Satan's true Demon form has not yet been shown in the series, but when he possessed Shiro, he had typical Demon features such as pointy ears, long nails and sharp canine teeth. The possessed version of Shiro also shows features similar to Rin's own Demonic form, these being the black tail with a blue flame at its end and blue flames covering the body.
The various hosts of Satan have of course possessed their own appearances. Only two people in the anime version, Yuri and Yukio, didn't get incinerated upon possession. Shiro could hold on briefly because he was created as a vessel for Azazel.
|Goro||Body Possessed during Ego sprouting||Unknown|
|Yuri Egin (Anime Only)||Willingly allowed Satan to share her body; possession ended so Satan could find vessel to help save her||Deceased|
|Wolf (Anime Only)||Unknown||Unknown|
|Igor Neuhaus||Possessed during Blue Night||Active|
|Ernst Frederik Egin (Anime Only)||Possessed during Blue Night||Deceased|
|Shiro Fujimoto||Possessed when emotionally unstable||Deceased|
|Yukio Okumura (Anime Only)||Possessed when in anguish over learning about the truth about his mother.||Active|
When first introduced, Satan's mannerisms and laughter bordered on insanity and he enjoyed it when Rin screamed for help while being sucked into the Gehenna Gate. This reveals that his cruel and reckless personality doesn't stop even before his own family. It is further emphasized when Satan said that he created Rin out of mere boredom and after that realized that Rin is exactly what he needed to conquer Assiah as Rin is a human born in Assiah but as Satan's offspring bears Satan's blood.
In the manga, upon taking over Goro's body and developing his own conciousness, Satan, at the time known as Rinka was described by Yuri as being like a very powerful baby. He lacked any any real moral compass and had no concept of right or wrong, thus he did not comprehend the moral ramifications of killing and wanton destruction. Despite this, he clearly cared for Yuri. She was the only one he would listen to and he was shown to be immediately jealous apon meeting Shirou. Satan was also shown to be extremely competitive, attempting to kill Shirou after losing a game to him vowing to beat him. He also had an incalcuable intellect as he learned at an accelerated rate.
In the anime he is shown to have been in love with Yuri and seeking to realize her dream of humans and Demons coexisting he attempted to merge Assiah and Gehenna. Ironically enough, he shows no remorse for possessing Yukio and trying to kill Rin even though Yuri loved both of her sons more than anything.
Record of Satan's existence is actually quite short, with his ego only sprouting a few years before the Blue Night. Before, he appeared as nothing more than small specs of blue light, and was called a "rinka", along with many other names depending on region. He would randomly appear around the world with no reasoning, thus causing many to have different interpretations of him. Many different descriptions of a rinka included dead souls, the fires of hell, fairies, and tempory forms of sacred foxes. During this time, Rinka had no conscious.
Rinka was first fully brought into Assiah 16 years ago. His ego sprouted into the strongest clone the research facility made, that clone was meant for Lucifer but unbeknowst to the other Demon Kings, they had no idea who it was that possessed the body meant for Lucifer. By the time they realised, it was too late. Rinka escaped the facility and quickly found Yuri. After being taken back to the facility, he was looked after by Yuri, as she was the only one he would listen to. Yuri would being him books and toys, but after 1 year and 3 months he started becoming bored with them. In an attempt to expand how world view, Yuri brought Shirou along with her to play with Rinka. The demon was immediately ditrautful of Shirou and grew to hate the exorcist quickly. The next day, Rinka took a guard hostage and demanded to be given more books for the guard's safety. After several hours Yuri approached Rinka in an attempt to convince him to let the guard go, only for the demon to nonchalantly kill the guard and explain to Yuri that he had come to the conclusion the at he was the Demon God Satan.
True Cross Academy arc
Taking advantage of Shiro Fujimoto's temporary weakness after his argument with Rin Okumura, in which the latter told the former that he shouldn't pretend to be his father, Satan possesses the priest. Grinning, he muses on how he has waited for the day when he would finally see his son, before breaking into hysterical laughter and denying the entire thing. He then tells Rin to be happy, as he has come all this way to see him in person. When the boy realizes that he is a Demon, Satan introduces himself, but remarks that he doesn't have time to continue their "touching reunion", as Fujimoto's body won't last much longer under the current circumstances. He then rips off several of the priest's fingers to illustrate his point, using the blood from the severed digits to summon a Gehenna Gate. He tells Rin that he is the only Demon that is able to create this apparatus, and that he will use it in order to drag Rin back to Gehenna with him.
