TH👁️IR E Y👁️S

Everything we know about Diavolo so far, lore wise.

WARNING: SPOILERS FOR ALL SEASONS

➤ He's the prince and future king of the Devildom, and the founder of RAD — the Royal Academy of Diavolo — taking the position of Student Council President. (swd: 1-1)

➤ He created the exchange program as a first step towards his goal of strengthening the relationships between the three realms and forming an allyship between angels, demons and humans. (swd: 1-1)

➤ He has the ability to discern the truth from the lie. (swd: 4-1)

➤ He was the one to step in and save MC from being attacked by Lucifer in the underground tomb. (swd: 6-6)

➤ He hasn't seen his father in several centuries now and only knows that the Demon King is somewhere in the bottom of the Devildom. (swd: 7-10)

➤ Unlike Lucifer, he saw MC's pacts with the brothers as a good thing from the very beginning. To him, MC's pacts were proof that demons and humans could put aside their differences and actually form bonds together. And that made him happy, considering it was all he wanted with the exchange program. (swd: 8-19)

➤ Before, citizens of the Devildom were allowed to travel to the Human World whenever they wished through passages spread through the kingdom, but Diavolo changed that after taking over the throne. Now, those passages are blocked and the only way demons can use them is by getting permission from Diavolo, Lucifer, or Barbatos - the only demons apart from his father who are allowed to use them freely. (swd: 11-4)

➤ He ordered Barbatos to imprison Belphegor in the castle and put Lucifer under house arrest for hiding the youngest from him even though he had planned treason. But later, he admitted to having known about it beforehand. "...Truth be told, I knew. I knew you were hiding Belphegor, and I knew why. Your loyalty to me forced you to deceive your brothers, and I knew that was a source of guilt. I saw how you struggled with it-how hard it was being pulled in two directions at once. And it made me sad.” (swd: 13-14 and 15-12)

➤ When the eight siblings were cast down to the Devildom and Lilith was in the verge of death from the battle, Lucifer begged Diavolo to save her and he did, having her reborn in the Human World with no memories of her previous life. This came with a cost, however, said cost being Lucifer's loyalty to the prince for the rest of time. (swd: 14-10 and 15-7)

➤ He refused to free Belphegor at first, but eventually made a deal with MC: to release him from prison if they went back in time with the help of Barbatos' powers and found out who had freed him in the first place. (swd: 15-14)

➤ He had Barbatos trace down MC's bloodline and found out that they were a descendant of Lilith because of it. (swd: 16-15)

➤ On his birthday he decided to not only celebrate himself but also MC, to give them a "late welcome party" and show appreciation for them after everything that had happened. (swd: 18-A)

➤ He was suspicious of Solomon for suddenly showing up in the Devildom with MC unannounced (swd: 21-4) but arranged things so they would be able to stay for a while. (swd: 22-19)

➤ When Lucifer and his siblings fell Diavolo found them in the colosseum, and every now and then he finds himself going there and pondering over his past decisions and wondering if they were the correct ones after all. (swd: 24-13)

➤ He was the first Solomon talked to about his suspicions that MC was connected to the natural disasters happening in ancient locations around the realms, and for a while only the two of them and Barbatos knew about it (swd: 37-4), since Diavolo decided to keep it a secret from everyone else until he had proof of MC's powers being harmful to the realms (swd: hard mode, 32-16).

➤ He had MC undergo the standard magic exams that demons students are given at RAD, and although he initially told MC it was to help them learn more about the powers demons possess and how to control them (swd: 29-5), it was actually a test to see if their magic was as powerful as Solomon suspected. The sorcerer was proven right when MC passed each of them. (swd: 37-4)

➤ His secrecy and unusual reliance on Solomon caused a strain on his relationship with Lucifer, as the eldest knew that Diavolo was hiding something but refused to tell him. They eventually had a conversation in the colosseum after RAD's exams week ended, where Lucifer directly enquired him about what was happening. Diavolo refused to tell him, saying it wasn't "the right time" for him to know yet, and when Lucifer asked if whatever secret he was keeping involved MC the prince replied that he wasn't certain yet, further concerning him. (swd: 28-C)

