Jesus is the one with the sword in Revelation 19, not Michael. Neither of them are the first seal rider with the bow.
Michael is an ambassador of GOD. Jeremiah 49:v.14 and Obadiah 1:v.1
It is Michael who will cast both the Beast and the false prophet into the lake of fire - Revelation 19-. It is Michael who will cast the old Serpent, called the Devil and Satan, into the bottomless pit.
It is Michael who makes War against the red Dragon and his messengers (2Corinthians 11:v.13 to 15), which deceiveth the whole world.
It is Michael who sounds the last Trumpet , even the Lord Himself shall descend from heaven with a shout, with the voice of the archangel - Michael -, and with the trump of God: and the dead in Christ shall rise first. - Daniel 12:v.2 and 1 Thes.4:v.16. And because the presence of Michael there will be great tribulation from now on or in he days ahead.
Michael is the angel from whom GOD said unto Moses would go before him to keep him: Exodus 23:v.20-22
20 Behold, I send an Angel before thee, to keep thee in the way, and to bring thee into the place which I have prepared.
21 Beware of him, and obey his voice, provoke him not; for he will not pardon your transgressions: for my name is in him. (What's name was revealed to Moses? Exodus 3:v.15 - 15 And God said moreover unto Moses, Thus shalt thou say unto the children of Israel, the Lord God of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob, hath sent me unto you: this is my name for ever, and this is my memorial unto all generations.
22 But if thou shalt indeed obey his voice, and do all that I speak; then I will be an enemy unto thine enemies, and an adversary unto thine adversaries.
23 For mine Angel shall go before thee, and bring thee in unto the Amorites, and the Hittites, and the Perizzites, and the Canaanites, the Hivites, and the Jebusites: and I will cut them off.
See this testimony of Stephen: Acts 7:v.30-33
30 And when forty years were expired, there appeared to him -Moses- in the wilderness of mount Sina an angel of the Lord in a flame of fire in a bush. <--->Revelation 1:v.1 -
31 When Moses saw it, he wondered at the sight: and as he drew near to behold it, the voice of the Lord came unto him,
32 Saying, I am the God of thy fathers, the God of Abraham, and the God of Isaac, and the God of Jacob. Then Moses trembled, and durst not behold.
33 Then said the Lord to him, Put off thy shoes from thy feet: for the place where thou standest is holy ground.
Revelation 1:v.1 and 10-13
1 - The Revelation of Jesus Christ, which God gave unto him, to shew unto his servants things which must shortly come to pass; and he sent and signified it by his angel unto his servant John:
10 I was in the Spirit on the Lord's day, and heard behind me a great voice, as of a trumpet,
11 Saying, I am Alpha and Omega, the first and the last: and, What thou seest, write in a book, and send it unto the seven churches which are in Asia; unto Ephesus, and unto Smyrna, and unto Pergamos, and unto Thyatira, and unto Sardis, and unto Philadelphia, and unto Laodicea.
12 And I turned to see the voice that spake with me. And being turned, I saw seven golden candlesticks;
13 And in the midst of the seven candlesticks one like(similar) unto the Son of man, clothed with a garment down to the foot, and girt about the paps with a golden girdle.
I wrote the Scriptures above because by your own words see that you knew not (now you know him) the archangel Michael.
John thought even to worship Michael: Revelation 22:v.8-9
8 And I John saw these things, and heard them. And when I had heard and seen, I fell down to worship before the feet of the angel which shewed me these things.
9 Then saith he unto me, See thou do it not: for I am thy fellowservant, and of thy brethren the prophets, and of them which keep the sayings of this book: worship God.