St. Raphael is unique in that he is an angel who is a central character in a book of the Bible : The Book of Tobit. The structure of the story is fascinating because in it two or three stories are woven together to show that God sees how all things interconnect. All things converge. The book of Tobit weaves together several apparently unconnected stories: the blindness of Tobit in Nineveh and Sarah in Media whose prayers 'found favour with the Lord'. Raphael is despatched to cure - with the liver, heart and gall bladder of a fish- Tobit of his blindness and to rid Sarah of a troublesome devil (Asmodeus) who kills her husbands before their marriage can be consummated. He then ensures that Tobias ( Tobit's son) gets to marry Sarah, deals with the devil and then they all live happily ever after. In paintings (as right -> ) Tobias is often portrayed as carrying the fish whose internal organs were used to cure his father's blindness and scare off Asmodeus.
Lippi's picture (1485) showing all three Archangels with Tobias