Lots of works include angels, but not always the same kind of angels. Often, a creator will try to put a unique spin on their angels. Angels in fiction tend, by default, to be of a vaguely Abrahamic nature and may or may not have big fluffy feathery wings or Holy Halos. They generally are found doing God's will as part of some sort of grand plan, helping mortals (sometimes incognito), or otherwise staying aligned with Good. Angelic names, by the way, traditionally end in "-el" (meaning "of God")