Lucifer

"The perfectly flawless but malicious sadist. The mighty first-born."

"'Known in the Devildom for being Diavolo's close friend and right-hand man. He is the oldest of the 7 demon brothers.'" "'He keeps the brothers together, by force if necessary.'"

Lucifer is the Avatar of Pride and is the oldest among the seven demon brothers. He is one of the main characters in Obey Me! One Master to Rule Them All that is also involved in the intimacy system of the game, therefore, users can interact and raise their relationship with him.

Appearance
Lucifer is the second tallest of the seven brothers, almost reaching Beelzebub's height. He has black hair with white tinted tips that's parted on the right side of his face, and black eyes with an outwards red gradient. Like all of the demon brothers, Lucifer paints his nails and specifically wears red nail polish.

Personality
The eldest of the brothers and hence is the leader of the household, Lucifer presents himself as a calm, composed, and intimidating person. His brothers frequently comment on how scary Lucifer can be. He is a very strict and unforgiving demon and does not hesitate when doling out punishments to his younger brothers. His sadism is evident in his punishments. However, despite being so uptight, he still makes the effort to joke around with his brothers, especially when it comes to teasing Mammon - who the other brothers say he has a soft spot for.

As the Avatar of Pride, he displays a tremendous sense of pride. Several examples include that when he was trapped inside Satan's body, he refused to let his brother give the speech in his body for he worried that Satan would ruin his reputation, and was displeased at the fact that he needed Satan (in Lucifer's body) in order to travel into the human world since he couldn't pass through the seal. One example was he kept Lilith's reincarnation a secret from his brothers for he felt that he alone should bear the responsibility. Another was when he cursed the attic, he was confident that MC wouldn't be able to see Belphegor.

Lucifer has sworn utmost loyalty to Diavolo, the future king of the Devildom and his closest friend, going thousands of years back. The demon brothers, especially Satan, often point out that Lucifer cares for nothing but Diavolo, and maintaining Diavolo's good image and reputation.

Being the oldest, Lucifer is also the strongest of the demon brothers. This was proven during the pillow fight in the Demon Castle, when, after losing his cool, bore a hole through one of the beds in throwing a pillow. In Lesson 9, when Satan and Lucifer switch bodies, Lucifer (in Satan's body) hits Mammon. However, Mammon laughs and comments that because of Lucifer being in Satan's body his strength has been cut to that of Satan's. Satan also implies that the brothers were put in order from oldest to youngest by strength and power rather than biological age, the oldest being the most powerful.

Lucifer also tends to be subtly overprotective of his brothers, proving in his own way that he cares for them. In Lesson 10, he sees that Satan is in danger of being attacked by game-Cerberus, and immediately threatened Cerberus, saying that he will do unspecified things should a finger be laid on Satan. However, his overprotective nature is often perceived as more suffocating and controlling, rather than comforting. Mammon frequently complains about this attitude of Lucifer's to MC and to the others. Despite it all, Lucifer only wants the best for his brothers.

As an angel, he used to speak quite rough if not rude, but was very direct with his feelings.

Main Story Normal
At the beginning of the game, Lucifer is introduced by Diavolo and proceeds to explain the details of the exchange program to MC. He states that, if anything shall happen to MC, it would be the student council's responsibility. He introduces several other characters as the story progresses.

After MC attempts to climb the stairs that lead to the attic and the source of the mysterious voice, that they keep hearing, Lucifer attempts to stop them and claims that it was no place for humans because it is dangerous. He later sends MC back to their room and further stresses that his words are law.

While MC and Leviathan have a competition about who is the biggest TSL fan, Leviathan loses control and attempts to attack MC while in his demon form. But Lucifer takes his demon form too and saves MC at the last minute, which is something his brothers say he hasn't done in a long time. He sends Leviathan back to his room to cool off. He later says it is his duty to clean his younger siblings' mess. Lucifer saving MC makes Mammon jealous.

