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.

Archangel Michael
Vital statistics
Position Archangel
Species Angel
Age Immortal
Status Alive
Physical attributes
Height Unknown
Weight Unknown
Skin Color Unknown
Hair Color Unknown
Eye Color Unknown
Family Relationships
Mother Unknown
Father Unknown
Siblings Gabriel (Archangel brother)

Uriel (Archangel brother)

Raphael (Archangel brother)

Other Unknown