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Greedy for all the money in the world. The scummy second-born.

"The scummy second-born who is greedy for all the money in the world. The witches are his big weakness."

Mammon is the Avatar of Greed and is the second oldest of the seven demon brothers, and the first to enter a pact with MC. He is one of the main characters in Obey Me! One Master to Rule Them All that is involved in the intimacy system of the game; therefore, users can interact and raise their relationship with him.


Mammon has white, messy hair, tanned skin, and blue and yellow gradient eyes. He has on gold stud earrings and two silver rings on his ring and pinky finger on his right hand. Like all of the demon brothers, Mammon paints his nails and specifically wears white nail polish.

Mammon and Satan are the only brothers whose final design didn't change from their concept arts.


True to his title of 'Avatar of Greed', Mammon is naturally greedy and always seeking out opportunities to profit without putting much work. According to the chat First Thing in the Morning, the first thing Mammon does every morning is check his stocks. In Beelzebub's Devilgram Unspoken Affection, the results of the D.D.D. app "Demon Brain Scan" are that 90% of Mammon's brain is taken up by "money."

Although he's the second eldest, he acts immaturely when he doesn't get his way and is the biggest troublemaker of the brothers. He's egotistic and prideful, though it seems that it is only a façade to cover up his soft nature. He often refers to himself as "Ore-sama" and "Mammon-sama". "-sama" is a Japanese honorific given to people worthy of the utmost respect, so Ore (crude pronoun for me, I) -sama is, essentially, "The Great Me".

Mammon is also quick to lie, but not very good at it; in many stories and chats, he stutters when he denies something (even while texting). He has a tendency to shout whenever he's angry or upset (which is most of the time) as well as growl when he's irritated. He often praises himself when he thinks any of the brothers compliments him (even if they aren't) and thrives on being complimented, especially by MC.

He acts impulsively and often speaks before he thinks. It's because of this that Lucifer takes great precautions and enforces multiple rules that inevitably inconvenience the rest of the brothers and MC. Despite his rashness, Mammon is sensitive to changes and highly empathetic; he's the first to notice if something is amiss with his brothers or MC.

He's generally the punching bag for his brothers, and Beelzebub claims that all Mammon's six brothers look down on him in Belphegor's Devilgram, Hatred. He often complains about this, but rarely fights back physically. While being the second-born means he has a great deal of power, he's not much of a fighter. His typical response when getting into trouble — be that with his brothers, people he owes money to, etc. — is to run away. He's considered to be one of the fastest demons, such that not even Lucifer nor Diavolo can match his speed. He also doesn't lose control of his powers as easily as some of his brothers, which is likely why Lucifer entrusted him as MC's guardian during their stay in the Devildom.

Whenever there's a crisis, he's generally quick to come up with a plan that often leads to dangerous results, as seen when he used Leviathan's new game Dogi✩Maji✩Memorium to work out Lucifer and Satan's differences (unaware that the game was a dating sim). He also can be quite skilled at mentally challenging tasks if he puts his mind to it. One example of this how he struggles with math homework in his Devilgram The Mammon Way, but has no trouble once he's calculating money.

When it comes to romantic relationships, according to him in the Who's Your Type? chat, he sees them as an investment of time and money and greatly dislikes partners that asks for either of them from him. According to Asmodeus in the Popular with the Ladies Devilgram, Mammon attracts the "sassy and outgoing" types.



  • As stated in Issue 5 of the RAD Newspaper, Mammon likes R&B music.
    • In the chat Let's Form a Band 2, he suggests that the brothers form a metal band, implying he also enjoys this type of music.
  • As the Avatar of Greed, Mammon enjoys both selling and possessing expensive and luxury items.
    • According to Issue 5 of the RAD Newspaper, the car in his room is a Demonio 666 Lexura.
      • This model of car is rare, and Mammon was only able to acquire it (unbeknownst to him) with Lucifer and Diavolo's help. (Lesson 38-5)
      • The laptop he uses for Student Council work has a Demonio 666 Lexura color scheme.
  • Mammon's favorite food is hell soy sauce flavor cup ramen.
    • He also likes dried blackbelly newt legs and fried scorpion sandwiches with vinegar and tartar sauce.
  • In the chat Cat Person or Dog Person?, Mammon says he's a cat person because he likes their aloof pride.


  • In Lesson 2-10, Asmodeus states that Mammon is not a morning demon.
  • Mammon hates anything scary-related such as horror movies and haunted houses, and tends to scare easily.
  • He has a strong dislike of witches, mainly because they exploit him for their gain.
  • In the Listen to Me Devilgram, it's revealed that Mammon hates the song "Corpse Rock."
  • In the chat Bath Time With Asmo 2, Mammon complains that the bath reeks of roses.