After MC makes the pact with Leviathan, MC heads to Lucifer's room and hands him a copy of the TSL soundtrack that they had obtained from Leviathan. Lucifer is surprised and explains his interest in the soundtrack. He hints to MC that he would be listening to the soundtrack for the rest of the night but still reminds them not to go up the stairs to the attic. With Lucifer now distracted, MC makes their way to discover the identity of the person behind the mysterious voice.

Shortly after discovering Belphegor in the attic, and finding out about his true identity, MC eavesdrops on Lucifer and Beelzebub's discussion about Belphegor and his current position as an exchange student in the human world, with Beelzebub attempting to persuade Lucifer to allow him to come home. Lucifer asks Beelzebub who he would rather side with, between him and Belphegor. Mammon, also eavesdropping, tells MC that the brothers were once angels who resided in the Celestial Realm but it all changed after arriving in the Devildom. After pledging ultimate loyalty to Diavolo, Lucifer would follow his every command, at any cost.

After MC’s discussion with Beelzebub about his past, MC receives a call on their D.D.D. from Mammon, frantically asking that they make their way to the basement with haste as Lucifer is about to kill Luke due to his suspicion that Luke has intent to steal a Grimoire (a book important to the demons). He reveals his true form and goes to attack Luke and Beelzebub for harboring Luke without his permission, but MC steps in to protect them. Lucifer nearly kills MC but Diavolo stops him.

The next day, Lucifer invites MC to meet him in the music room before lessons start.

[Please note that this section only has information up to Lesson 6-12]

Trivia

 * His symbolic animal is a peacock, which symbolizes pride, beauty, and confidence.
 * The outfit he wears in his demon form pays homage to his animal, in that the fabric is patterned with peacock feathers
 * His dance battle stage animal is a bat. Bats are commonly associated with devils and darkness in Biblical tradition.
 * His name on Devilgram is "Lucifer." He is the only character who has his real name and not a nickname or pun.
 * His D.D.D's cover is black.
 * In the Christmas Event 2019, he gifted MC a rose from a completely new genus which he crossbred himself, using magic so that the rose won't wilt for a year.
 * In Chapter 20, if MC spends their last night in the Devildom with him, Lucifer tells them that unlike pacts with his brothers, making a pact with him means they belongs to him.
 * In the TSL fandom, the Lord of Corruption is based on him.
 * He's stated that his type is someone "pure, genuine, and worthy of respect", though he jokingly described a soul instead of a person.
 * According to Little D. No. 2, he's skilled at lifting curses. He's also talented in casting complex spells, as evident by being capable of locking Belphegor in the attic, making the room invisible to all demons, and casting a spell on the attic's stairwell that prevents demons from entering.
 * Lucifer is capable of resisting the effects of powerful potions, either due to his power as a demon or through sheer willpower.
 * He was able to maintain his self-control after eating a potion-laced cake that gave him animal traits and instincts (Paws and Claws).
 * In Lessons 21-22 when the brothers consumed gold hellfire newt syrup, he was able to suppress the effects long enough for MC to take care of his siblings first.
 * Lucifer loves classical music, especially in cursed formats, and often listens to them on records; in fact, that is his vice that MC was able to use that to distract Lucifer and make their way up to the attic.
 * The painting in his room was Simon Bisley's depiction of Lucifer falling from heaven. The painting changed to abstract in May 2020 because it's copyrighted.
 * Apparently, Lucifer is ambidextrous.
 * In the Official Opening Video he's holding a pen in his right hand.
 * In the The Fantastic Three's chat CG Evidence and in the skill animation for Big Brother Santa Claus, he's holding a pen in his left hand.

From Devilgram stories

 * As an angel, he once had six wings - this is mentioned by Satan in The Search for Self/Devilgram and also by Luke in the main story. He lost a pair of wings in the Great Celestial War.
 * From Satan's Be You Devilgram, Lucifer reveals that his greatest fear is dying and ascending to the Celestial Realm.
 * In his Seven Rulers of Hell Devilgram, it's revealed that he's very passionate about theatre and after a good play can't stop rambling and quoting his favourite parts even if his conversation partner doesn't share the excitement.