➤ He's "not fond" of Simeon because he finds him difficult to deal with and told this to the angel's face while speaking to him. When Simeon asked Diavolo why he found him difficult to deal with, he explained that it's because angels never divulge anything about themselves or the Celestial Realm but are constantly inserting themselves into Devildom business, and he's especially not fond of Simeon because he hides his true intentions better than any angel Diavolo has ever met. (swd: Hard Mode, 31-16) He's so unfond of Simeon that when he finally decided to make him aware of MC's powers being a threat to the three realms, he asked Solomon to break the news instead of doing it himself. (swd: Hard Mode, 32-16)

➤ He eventually decided to tell Lucifer about MC’s situation and through text apologized to the Avatar of Pride for leaving him in the dark for so long and asked him to meet him so he could finally let him in on what was happening (swd: hard mode, 36-16). Unfortunately that meeting never happened, since Lucifer ended up affected by MC’s powers and lost his memories before Diavolo could explain anything to him. (swd chat: the fantastic three, "untitled")

➤ Finally breaking the news to everyone, he and Solomon told the others everything, from the moment the sorcerer started growing suspicions about MC's powers to the moment that their powers struck Lucifer and he lost his memories. They also presented their only solution(s): to sever MC's pacts with the Night Dagger in order to break their magical connections to the brothers and make them an avarage human again. There was another solution: to stabilize MC's magic with the Ring of Light - the counterpart to the Ring of Wisdom that once belonged to Lucifer - but it was discarded right away as the ring had been lost in the Great Celestial War and no one knew its whereabouts. (swd: 37-9)

➤ Once everyone knew the whole story, he apologized to MC for not finding another way to prevent their magic from causing massive destruction to the realms, since he knew neither MC or the brothers wanted to sever their pacts with the each other. (swd: 37-9)

➤ When all things ended well and MC was able to get their powers under control without using the Night Dagger thanks to the Ring of Light that Simeon found just in time, Diavolo organized a party to honor MC and celebrate the victory. (swd: 39-1)

➤ He showed no surprise when MC expressed wanting to stay in the Devildom instead of going back to the Human World but still refused the request. Later, he explained why: "I don't want MC to be a demon...or an angel, for that matter. No, I want MC to be a human. A human who understands us, and who works together with Solomon to shepherd the human world toward a better future… Someday I'd like MC to work alongside me to bring harmony to the three worlds. Which is precisely why I won't allow you to be stuck here in the Devildom, MC. I want you to learn more about the three worlds and to understand each of them better... The human world, the Devildom, and the Celestial Realm.” (swd: 39-10 and 40-22)

➤ He couldn't accompany the brothers on their vacation to the Human World at first because of work and told MC he often found it hard to get things done with everything being so quiet since the others weren't in the Devildom with him. (swd: 42-18)

➤ When tasked with the over the kingdom in his father's absence, the first thing Diavolo did was to start conciliating with the Celestial Realm to end the conflict between the two realms. For this, he started having meetings with high-ranking angels to explain his plans and hopefully reach an agreement of peace between the realms. That was how he met Lucifer, when the angel came down the Devildom to hear what he had to say. (swd: 44-12, 44-15 and swd card: Lucifer, "Glory Days")

➤ He's a majority shareholder of the Three-Legged Crow Group otherwise called Yatagarasu, the largest company in the Devildom that's been expanding business in the Human World with their technology devices. (swd: 47-11)

➤ He has admitted to feeling jealous of the bond MC and the brothers share multiple times. On one hand, he's jealous of the brothers for being so close to MC, and on the other, he's jealous of MC for managing to become a part of their family so easily. “I wonder, when was it, exactly? When did you and your brothers become so very important to me? I thought I'd never be able to become ‘one of you.’ It seemed ridiculous to even try because it was just obvious that I couldn't. But then MC did just that... Effortlessly fitting in with the seven of you to become just another one of the gang. More than that, actually. MC is part of your family now. And when I saw that, it may have made me a little jealous. And while I haven't wanted to admit it to myself up to now...the truth is, I think I was lonely.” (swd: 48-12 and Hard Mode, 50-16)

