In Christianity and Judaism, angels are the servants of God. They embody the ideals God hopes to invoke in his subjects (humans) and they act as messengers.
There are several famous angels, many of which are archangels. They are:
Gabriel - an archangel, believed to be the leader of all angels.
Raphael - a healer, called on when someone is sick or terminally ill.
Barchiel - dubbed as the "bringer of hope".
Michael - the warrior, who defends the heavens against demons.
Uriel - the archangel of Salvation.
Of course, different texts list different angels and their deeds. Have you seen any of these (or other famous angels) mentioned in paranormal romances?