies Romance: He was in love with a human woman.
- Love at First Punch: He first met Tatsuko when they had a swordfight and he fell for her fighting spirit.
- Love Father, Love Son: Long ago, he loved a human woman named Tatsuko. Since he's an immortal, he placed a curse on her descendants so that they would look identical to Tatsuko. This way, Hachiro deludes himself into thinking he and Tatsuko are together forever.
- Loving a Shadow: He's under the delusion that Tatsuko and her descendants are the same person because they all look identical. Shura tells him many times she's not the woman he loves, but it falls on deaf ears.
- Master Swordsman: Noted to have spent his very long life practicing the sword to kill time. He's the one who taught Shura and her ancestors.
- Mayfly–December Romance: Hachiro is an immortal snake god who fell in love with a mortal woman named Tatsuko. Never wanting to see Tatsuko growing old, he formed a pact with her so she would die at thirty and leave behind a daughter who would look just like her. All of Tatsuko's descendants are under this curse. Hachiro, on the other hand, deludes himself into thinking this is an Eternal Love Reincarnation Romance.
- Mystical White Hair: Has white hair because he is a demon.
- Orochi: His true form is an eight-headed snake demon.
- People Puppets: Can control people who he lays his eyes on, though he mentions not liking to do it because it dulls the mind.
- Property of Love: He proclaims every Tatsuko belongs to him.
- Reincarnation Romance: Invoked sans the memories of the past. He falls deeply in love with Tatsuko and wants to be with her always. So, as part of the blood curse, all of Tatsuko's line will be women and they will all look like she did. This way he can be with her forever, at least in his mind.
- Sealed Evil in a Can: He was sealed in the Towada Lake by a monk over a thousand years ago and has been unable to leave the area since.
- Snakes Are Sinister: He comes off this way because he's intent on making Shura honor her ancestors deal, one way or another.
- Who Wants to Live Forever?: He's bored with eternal life being sealed away, so when he fell in love with Tatsuko it was refreshing.
- Yandere: He placed a curse on the woman he loved which killed her and all her following descendants at thirty out of fear that Tatsuko's beauty would be lost once she grew old. He keeps every Kirigakure as his prisoner under the delusion they're all Tatsuko.
Belial
Mephisto's butler.
- Satellite Character: His only role is serving Mephisto and has no notable characterization to speak of.
