op, p l e a s e do this one.
gn-mc is a great fighter according to their profile, but everyone severely underestimates them, since they’re kinda short and they’re thinking it’s to human standards. as soon as they come though the three (Diavolo, Barbatos, Lucifer) realise that the number of fights have gone down, and that RAD is a lot more quiet. Apparently mc had fought all the trouble makers or scary students on a whim, and has forced like 30+ scary demons into pacts, and plans to conquer RAD’s bad students. on top of that, they’re just like “one day i’ll beat the shit out of diavolo too fair and square, and conquer him as well.” for the brothers and undateables. bonus if mc said they only started their “conquest” because someone tried to bully Luke, so they decided to just conquer the demons for him like a good? older sibling
Holy shit OP this is what I signed up for when I started doing headcanons. Recently I’ve been working on my actual novel but I am still writing these out! I decided to answer this first because the creativity just HIT me.
The part that killed me is just how they did it for luke, I love him like my own son. Also side note the goth theme on tumblr hits different I really like. WARNING - a little bit of language, and violence.
Everyone reacting to GN!MC “conquering” RAD’s demons
He had chosen you and noticed your profile, thinking that is was almost cute humans would consider a tiny thing like you strong.
He immediately brushed you off when he saw how close you were to the chihuahua, thinking that you too, are just like a tiny chihuahua then.
But he soon hears less and less about fights going around, and even Diavolo investigates with him, and he is beyond shocked. He severely underestimated you.
He finds out because he forced some lesser demons to talk, and they were in tears saying you forced them to make a pact with you each time they lose, and by your order they weren’t allowed to fight students anymore, or else you’d punish them.
Although it was the truth he didn’t quite believe it, so they followed you around for a day before realising it absolutely was, you kicked ass so hard, the demon was crying and unrecognisable, and you forced him into a pact while snot was even coming out his nose.
He then sees you open the door behind you and take Luke’s hand before walking away from the bloody scene you had just caused. He was slightly angry and a bit intimidated, how did you, a tiny human do that?
When he confronted you about it, you just held onto his shoulders tightly, answering with “I’ll conquer you too, I’ll conquer Diavolo, I’ll conquer all of RAD, fucker. I am going to protect this child with my life.”
He was about to argue back, possibly attack you, but according to all the students investigated, you had well over 50 pact marks by now, and Diavolo found it amusing, so you were let off with that.
He swears he won’t submit to you, and has to stay on high defense because even at the HOL you will try to attack him with murderous intent to get the pact. 0/10, wants a new exchange students.
He was the first one you made a pact with, and afterwards he started following you around like a dog, despite literally calling Luke a dog.
He knew you were a good fighter since you kept saying so, but he kept telling you demons were another level, and you should be glad to have him.
You and Luke hung around a lot, while Mammon thirdwheeled, and finally came the day of your first fight. Mammon was ready to defend you, but you ordered him to sit as you beat the literal fuck out of the demon.
Mammon couldn’t tell if that was a lesser demon or a dismembered corpse at that point, and covered Luke due to all of their screaming in agony. When you were done, you kicked their head into a wall and demanded a pact, making him slightly pouty but happy he’s alive:
Getting the pact, you left and gave a head pat to both Luke and Mammon, telling them that they’re safe with you. Mammon didn’t like it at first but then he loved it.
It didn’t take Lucifer long to find out, and when you told him with such confidence that you’d “conquer all of RAD, including Diavolo” he was like woah!! You’re going to die for that, but you’re amazing!!
And then you didn’t die, because Diavolo found it funny, and you were only serving justice to those who cause mayhem at the moment, so it was fine. He also accidentally finds out that you rival Lucifer in power, and absolutely won’t let Lucifer punish him, because in your words, “Mammon is my property now, whore.”
You were the only person to protect him, and he absolutely loves you, he may be weaker than you, but he loves staying by your side and saying he’d beat people up for you anyways.
