'Mighty Angel' in the Bible

I saw a mighty angel proclaiming with a loud voice, "Who is worthy to open the scroll, and to break its seals?"

I saw another mighty angel coming down out of the sky, clothed with a cloud. A rainbow was on his head. His face was like the sun, and his feet like pillars of fire.

A mighty angel took up a stone like a great millstone and cast it into the sea, saying, "Thus with violence will Babylon, the great city, be thrown down, and will be found no more at all.