Yes, "I am your little angel" can be a metaphor for someone who brings comfort, protection, or joy to another person, emphasizing a sense of care or innocence in the relationship.
Angel
a little angel
This is a metaphor, not an idiom. They are comparing that person to an angel, which is a supremely good being in religious lore.
Yes
The phrase "she is my guardian angel" is a metaphor. This is because it directly describes someone as having the qualities of a guardian angel without using "like" or "as" to make a comparison.
yes
metaphor
I have the face of an angel. You have the lip of a cup.
metaphor
Little Angel was created in 2007-03.
-Spread your wings my little butterfly (Metaphor) -Don't matter if I fall from the sky (Metaphor) -Like water off my wings (Simile)
The duration of Bad Little Angel is 1.2 hours.