Levi never really talked to you at first, nor found out about the incidents because he didn’t go to school, but when he heard Mammon talking about it he thought he was exaggerating a lot.
Even Lucifer said you were strong, but he refused to believe it at first, even denying the pact marks you had. Until you beat the life out of Levi during the TSL games.
He got angry at you and tried to kill you, so you ripped him apart, quite aggressively. He swore his tail had bite marks in them, and that he couldn’t see out of his left eye for a week. The icing on top was you demanding a pact from him. He finally believed.
After you calmed, he made a pact with you, and was now afraid of you, until you comforted and apologized to him, telling him he did try to kill you first.
When Luke comes over one day, you invite him into Levi’s room, no permission, and start to talk, and when Levi tries to make fun of him, Mammon shuts his mouth.
“Luke is the whole reason they decided to start their conquest, the whole school knows that by now!” Mammon shushed him, and Levi began feeling a little jealous that the chihuahua got more of your attention than him. But when he hears that you ALSO want to conquer Diavolo, he’s just like !?!!??? You’re crazy.
But more than that you’re like some over powered anime protagonist who got sucked into a different world with over powered plot armor, Levi thought, and he really liked it.
Begs you to come with him when he’s trying to buy stuff in lines, so anyone who tries to cut gets the life beat out of them when they do.
Absolutely member #2 of your fan boy club, Diavolo being the first one in it.
He thinks oh yeah, you can fight sure. But when he witnesses it he absolutely loses his mind. A human shouldn’t be that strong, but the way you force a pact mark from them, and even defended the tiny chihuahua before leaving, while being tiny yourself, he was interested in how your body worked.
But what really excited him and made him like you is when Lucifer entered the room and you sent a flying kick to him, putting up a harsh fight as well, before you break the table when you were knocked into it, calling it a tie.
“I swear one day I’ll conquer you and force you to make a pact with me. I’ll wipe that smug look off your face, fucker. And once I do that, I’ll beat the shit out of your prince, too.” You spat, getting up and holding your back.
So now you went from protecting the chihuahua to devildom domination? Basically asks you to make a pact with him so you can use him to fight Lucifer. When you tell him you want a fair fight, and that you’ll beat Lucifer yourself, he’s just so excited because you held your own for five minutes, and Lucifer can’t even kill you!
Literally tags along each time you decided to fight Lucifer and cheers you on so hard. Will purposely try to make you and Lucifer run into each other at the halls, so you automatically try to hurt him.
Please tell him not to eat so much popcorn, we know the show is good but it’s like he has boxes of them now knowing you’re hating? on Lucifer like him.
Has absolutely freaked out and began cowering in a corner, shaking, begging you anywhere but the face.
He came to watch the show of you beating up a demon, not realizing it was you at first. When he did, he was so shocked and got closer to make sure.
You mistook him for the demon’s crew who made fun of look and tried to attack, seeing red. He held his own for a minute, before you almost rip off his wing in one swing.
He’s begging for forgiveness like the demons, despite not doing anything wrong at all. When you calm and realize it’s just human, you make the other demons unrecognizable and get your pacts, before making your way to him.
He’s just crying not his face, while you just say “Pact mark.” Pointing out you won fair and square against him, too.
He gives it too you beyond willingly, just not his face, he doesn’t even think twice. Nodding, you take Luke’s hand and leave.
He has to leave too for then next class, but then sees Lucifer, Diavolo, and Barbatos confront you.
Is afraid for you but then you literally punch Lucifer and tell him you’ll conquer him, and then turn to Diavolo and declare his ass as your own, making Asmo secretly swoon but worried.
Actively tried to avoid you while at the HOL for awhile, but noticing your docile nature when you’re not fighting, he felt a little comfortable with you, and right now his only concern is how many callouses your hands are getting from punching thick skulls.
This man wanted to believe you when you said you were a strong fighter in passing conversation with him, but he just couldn’t. You were the tiniest creature he’d ever seen, and he was so sure you’d crush under one of his hugs.
