'Mighty Angel' in the Bible

And to give relief to you who are suffering, as well as to us, at the Appearing of the Lord Jesus from Heaven with his mighty angels, 'in flaming fire.'

and I saw a mighty angel who was proclaiming in a loud voice-- 'Who is worthy to open the book and break its seals?'

Then I saw another mighty angel, descending from Heaven. His robe was a cloud; over his head was the rainbow; his face was like the sun, and his feet like pillars of fire;

Then a mighty angel took up a stone like a great millstone, and threw it into the sea, crying-- 'So shall Babylon, the Great City, be violently overthrown, never more to be seen.