A new look at the White Horse

This white horse is the first of four horses of different colors, similar to the horses seen by Zechariah (Zec. 1:8; Zec. 6:2-6). See Zechariah’s Horses for a discussion of the relationship between Zechariah’s visions and the horsemen shown John. Within the context of the book of Revelation, white represents righteousness. “The white horse . . . emerges as an emblem of righteousness.”

he who sat on it
The similarities between this rider and Christ are striking:

1. Riding a White Horse - Both ride upon a white horse indicating victory (Rev. 6:2+; Rev. 19:11+).
2. Wearing a Crown - Both wear a crown (Rev. 6:2+; Rev. 19:12+). But Christ wears multiple crowns, so I don't see this rider being Jesus. Instead, a crown is a symbol of honor and of the power given Michael, "the great prince who stands guard over the sons of your people" as a triumphant culmination of an effort or endeavor, especially a prolonged one to watch over those written in the book of life.
3. Overcome - Both are “overcomers”—victorious in their pursuits (Rev. 6:2+; John 16:33; 1Jn. 4:4; Rev. 3:21+; Rev. 17:14+).

I believe the rider on the White Horse is Michael the Arch-Angel. We see in Daniel 12:1, "Now at that time Michael, the great prince who stands guard over the sons of your people, will arise. And there will be a time of distress such as never occurred since there was a nation until that time; and at that time your people, everyone who is found written in the book, will be rescued. This would also align with the next horse which is red that takes peace from the earth, to which sounds a lot like Satan cast to the earth after the war with Michael and his angels.

Revelation 12:7-9, sums it up: Now war arose in heaven, Michael and his angels fighting against the dragon. And the dragon and his angels fought back, but he was defeated, and there was no longer any place for them in heaven. And the great dragon was thrown down, that ancient serpent, who is called the devil and Satan, the deceiver of the whole world—he was thrown down to the earth, and his angels were thrown down with him.