There are five places where Michael is spoken of in the Bible.
Daniel 10:13, “But the prince of the kingdom of Persia withstood me one and twenty days: but, lo, Michael, one of the chief princes, came to help me; and I remained there with the kings of Persia.” Here Michael is recognized as one of the most chief of the angelic beings.
Daniel 10:21, “But I will shew thee that which is noted in the scripture of truth: and there is none that holds with me in these things, but Michael your prince.” Here the angel speaking to Daniel is bearing witness to the fact that none are more knowledgeable than Michael.
Daniel 12:1, “And at that time shall Michael stand up, the great prince which stands for the children of thy people: and there shall be a time of trouble, such as never was since there was a nation even to that same time: and at that time thy people shall be delivered, every one that shall be found written in the book.” Here we believe that the “children of thy people” is referring to the Jewish nation. At Jesus’s first advent, the disciples wondered about and expected this restoration of Israel. “When they therefore were come together, they asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel? And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power.” (Acts 1:6,7) Thus the disciples clearly understood that the Messiah (Jesus) would be the one who would re-establish the kingdom of Israel. Therefore, Daniel 12:1 and Acts 1:6 are referring the the same events, and Michael or Jesus is the one restoring Israel.
Jude 1:9, “Yet Michael the archangel, when contending with the devil he disputed about the body of Moses, durst not bring against him a railing accusation, but said, The Lord rebuke thee.” Obviously here, it is shown that the power of Michael is greater than that of the Devil, as it would seem that the Devil backed down from his intentions at the word of Michael.
Revelation 12:7, “And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels…” In this account in the book of Revelation, the impression you get is that of a war between good and evil taking place and the two protagonists are Michael and the dragon i.e. the Devil…
Consider also the meaning of the name, Michael. According to Strong’s Concordance, Michael (Strong’s word H4317) means “who (is) like God?”
When reviewing all the above scriptures and the very meaning of the name Michael, it seems reasonable that Michael is Jesus’s pre-human name.