Michael

Name	Michael (Birth given name)
Actor
Dates	?
Location	Currently in Heaven
Occupation	High Ranking Archangel and a member of The Host of Heaven
Episode(s)

Michael is the greatest of the Archangels of Heaven equaled only by Lucifer. It was Michael who on God's Command threw Lucifer into Hell. His true Vessel is Dean. Castiel describes him as far more powerful than Raphael, which would make him tremendously powerful.

The Angels' plan was that Lucifer should be allowed to be freed and then Michael would use Dean as his Vessel and kill Lucifer once and for all.

In 5.10 Abandon All Hope Lucifer tells Sam that he had a brother who he loved and idolised called Michael. Lucifer asked Michael for help (against God's creation of humans) and that Michael turned on him, called him a freak because Lucifer was "different, because i had a mind of my own" and then beat Lucifer down. Very similar to Dean and Sam's story.

Michael is assumed to be one of the 5 things in all creation that the Colt cannot kill.

Michael was first mentioned in 2.13 Houses of the Holy, when Sam notices a painting of Michael killing Lucifer by the Renaissance painter Raphael in the church.

Father Reynolds: That's right. The archangel Michael, with the flaming sword. The fighter of demons, holy force against evil.
Sam: So they're not really the Hallmark card version that everybody thinks? They're fierce, right? Vigilant?

Father Reynolds: Well, I like to think of them as more loving than wrathful; but yes, a lot of Scripture paints angels as God's warriors. "An angel of the Lord appeared to them, the glory of the Lord shone down upon them, and they were terrified." Luke. Two nine.

Michael in lore

Michael is an archangel in Jewish, Christian and Islamic tradition. He is most known as a leader of the armies of God against Lucifer.