Michael

Michael is a high-ranking archangel in the Celestial Realm. He has not made an official appearance, but has been mentioned by numerous characters.

Appearance
Though Michael has not been given an official appearance, there have been mentions regarding how he looks. According to Satan, Michael's appearance is a complete opposite to Lucifer's. Luke also claims in the RAD newspaper that Michael has good fashion taste, particularly with accessories.

Personality
Michael is said to be "too upfront about his desires", causing him to place unreasonable responsibility onto those working under him. Despite the overworking and unreasonable demands, his subordinates seem to respect him greatly and view him as a good person.

Michael has an immense sweet tooth, and most mentions of him revolve around his desire for sweets. He has rather lavish and specific tastes, and is very eager to try Devildom sweets. Despite seeming to have a rather large appetite, he has no issue sparing food for others, having sent Simeon and Luke a package of Celestial Realm confections while they were in the Devildom.

Michael is said to be interested in astronomy, having taught Luke and Mammon about human world constellations.

According to Mammon, Michael is "weird".

In his one and only text chat, it is shown that Michael is calm yet stern when he is angry. He prefers to talk rather than use physical discipline, contrasting with Lucifer.

Story
Note: this section may include spoilers

Background
In Lesson 23-5, Barbatos mentions that Michael is the current leader of the Celestial Realm's legion of angels as well as the guardian angel of confectioners.

In Lesson 27-19, it is revealed by Asmo that Micheal used to teach Mammon, but didn't know how to deal with him. This led to Lucifer taking over. In Lesson 23-3, the brothers reveal that Michael had always admired and loved Lucifer.

Main Story
Michael loves sweets of all kinds, according to Luke in Lesson 5-12. However, according to Simeon in the chat Dinner, Michael is very particular when it come to his food.

In Lesson 49, Luke has said that Michael often stares at where the demon brother's pictures used to hang when they were angels. He claims that, although he never says anything, Michael misses the demon brothers dearly.

Relationships
Note: this section may include spoilers

Luke
Luke reports directly to Michael, despite a massive gap between the two's ranks. This is because, though Luke is the lowest rank of angel, Michael sees a lot of potential in Luke and the power of his protective blessings, and has taken Luke under his wing. Because Michael has such strong faith in Luke, Luke has grown extremely attached to Michael, even to the point of idolizing him. Luke always keeps Michael's interests in mind, learning to bake so he could satisfy Michael's sweet tooth and becoming extremely upset when others talk badly about Michael.

Simeon mentions that Michael specifically chose Luke for the exchange program because he felt that Luke needed the exposure to other worldviews the most.

Simeon
Simeon, like Luke, also works under Michael. Simeon does not idolize Michael in the way Luke does, but seems to respect him. Michael often makes Simeon run errands for Devildom sweets, much to Simeon's annoyance. When Lucifer remarked that it must be a nightmare to work under Michael due to his outrageous demands, Simeon sent a sticker of agreement but then specified that he's not a bad angel. Simeon seems to view Michael as a friend rather than just a superior; if MC points out that Simeon talks about Michael as though he were a regular angel, Simeon explains that this is because they have known each other for a long time.

Main Character
MC was supposed to meet with Michael at two points in the series- once when MC visited Luke and Simeon in the Celestial Realm, and again when MC is transported to a pre-war Celestial Realm and a past version of Lucifer attempts to push the responsibility for them onto Michael. However, in both instances, circumstances prevented the two from meeting. According to Luke before the former incident, Michael had been greatly looking forward to meeting MC.

However, despite never officially meeting, it appears that Michael knows MC on some level, as Raphael mentions in his introductory video that he has heard a lot about MC from Michael. The two may or may not have met when the Ring of Light was put on MC and MC communicated with an unknown person.

Raphael
Raphael also works under Michael, attending his needs closely. It is stated in his introductory video that Raphael greatly respects Michael. According to Belphegor, a large part of Raphael's sour atittude that the other brothers have complained about is due to the stress of attending Michael's needs, which tend to be difficult to fulfill with very little reward.

Lucifer
Michael and Lucifer had a close brotherly relationship back when Lucifer was an angel. They were described as being "like twins", and Mammon stated that the two were very similar to each other. Lucifer and Michael appeared to have a friendly sibling rivalry. The two would do things to mildly annoy each other, such as Lucifer making sure to attend the opening of the first planetarium in the Celestial Realm because he knew Michael had wanted to be there first. They also had a habit of pushing their responsibilities onto each other, with Lucifer referring a lost MC to Michael and Michael making Lucifer go to a diplomatic meeting in Devildom in his place.

However, the two have become estranged in the fallout of the Great Celestial War. Michael is responsible for causing Lucifer and his brothers to fall, though the details and motivations behind this are unknown. The two do not seem to have much contact with each other, and Lucifer's present-day feelings about Michael have not been explored. However, Michael's feelings about Lucifer are discussed by Luke in Lesson 49. According to Luke, Michael appears to be devastated by losing Lucifer and greatly regrets casting him down. Luke explains how Michael will wander down the halls of the Celestial Palace and stop where portraits of Lucifer and his brothers used to hang, and just stare. Luke's account of Michael's grieving is backed up towards the end of Season 3, when it is revealed that Michael has collected very important mementos from Lucifer's time in the Celestial Realm. He was very quick to discover when one of these keepsakes was stolen, implying he still keeps track of them closely after all these years.

Despite the obvious rift in their relationship, there does appear to be some healing. Lucifer mentions in the Devilgram A Job From Michael that Michael sent him unsolicited advice, and Lucifer actually followed through with Michael's advice throughout the Devilgram. Any resentment Lucifer may hold towards Michael due to the war has yet to be explored.

Mammon
Mammon formerly worked under Michael, but Michael found it too difficult to deal with Mammon's troublemaking behavior and gave him to Lucifer to handle. Before he was switched over to Lucifer, Mammon was taught about the constellations by Michael. However, Mammon does not remember what he was taught as well as he thinks he does. Mammon refers to Michael as "weird", saying he "could never forget someone as weird as him."