Mammon was originally an archangel that was under Michael's tutelage, but Michael couldn't handle his mischievous and rebellious nature. He was turned over to Lucifer, who managed to straighten him out, and Mammon's been loyal to him since. He was eventually promoted to the rank of throne and became Lucifer's assistant. He also used to watch over the younger angels such as Beelzebub, Belphegor, and Lilith, who always gave him a run-around.

He rallied with Lucifer and his brothers in the Great Celestial War, but when they lost and fell into the Devildom they became demons. It was during this time that he served as a strong support for Lucifer as they all tried to adjust to living in the Devildom. He also had a hand in "raising" Satan when he was born, but not much is known to how much he contributed.

In Lesson 11, Mammon claims to be well over 5,000 years old.

Mammon sometimes works as a model, at least once for the fashion magazine "Devil Style" published by Majolish.

Main Story and Events

For reasons unknown, Mammon did not appear during student council meeting when introducing MC. He is then called by MC's new D.D.D. and told that he's assigned to look after them by Lucifer during their stay in the Devildom. He refuses but then Lucifer threatens him and he quickly agrees. He shows no interest in the matter, claiming that he was only doing so as Lucifer had ordered it.

When guiding MC through the House of Lamentation, they run into Leviathan who, clearly upset, insisted Mammon hand over the money he owed him. Mammon pleaded with Leviathan to give him more time. One way or another, Mammon escapes the situation and runs away before Leviathan can further hound him.

Later on, Leviathan suggests that MC should make a pact with Mammon, so they would be able to order Mammon to give Leviathan his money back. However, to form the pact, Leviathan claims that MC will have to have a bargaining chip, something that Mammon would do anything to get his hands on. In this case, it is Mammon's credit card that Lucifer previously confiscated.

After successfully obtaining the credit card from the kitchen fridge, Mammon happens upon Leviathan and MC defrosting the card in the microwave. Mammon yells at them to stop microwaving the card, then begs for "Goldie" — his treasured credit card's nickname — to be given back to him. Leviathan states that in order for them to give back the card, Mammon will first have to make a pact with MC. Mammon, at first, refuses, but when threatened with Lucifer's name, hastily agrees to Leviathan's terms and officially makes a pact with MC.

After finding out about the incident, the other demon brothers tease and poke fun at Mammon over breakfast, calling him a "sorry excuse for a demon."

The morning after, MC tries to get past Lucifer and explore what's up the stairs, Mammon strikes up a conversation over breakfast, complaining about the fact that he's not allowed to eat MC. MC asks Mammon what's at the top of the stairs, who sighs and says that they are sticking their nose where it doesn't belong. Mammon refuses to tell MC any more about the stairs - until he is accused of being scared of Lucifer.

Finally, he cracks and informs MC of how to distract Lucifer, which requires a vinyl edition copy of the soundtrack from The Tale of the Seven Lords, currently in Leviathan's possession. MC then requests for Mammon to help, and he is forced to oblige. They go straight to Leviathan's room to ask him to lend them the soundtrack.

They are promptly denied entry to Leviathan's room, as he refuses to do them any favors. However, Solomon shows up, and with the aid of an authenticated secret phrase is granted entry to Leviathan's room. When Mammon and MC try to repeat the same secret phrase, they are denied access (even if MC chooses other options). Mammon comes to the conclusion that since Solomon was allowed in for being a Tale of the Seven Lords (TSL for short) nerd, the solution for MC is to become a TSL nerd themself.

Mammon is forced to join MC for the 12-hour TSL Full Series DVD Marathon Night. Beelzebub joins them for the food. Mammon ends up getting surprisingly attached to TSL and its characters, even ending up sobbing over the show. The day after, Mammon quizzes MC on their TSL knowledge. However, Leviathan appeared, claiming that he heard from Lucifer that MC was trying to suck up to him by becoming a TSL nerd. MC then challenges Leviathan to see who the bigger TSL fan was. At first, Leviathan is reluctant but agrees to the challenge after MC provokes him, calling him a chicken.

Later on after MC discloses Satan and Beelzebub's advice on making Leviathan jealous, Mammon boasts that they only did so because of him (though it's clearly not true). He agrees that MC needs to find someway to make his brother jealous and accompanies them to the one person that can.

At the TSL showdown, the questions that MC was given are significantly easier than the questions given to Leviathan. However, after three questions each, they are both tied on points. After pulling their trump card, Leviathan flies into an envious rage and proceeds to attack MC in his demon form. Mammon tries to save them, but slips up and not able to get there in time, allowing Lucifer time to step in and save MC.

Mammon is extremely frustrated that he wasn't the one to save MC, and while tending to their sprained wrist, he states that next time their life is in danger, he should be MC's only choice in terms of saving them.

When uncovered the mystery of Belphegor and the identity of the person in the attic, MC hears Lucifer and Beelzebub's discussion about Belphegor and his state in the human world with Beelzebub insisting that Lucifer should forgive their brother. MC discovers Mammon who was also eavesdropping on the two.