Taking note of Kurikara, Satan picks up the sword, informing Rin that he will need to destroy it first before they can make their trip. When the teenager reacts violently to Satan's approaches by summoning his flames, the Demon king merely laughs off the attempt, grabbing him by the collar and dragging him over to the Gate. As he does so, he explains how even with his supreme power, he is unable to remain indefinitely in Assiah, as everything he possesses ultimately is destroyed. Stating that it was nothing but a whim that prompted him to create Rin, he goes on to say how much of a masterstroke that action actually was, as he now has exactly what he needs to make Assiah his. He then tosses Rin into the Gate, laughing uproariously as he declares that the boy will be reborn, welcoming him to Gehenna. Before Satan's plan could be completely successful, however, he is stopped by the remaining consciousness of Fujimoto, and curses the priest as he temporarily seizes control of his body, grasping his Exorcist pin and thrusting it into himself. As Fujimoto claims Rin as his son, and that he is going to take him back, Satan gleefully exclaims how wonderful it is that Fujimoto plans to commit suicide, as no matter what he does, nothing can escape the Gehenna Gate. After this, Satan is sent back to Gehenna as Fujimoto dies, leaving Rin to escape the Gate by himself.
Blue Night Investigation Arc
Satan is first seen as a small blue flame who often played with Yuri as very young child. Mephisto notes that Satan probably couldn't tell that he was playing with her since his ego had not sprouted, but does not the fact that she is most likely his first intelligent interaction. During the instance he is seen playing Yuri, she is suddenly called to return home by her guardians. Not too long after this, the shelter in which she said is found caught on fire, with the bodies of guardians found burned to death. It can be implied that Satan had burnt the area. He is quite absent after this, but still seems to follow Yuri around, as he would appear randomly throughout her years at True Cross.
Satan makes another major appearance when Yuri is 16 years old. The girl and Shiro have an argument in Mexico after Shiro elbows Rick in the face and proceeds to degrade him. This angers Yuri, who eventually slaps the exorcist. Shiro tries to retaliate, but is stopped as a blue flame suddenly appears and guards Yuri. Everyone around is shocked at the incident, but eventually lets it go.
Powers & Abilities
As the God of Gehenna, Satan is the strongest Demon in existence. His powers are not yet revealed except that he can summon the Gehenna Gate. Like any other Demon, Satan has the power to possess a human body but only for a moment as everything he touches in the world of Assiah is doomed to destruction, with even the strongest bodies only lasting five minutes at most
As the God of all Demons, Satan possess immense strength, giving him the ability to carelessly drag someone like Rin with ease and rip off his own fingers with no difficulty.
Satan has the ability to summon the Gehenna Gate; in the anime, it is implied that he's the only being in Gehenna powerful enough to summon and open the complete and full form of the Gehenna Gate, although other Demons are able to by conjuring a lesser or an incomplete version of the gate. This Demonic door needs blood in order to link Gehenna and Assiah. It's size, appearance, and even abilities depend on the amount of blood offered as a sacrifice.
Being his blood, Rin was sacrificed by the True Cross Order to use his blood to create a large Gehenna Gate which requires a large amount of Demon blood. Combining Yukio's blood with Rin's, the power dramatically increases, creating multiple Gehenna Gates to create a large portal to Assiah.
After his defeat from Rin and Yukio, Satan was rejected from his vessel, but possessed and took control of Gehenna Gate, giving more abilities to send gate Demons, shoot beams from its eyes, and rise into the sky so it can attack the city. This Gate is regenerative and able to withstand Rin's flames. Its weakness however is its heart which Yukio and Rin pierce through to destroy Gehenna Gate completely.
Like Rin, Satan is highly durable; maybe even more than Rin, due to his being Rin's father and a demon. It was shown that he could stand a fight against his son's friends without feeling exhausted. The same thing happened when he faced Shura's power as well. However, unlike Rin who cannot use his flame in a long period of time with ease and has to practise for that, Satan does not seem to have any difficulty in this.
Just as his son, Satan can control and manipulate blue flames at will. He is able to ignite his victims in blue flame by spontaneous combustion (activated by eye contact). He also has the ability to shoot multiple fireballs from his palm during his battle with Shura and can burn out any barrier that was created by the Exwires. When fighting Rin, he ignites him with his flames but Rin, however, appears immune to it. This was only shown in the anime.
Satan has the special ability to generate powerful wind from his own voice. It was shown in the anime when he told Rin to 'shut up'; a great wave of hurricane suddenly emerged from his deep voice. He did the same when he knocked out all Rin's friends as they were trying to fight him.
Satan is a very fast opponent but the limits of this ability has not been revealed yet. However, it has been seen that when he was trying to attack Rin, he initially laughed at him before using a high speed rush to get to him; a proof that he may have this kind of ability.
- In the Abrahamic Religions, Satan is the name given to a fallen angel who fell out of God's favor after waging a war in Heaven. He is also the personification of all things evil, as he leads humanity astray with deception and temptation.
- (To Rin Okumura) "I'm a perfect entity with ultimate power, but there's one thing I lack. Do you know what it is? It's a substance in Assiah strong enough to contain me! Everything in this world that I touched is doomed for destruction!"
- (To Shiro) "Curses what do you think you're doing? ...So you mean to sacrifice your life for him? You astound me, you wretched priest. However, it's already too late. Gehenna Gate has taken a hold of you, and it will never let you go."
- (To Rin Okumura) "Oh, it was out of mere boredom that I created you... but I have since realised, it was a masterstroke! You exist in the world of Assiah... and yet you bear the blood... of the god of Gehenna...! You are exactly what I need to make Assiah mine!!"