Overview
Michael Demiurgos is a fictional character primarily in the Lucifer series by DC comics, and is a creation of Neil Gaiman and John Bolton based on the archangel Michael, appearing on an early related series called The Sandman. As an archangel, Michael Demiurgos led God's forces against Lucifer during rebellion in Heaven.
Tom Ellis portrays Michael in the fifth season of the live-action Fox/Netflix series Lucifer, as the brother of Lucifer Morningstar.
Fictional character biography
When the Demiurgic Archangel Lucifer Morningstar began his revolt in Heaven, he was hopelessly outnumbered. He was eventually defeated by his brother the Demiurgic Archangel Michael who used the Demiurgos (God's power) to destroy his angelic forces. However, during the aftermath of the attack a fallen angel named Sandalphon thrust his spear into Michael's back and took him captive into a pocket reality. There Michael was chained to a very large pillar (his physical form at the time being very large) while Sandalphon attempted to create a new generation of warrior angels. All angels are sterile and thus their numbers are not easily repopulated. Using Michael's demiurge to impregnate human women and then gestating the fetuses inside Michael himself, he produced thousands of failures before creating Elaine Belloc with her 300 viable ova. Just as he attempted to claim Elaine, however, Lucifer stepped in.
Easily defeating the cowardly fallen angel Sandalphon, Lucifer took Michael – who never bore animosity towards his brother – and used him as a means to end the then-ongoing assault by the Heavenly Host against his home. Lucifer had obtained a Letter of Passage outside of Creation due to an earlier arrangement with Heaven. The subsequent doorway had been intended to be one-way and one-time only, but Lucifer bound it open with YHWH, God's own name. To destroy the door would be to unmake Creation.
From Wikipedia (CC BY-SA 4.0).