Mammon states that the brothers were once angels that resided in the Celestial Realm before they fell from grace. Back then, Lucifer loved and was especially fond of Beelzebub, Belphegor, and Lilith however that all changed when they arrived at the Devildom. After pledging loyalty to Diavolo, Lucifer would follow his desires no matter what the cost.

Lessons missing here...

In the chat Reporting In correlated to Lesson 32-16 Hard, Mammon mentions using crow familiars and talking with them. To date, this ability has not been brought up in the story since.


Main Character

At first, Mammon was annoyed with MC because he was forced to act as their guardian, even more so after they tricked him into a pact he only agreed to in order to get his credit card back from Leviathan. However, after spending more time together with MC, Mammon's feelings quickly deepened for them, though he tries to deny it when others point it out. He often has trouble expressing his feelings towards MC, becoming embarrassed or acting like he doesn't care. However, he often becomes jealous when someone else is taking up MC's attention or gets too close to them. He also keeps reminding MC (and everyone else) that he's the first demon MC made a pact with.

He's also interested in anything that could deepen the relationship between him and MC, as seen in Lesson 43 when he heard a rumor that the coffee at the Angel Halo's Café will make your crush fall madly in love with that person when they drink it. A similar situation occurred in the Devilgram Lemon Parfait Lovers, where if two people shared a lemon parfait at Lament's Café, they deepen their relationship.


Mammon seems to fear Lucifer's power, often trying to hide from him when he did something he knows that would upset Lucifer, but he tries to deny it whenever someone comments on it. Lucifer tends to question Mammon about the latest trouble he's gotten himself into and Mammon always tries to cover them up with lies - without success, as he ends up getting a punishment from Lucifer anyway. Mammon mentioned in many stories that Lucifer usually punishes him with skipping dinner or hanging him upside down. In Lesson 46-C, he stated that once Lucifer tickled him to where he laughed so hard he was humiliated.

Mammon also expresses annoyance towards Lucifer, sometimes poking fun of him when he thinks Lucifer isn't around. He dislikes that Lucifer often singles him out, even when he's not the one at fault.

In Lesson 27, they get into an argument which causes them to not speak to each other for several days, but the tension seems to disappear between them over time. Later, MC can tell Mammon that he should stand up to Lucifer, to which Mammon says he's tried before, but Lucifer always gets back at him and it just makes the problem even worse.

But in truth, as expressed by Asmodeus in Lesson 27, and even admitted by Mammon himself when he's forced to be honest (in Lesson 33), Mammon respects and admires Lucifer deeply. Back in the Celestial Realm, it was Lucifer who was able to get through to Mammon, who in turn followed Lucifer around and listened to his every word. He also knows Lucifer well, as in Lesson 28, he gives MC a hint about where Lucifer spends his time when he's upset.


While Mammon is not treated with respect by his younger brothers, he is still quite protective of them, especially Belphegor. In the chat An Unexpected Approach 1, when Lucifer demanded to know who broke one of the paintings in the House of Lamentation, Mammon took the blame (much the surprise of the brothers). However, as revealed in the second part of the chat, it turned out that Belphegor had knocked against the painting while half-asleep, causing it to break. In the Devilgram Paying Back What's Owed, Mammon also protected Belphegor from Lucifer when he skipped his classes at RAD to sleep all day, reminding him to ease up on his younger siblings as it was shortly after their fall from the Celestial Realm.


  • Mammon in Hebrew (ממון) means "money", and in Aramaic (מָמוֹנָא) means "profit, wealth".
  • Mammon states that he sleeps in the nude according to the chat Going Commando.
    • However, in his Christmas Tree animation, he's seen wearing a white sleeveless shirt and gray sweatpants.
  • His worst subject at RAD is hexes and curses.
  • In Lesson 63-4, Diavolo mentions that one of Mammon's trials to become a student council officer involved hellfire. He says that Mammon was almost roasted alive by the hellfire. Mammon got through the trial, but ended up with a badly scalded butt.

B's Log Surveys (April 2022 Issue)[1]

  • Personal Survey
    • Mammon's motto is "Money will make the Devil turn millstones."
    • The daily day section is procrastinating in MC's room every day.
    • He starts his baths by washing his head.
    • His future dream is to have a carefree, playful life.
    • If the Devildom disappears tomorrow, he wants to borrow as much money as he wants to spend and not have to pay it back.
  • Love Survey
    • Mammon is the active one when it comes to love.
    • He chose "other" on whether to bind his lover. (He wrote, "What do you want me to do? What did you say? Idiot!")
    • He easily forgets relationship anniversaries and special dates of remembrance.
    • He won't have days when he can't sleep thinking about the person he likes.
    • He is unable to express himself frankly.


  1. Translated by: Joye0627 https://twitter.com/HEAVENSYA