An angel is someone who brings out the angel in you. Choose to be an angel.

How do you go about bringing out the angel in others?  It sounds like a pretty challenging task.  It’s really not.  Be the best possible person you can be, and those around you will eventually do the same.  Think about it, when you are around people who are in a crappy mood, it tends to bring your mood down.  The same if you are around people who are happy, cheerful an upbeat.  So focus on you, be the best person you can be, and watch the change in those around you.