➤ His mother died shortly after giving birth to him and he was raised by his father who was very strict and gave him a sheltered childhood, so much so he rarely ever left the castle. (swd: 56-18)

➤ He met Barbatos for the first time when he was still a child and the older demon was the first person he met from outside the castle. The older demon amazed him with stories of the outside world, and little Diavolo begged him to stay with him, getting to the point of threatening not to assume his position of king in the future if Barbatos left him. (swd: 56-18)

➤ When the brothers at the farewell party asked if they could make MC “officially part of the family” by marrying them, Diavolo explained that demons and humans aren't able to marry yet but that he'll do everything he can so one day that'll be possible. “MC, you aren't aware of this, but some bad blood still exists between our three worlds. No matter how much all of you may want this to happen, it's not something I have the power to do on my own. [...] However, my ultimate goal is to eliminate these barriers someday. And I will do everything in my power to make sure that happens.” (swd: 60-15)

➤ A while after MC left Diavolo sent them a magic letter and asked them to come to the Devildom for a third time because he had something important to discuss with them. (swd: 61-4) And that something turned out to be a request for MC to participate in the exchange program for a second time and an invitation for them to be a new member of the student council. (swd: 62-17)

➤ The intentions for this second try of the exchange program was mostly the same but now with a different approach, as Diavolo explained to everyone in the meeting then: “Our last exchange program was meant to provide an opportunity for cultural exchange among the inhabitants of all three worlds. But nothing more than that. Think of it as merely a starting point on the path to mutual understanding. But this time, the goal of the program is to make a stronger case for mutual understanding. Directed at everyone both inside and outside of the Devildom.” (swd: 62-17)

➤ He's known Mephistopheles ever since they were children. (nb: 13-11)

➤ Initially, his father was the main reason why he was determined to be a good king and why he even rescued the brothers in the first place. He craved the king's approval, wanted to live up to his name, show himself worthy of the throne, and eventually surpass him. He was forced to face this truth when he was younger during his last trial of the Kingsblood Crucible - a traditional ritual that demons of royalty have to go through before they take the throne. (nb: 14-7)

➤ After MC was officially appointed as the 9th member of the Student Council and the short-term exchange program ended, he gave them an “entry permit” so they could travel from the Human World to the Devildom whenever they wanted. (swd: 80-22)

Mephisto climbing his way to become one of my favorites characters after lesson 31:

Not them getting together to take revenge on Mephisto

OMNB - LESSON 26

This moment was pretty sweet, we don't usually see the brothers getting upset on Satan's behalf

Also I refuse to believe that this man didn't laugh or at least crack a little smile entering that room to see Mephisto pathetically tied up in spider's web from a curse Satan put on him.

You just KNOW that he was ( secretly ) super proud of Satan for it, even while lecturing him about it.

As. He. Fucking. Should.

Barbatos: You're choosing to have MC and Mephistopheles on the same team during the competition?

Diavolo: Yes!

Barbatos: Young Master, you must realize that those two despise one another and are always at each other's throats, correct?

Diavolo: I do, but that's exactly why I made them a team! This is their chance to overcome their differences and find that they don't hate each other as much as they thought! Maybe they'll even become friends...!

Barbatos: *chuckles* I see...

Diavolo: You don't think it'll work, do you...?

Barbatos: Let's just say I don't have as much faith in the plan as you do...

A few days later, during the competition:

Mephisto, for the 6899th time that morning: That's not how you do it. You have to- Oh my devils, you're doing everything wrong! If you at least followed what I say-

MC: *annoyed because because he keeps complaining no matter what they do* Sorry, but I'm not taking instructions from someone that looks like a child's failed attempt at drawing Lucifer for the first time!

Mephisto: You excuse of a human...*summons the royal sword out of thin air*

MC: *pulls two magic daggers from their pockets, assuming a fighting stance*

Diavolo, watching from afar: I think this might be our time to intervene.

Mammon: Ya think?!

Barbatos: *sighs* I knew this wouldn't go well...

Lesson 19 hard mode in a nutshell: