Mammon being greedy and constantly hoarding things away from all the others makes sense. That whole ‘scummy second born’ characteristic he has is what defines him as a demon and as a character. He’s the Embodiment of Greed. He does this shit all the time. The stealing, the lying, the gambling- all of it! Even his brothers seem to be under the impression that he doesn’t care about anyone else but himself. Which is just wrong, to put it in simple terms. Mammon does a lot for his family; they just fail to realise that.
Quite a few of the limited edition figurines and anime DVDs sitting on Levi’s shelf are from him, y’know? He made it seem like it was no big deal, that he found them lying around on the ground and he just happened to stumble across them and, out of the generosity of his own heart, handed them to his brother who was obviously excited to receive this kind of rare equipment. And the third born believed him because that sounds like a Mammon thing to do, since why else would he have such precious possessions within his reach? And give it to him no less, when he could’ve sold them for a lot of money??? In truth, Mammon probably went into debt trying to win these things and proceeded to spend weeks trying to get his hands on at least one so he could give the damn toy to his brother already. As an early birthday gift or something, idk what excuse he had in mind because he still has a reputation to uphold so he can’t be caught being a softie now, ya hear?!
Satan woke up with a cat in his room once. No tag, no owner. He swore that was the happiest day of his life simply because this random baby kitten found its way into his mess of a bedroom and he decided it was fate that such a wonderful thing were to happen. It took a while for Lucifer to agree but eventually he had to give in because Satan was being persistent, so he agreed on the condition that it’s just ONE cat and he better not come home to find a million of them sitting in the living room. Yeah, Mammon brought him that cat. He found it on the streets, in an empty alleyway or something, thought Satan might find it cute and then just…brought it home, I guess. And afterwards, he sneaked it into his brother’s room and pretended to act surprised the next day when its discovery was announced. He was also the one to convince Lucifer to let Satan keep it. Also, turns out the cat DID have an owner and Mammon just stole a pet, without even meaning to.
Asmo knows Mammon buys him make up kits and clothes from time to time. What he doesn’t know is that Mammon buys a lot of his jewellery too. To put it simply, the second eldest gets some really expensive looking-ass necklace, shoves it into a lower demon’s hands and tells him to go on and ‘give it to Asmo over there! He’s gonna love it, no need to thank me. You’re gonna earn some brownie points with the Avatar of Lust, good for you small, insignificant demon. Now just do it already!!’ Essentially, he’s too embarrassed to give these gifts himself but this is a regular occurrence that he forces onto others of lower status lol. Asmo comes home every time, flaunting this new gorgeous pair of earrings a fan of his gifted him and Mammon just goes ‘Whoa, that thing must be worth a fortune! Why dontcha hand it over to me, eh? C’mon, older brother privileges’ and the fifth born yells at him to stop being such a greedy asshole. The whole time he’s putting up a font so he doesn’t get found out because it would hurt his ego immensely if the others knew. Rinse and repeat after a couple of days….
The twins are easy because for Beel, all he needs to do is make him his favourite dish as often as possible and take him out to a few restaurants every once in a while to make him happy, which is good enough for Mammon, even if his wallet is screaming at him by the time they’re done. Belphie wouldn’t even notice this, but half of his pillows have either been ordered by Mammon on Akuzon or stolen from somewhere. I would be too afraid to ask where he stole such high quality pillows and blankets but yeah. Actually, those are two of the many things he does for the twins, the others including:
-Doing quite a bit of schoolwork for Belphie when he misses his classes (though he sometimes jokingly asks for compensation) or for Beel who stained his notes after salivating on them in class
-Sewing a few of Belphie’s pillows that he knows his brother used to like a lot before they ripped and had to be discarded of
-Always lets Beel know where his twin is because Belphie has a habit of falling asleep in random places and he doesn’t want Beel to worry about him when that happens so if he happens to spot him, he always tells Beel first so he can go and get him back to their room
-Etc…
Lucifer is last, mainly because Mammon doesn’t really give him a lot of physical gifts. I mean, some of the pricey alcohol the eldest has displayed in his office is from him but for Lucifer, Mammon was mostly there to provide him with emotional support. Especially after the fall happened and they all transformed into their ‘deformed’ demon forms for the first time, unrecognisable from the beautiful angels they once were before. That’s why Lucifer has so much trust in him-it’s because he knows Mammon is the most reliable demon out there and has always been there for him, quietly supporting him from the sidelines because he knew his brother had too much pride to ask for help from others. If I had to guess, Mammon would’ve had to pull Lucifer out of countless nervous breakdowns and self-pitying lines of thought, even more so after Lilith’s death. Honestly, Lucifer would’ve been totally lost and even more closed off than he is in the game at the moment if Mammon’s hadn’t been there for him. Actually, I guarantee you everyone would’ve fallen apart if Mammon was the one to die the Celestial War instead of their sister just because he’s the glue that’s holding them all together.
This post got really long but the point I’m trying to make is that Mammon loves his brothers and none of them really appreciate it enough because they’ve got this painted image of what they thought he should be like in their heads and therefore take all of his actions, as sincere as they may be, with a grain of salt. Obviously, these are just my HCs but I’m sure there are times where Mammon wonders if his siblings care for him at all or if they really dislike him as much as they let on. I know I would start thinking like that if I grew up in an environment where I’m constantly being insulted for the most minor of mistakes, since negative behaviour affects and sticks with you for a long time.