fairy godmother

noun2

1. •
   In certain fairy tales, a fictional benevolent woman with magical powers who uses them to help the cause of the protagonist.

   • I thought it was clever the director cast the same woman to play both the Wicked Witch and Prince Charming's fairy godmother.
2. •
   Any generous benefactor.

   • How lucky you are to have me for a friend! I am a fairy godmother to you! — 2007