Michael, or known famously as the Archangel Michael, is an Angel of War. He is mentioned throughout the books but never appears in person as he is always away, supposedly fighting Heaven's battles.
At the end of End of Days, Raffe says that when the angels return, they should manage to "corral him eventually" and elect him as the new Messenger of God.
|Siblings|| Gabriel (Archangel brother)
Uriel (Archangel brother)
Raphael (Archangel brother)