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    Satan, The Demon King 

The ruler of Gehenna, and father of Rin and Yukio, along with Samael, Amaimon and Lucifer.


  • 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.
  • A God Am I: Declares himself this after taking in all the knowledge he could in Chapter 105, naming himself Satan.
  • Archnemesis Dad: While he may be Rin and Yukio's father he is the Big Bad of the series.
  • Authority Equals Asskicking: The ruler of Gehenna, first of the eight demon kings, and is so powerful his mere presence destroys most of his human hosts.
  • Ax-Crazy: First appearance in the manga and anime reeks of this. In the anime, after possessing Yukio and playing pyromaniac he seriously keeps up that appearance. Yet with Yuri, he was quite sane and even inquisitive.
    • In the manga, he maintains this later on. When Yukio attempts to shoot himself in the head, Satan simply laughs at his failed attempt, since the act caused Yukio's satanic gene to activate, which saved Yukio's life. To repeat, he laughed at his own son's suicide attempt.
  • Big Bad: The king of Gehenna, leader of the demons, and the primary cause of Rin's conflict.
  • Blue and Orange Morality: In the 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.
  • Body Horror: Anyone he possesses without sufficient compatibility will burn and mutate.
  • Demonic Possession: He tries but always fails. The number of people who can perfectly house his full power is limited to less than five people. Everyone else spontaneously bursts into flames.
  • Exactly What It Says on the Tin: He's freaking Satan.
  • Hellfire: His trademark blue flames. He's the ruler of the place where this stuff comes from.
  • Genius Loci: In the manga, it turns out that he isn't just the king of Gehenna, he is Gehenna itself.
  • 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.
  • 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.
  • Love Makes You Evil: Anime only. In the anime's 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.
  • Occult Blue Eyes: His blue eyes are one of the few identifying features he is known to have.
  • Playing with Fire: His signature blue flames.
  • Possession Burn Out: His first body starts burning out within two years after he ran from Asylum.
  • Jerkass: He treated Rin terribly during their first meeting and all the while possessing Fujimoto.
  • Superpower Meltdown: Destroying hosts is a common problem with powerful demons, which is why they use various PowerLimiters to stay in Assiah. As the strongest demon of all his mere presence causes this these leading to a lot of gore and Body Horror for his unfortunate victims.
    • His original body wasn't spared from this either and eventually it began to rot away and leave him in enough pain that it forces him to return to the Asylum in order to seek out a way to prevent it.
  • 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.

    Amaimon 
https://static.tvtropes.org/pmwiki/pub/images/Amaimon_8685.jpg
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.


  • Anime Hair: He has a horn/spike hairstyle similar to Tao Ren's.
  • Authority Equals Asskicking: He's only 7th or 8th highest ranking of all demons in terms of strength, making him one of the weakest of the demon kings, but he is still a demon king.
  • 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: A good way to get him serious or into a fight is to laugh at him. So don't laugh at him. Ever.
  • 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.
  • 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.
  • Creepy Blue Eyes: Possibly to help show he is one of Satan's children; see occult blue eyes and adaption dye job above.
  • 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.
  • Immortality Begins at 20: While his human host appears to be a teenager, the 10th volume of the manga mentions Amaimon has been using him for almost a thousand years.
  • 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.
  • Knight of Cerebus: As soon as he shows up, things start to get dangerous for Rin. 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.
  • 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.
  • Pre Ass Kicking 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.
  • Put on a Bus: Disappears after his big fight with Rin in ch13. He reappears later briefly in both ch39 and ch44, before finally returning at the end of ch82.
  • Really 700 Years Old: He is at least a thousand years old.
  • 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 Evil in a Can: Mephisto essentially has a tight leash on Amaimon at all times and basically gets called out to "train" Rin or some other errand.
  • 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.
  • You Gotta Have Blue Hair: Similar to how Mephisto has purple hair and Rin has blue hair it is most likely to help show he is a demon.

     Kuro (Blacky) 
https://static.tvtropes.org/pmwiki/pub/images/300px-Kuro16_9347.jpg
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.
  • Cool Pet: 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.
  • Early Installment Weirdness: 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.
  • No Pronunciation Guide: The official pronunciation (in the dub at least) is Cat-See, the actual pronunciation is supposed to be Kett-Shee.
  • Panthera Awesome: He is a rather impressive example when big and could hold off a bunch of exorcists without much trouble.
  • Sizeshifter: Between huge demon and normal cat sizes.
  • Telepathy: Rin can read his thoughts.

    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


  • Extra Eyes: 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.
  • 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.
  • Mystical White Hair: Has white hair because he is a 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.
  • 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.
  • Reptiles Are Abhorrent: 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.

    Belial 

Mephisto's butler

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