Cerberus
Cerberus is a hellhound that lives in the House of Lamentation's underground tomb and only obeys Lucifer. He was first introduced in Lesson 8-10 of Obey Me!'s Main Story, and his name is likely a reference to the dog from Greek mythology.
Overview[edit]
Cerberus is a family pet of sorts, for it's seen in chat messages that Lucifer often takes him for a walk and cares for him, like a regular dog.(source?) Aside from Lucifer, most of the brothers aren't very fond of Cerberus and refuse to walk him.(source?) Beelzebub can be convinced to care for Cerberus with bribes from Lucifer, as seen in the chats Caring for Cerberus 1 and 2.
In Lesson 2-8 (NB), Beelzebub mentioned that Cerberus is legendary beast with a ferocious reputation, and even those in the Celestial Realm have heard of him.
While Cerberus's picture shows all three of his heads with fire coming from his mouths, fire-breathing is strangely not an ability that Cerberus has been mentioned to have.
In the Devilgram I Can Do It Too!, it is implied that Cerberus does not have to be fed every day, as Leviathan assumed that since Mammon was supposed to feed him the day before, he shouldn't be hungry the next day.
As seen in the event Happy Birthday! Dear Lucifer '21, Lucifer can summon Cerberus by using the incantation "Come forth, Cerberus!"
Cerberus is usually identified by his monstrous roar. However, in the Devilgram Caring For Lucifer's Dog, Cerberus was able to say "Ruff" like a normal dog when he was happy.
While Cerberus typically obeys Lucifer exclusively, Luke was able to pacify and bond with him in the Devilgrams I Can Do It Too! and Caring For Lucifer's Dog. Lucifer was impressed by this, and mentioned that it's rare for Cerberus to leave himself unguarded in front of anyone but himself.
Appearance[edit]

It is unknown if all hellhounds have multiple heads, but Cerberus does have three wolf-like heads. He's implied to be very large, as in Lesson 8-10 (OM), Beelzebub said he heard Cerberus growling from above Leviathan's head. His fur is shades of dark grey, and he has bright, fiery yellow eyes. The insides of his black ears are also fiery orange and yellow.
Story[edit]
Background[edit]
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Obey Me's Main Story and Events[edit]
In Lesson 8-10, during the retreat at the Demon Lord's Castle, MC, Mammon, Leviathan, and Beelzebub headed for Lucifer's room to take a picture of Lucifer's sleeping face. MC wanted said photo in order for Asmodeus to enter a pact with them. Upon entering the room, they encountered Cerberus, and found the way they came in locked. They escaped through another door, which teleported them to the castle's underground labyrinth. It was revealed that Lucifer placed a curse on his door that would transport anyone who didn't knock into Cerberus's domain.
When MC, Mammon, Leviathan, Satan, and Lucifer entered the game Dogi✩Maji✩Memorium, Cerberus served as the final boss, as seen in Lesson 10-17. However, he didn’t recognize Lucifer as his master. When he tried to attack Satan, Lucifer’s wrath comes forth and is able to dominate him in Lessons 10-17 and 10-19.
After the incident in Lesson 6 with Luke and the Grimoire, Lucifer had Cerberus patrol the House of Lamentation's underground tomb. This is a fact the other brothers and MC did not know when they tried to retrieve the grimoire in order to lure Lucifer out of being under house arrest in Lesson 14.
Cerberus made a small cameo in Happy Birthday! Dear Lucifer '21, where Lucifer summoned him to attack Mammon for an unpaid bill. According to Mammon, that was very extreme compared to the other times he was punished. However, Lucifer was on edge because he lost the necklace MC had gifted him from his last birthday.
Nightbringer's Main Story[edit]
In Lesson 2-8, Mammon and his younger brothers wanted to tame the legendary creature kept in the Demon Lord's Castle in order to earn the title "Rulers of the Underworld." They found out the creature's name was Cerberus, and he was locked away by a complex spell. Satan once read a book about the spell containing Cerberus, so he knew how to dispell it.
In Lesson 3-6, Leviathan discovered a magic door under the lake at the Demon Lord's Castle. After Satan dispelled the charm, the lake emptied, revealing a secret cavern. The brothers encountered Cerberus in Lesson 3-10 after making their way through several traps. Cerberus attacked, and Mammon threw himself in front of Cerberus to protect the others.
Lucifer came to their rescue in Lesson 3-13, where he commanded Cerberus to sit. Diavolo later explained that Cerberus only bows his head to someone he recognizes as his master. Because Cerberus hadn't had a master in a long time, and he didn't want to keep Cerberus cooped up, Diavolo asked Lucifer to adopt him. Lucifer and his brothers reluctantly accepted. However, in lesson 3-15, Lucifer admitted to MC that he had been hoping to have Cerberus as his pet for a while.