He heard you were protecting Luke from the whispers of lesser demons, but he didn’t think it was through fighting.
This all changes when on his way to practice, he watches you beat up one of his teammates so hard they’re crying, they’re so huge, and yet lost to you, and the fact you sent him flying and cracked a wall, by one kick.
When you said you wanted a pact mark, he was shocked the rumors were true. On top of that, Luke was near by holding a cake he planned to give Beel as thanks for something he did for him earlier that week.
He watched you wipe the blood off your hand and pat Luke’s head, with a gentle smile. When he came in, Luke ran to him and gave him the cake, and he learned everything.
You were the one subduing the demons around here, big or small, and even protected Luke. He even learned that you challenge three totally strong demons, Lucifer, Barbatos, and Diavolo.
He totally believed you could do it now, with what he just witnessed. He’s seen his fair share of fights with egotistical demons thinking they’re so tough just because they play sports, and he’s seen guys at the gym, you were beyond that.
You had speed, strength, and great perception. Wasn’t even mad that practice was delayed, and began going to the gym with you, and will happily play with Luke too, another older sibling figure for Luke.
When he exited the attic and tried to kill you he watch his brothers grab popcorn from the sidelines, as they said to him enjoy dying.
He was confused at first, but then got the LIVING HELL beat out of him, oh how the turns have tabled. He intended to murder you, but you nearly killed him.
You forced a pact out of him as well, kicking him repeatedly where the sun doesn’t shine until he agreed, understanding why even Lucifer stood back. It’s not because they wanted you dead, it’s because they couldn’t stop you.
When he gains consciousness later, he finds out Lucifer is the only brother you haven’t made a pact with, and that you have over 80 pacts at this rate, and that you even planned to conquer Diavolo.
He thought it was stupid at first but after seeing you fight Lucifer, with no cheats just your normal hands for combat, while Lucifer was in demon form struggling, he understood he really liked you.
“Soooo... when are you beating the shit out of Diavolo?” He asks, and he also nearly makes the mistake of calling Luke a dog before Beel puts a hand over his mouth.
Jaw nearly drops and he loses his mind when he finds out you only started beating the shit out of people to make Luke happy.
This man just fucking cackles, like after watching you fight, he’s just in full tears from laughing. He’s just clapping, and telling you that’s amazing.
When Lucifer asked why you did it, you stood tall despite your short stature, and looked him in the eye with no fear. “I’ll beat each fucker who approached Luke, I’m going to defend him with all my fists got, and if you get in my way, I’ll do the same to you.” You said, before turning to Diavolo.
You walked up to him, and pulled his tie down so he could meet your eyes, and declared, “I’ll even beat the shit out of and conquer you too, one day, prince. I’ll be the ruler of this place one day. Prepare yourself for that day, until then, I won’t stop:”
This makes him laugh, not belittling you, but telling you he can’t wait, and he hopes that day comes soon, because he wants to fight you as well, and he hopes you hold nothing back against him.
He loves how strong you are, he loves how you want to protect Luke, he loves that you only did it to protect, and didn’t even bother to summon a demon, you did it with your own style. That took guts, confidence, and the fact you told him of all people with that confidence you would one day conquer him, his heart fluttered.
He would definitely start watching over you, and probably fan boy over you. The first person to ever force the prince of the Devildom to lower himself; and they even declared they would be the one to make him their’s, by forming a pact mark. It was honestly amazing to him, and he likes it.
He really should of seen this coming, a new fighting student, who was clinging to Luke protectively, and suddenly all the bad demons were being silenced.
Guess there’s no need for his torture chamber anymore, you’re much more feral than whatever he does, he just needs to sick you on them.
Joking aside, he doesn’t really take it too seriously. It’s great you can get a lot of pacts, and defend yourself, and even want to conquer Diavolo by forcing him to give you a pact mark, but he knows you’re still no match for him yet.
To get to Diavolo, you’d need to beat him up, and he’s a bit of a harder fight than Lucifer, by that he means a lot, he won’t even flinch if you bite his tail when he grabs you by it and puts you out the room, with a smile on his face.
It’s become a game at this point for the both of you to try and fight each other, you trying hard to get a pact mark out of him. He even offered it to you at one point, but you told him you wanted to win it fair and square, and he’s just in love with you even more because of that.
He’s pretty much a dad to Luke, so he appreciates how kind you are to him, and appreciates how you have your own set of morals for fighting, making him know that if Diavolo were to ever make a pact mark with you, it would all be fine.
“Hey... are you sure you’re not actually the demon?” Solomon asks you, looking at the sheer amount of pact marks on your body, one week after coming to the devildom.
He’s seriously impressed by you, considering how easily you beat up demons without any weapons, magic, or underhanded tactics. You simply use your fists and legs, sometimes your head, but you get the job done scarily.
He’s even more impressed when he finds out the reason, you were visiting purgatory hall and Luke was being rather loud. “I can’t believe that’s the 7th demon this week that fought with you! You’re just so cool, you’re so strong! Thank you for protecting me!”
Probably wants to try to enhance your strength with a potion, and offers it to you when you try to have your epic showdown with Diavolo, claiming he is the boss and Barbatos and Lucifer were his right hand men who dragged Luke into this mess.
You decline though, wanting it to be fair and square. Truly admires yet fears you. But then again, i don’t think you stabbing him would making him afraid of you. I don’t think this man can feel it at all, unless it was you dying.
Anyways, he’s delighted to ask the demons you make pacts with to make pacts with him as well.
Nearly loses his mind at first. He’s so concerned if you’re hurt,, but then he’s just like wait what.
Luke had told Simeon all about it when he reached purgatory hall, about how you beat up a demon for him, and even promised to always protect him. Simeon is really distraught you may of been hurt protecting Luke while he was busy.
But then Luke tells him about how you forced a pact mark out of the demon, and you didn’t even break a sweat, and that is was the coolest.
He doesn’t tell Diavolo about this thinking it was just a one time thing, and tries to watch over you two more. But then he sees you and he’s literally just frozen.
Humans aren’t that powerful right? And when Lucifer Diavolo finally confronts you about it, he watches as you just stare him down and declare that you’re going to conquer him as well, to make Luke feel happy and safe in devildom.
Needless to say Simeon is extremely panicked about your well-being, but extremely happy Luke is protected by someone so kind to him. Probably doesn’t approve of the violence, but Luke adores you.
The first time you met him you told him not to worry about the demons, because if they ever bullied him you would beat the life out of them.
He thought you were just saying that, and he said that he too would protect you, which you found extremely adorable and nearly went “I’m taking this kid home with me and he’s my child now.” not that anyone could physically stop you.
He found out you were actually sincere about it when the two of you were alone in RAD’s hallway, trying to leave for purgatory hall since he invited you over.
You two were stopped by a demon, who tried picking a fight on easy prey, and it was quite frankly, the worst mistake of his life, ever.
You beat the LIVING SHIT out of him, and even told Luke to look away, because this man was beyond recognisable, because you were so small you could easily duck and move fast, so the demon didn’t even land one hit on you.
Just because he’s a demon, doesn’t mean his stamina is forever you figured, and beat him up, forcing him to make a pact with you. You had one with Mammon already, so you knew how it worked, especially knew you could have multiple due to Solomon.
When it was over, you told Luke he could look, and there was zero damage to you and he was just like woah!! You’re so cool! And from then on you stuck close to him, literally demolishing any demon he thought looked scary, or just stared at him for too long.
When Diavolo comforted you about it, you stared him dead in the eyes saying “I would literally beat the shit out of you for Luke, so you better hope he starts liking the devildom soon, fucker.”
Diavolo laughed and Luke insisted you didn’t have to go that far, but you just patted his head and said it was okay.
