true to (one's) colors

Unfailingly loyal. Don't worry, the enemy will not be able to sway Richard—he is true to his colors.

Name	Pronounced	Usage
Mikheil	-	Georgian
Delyth	-	Welsh
Wayan	-	Indonesian, Balinese
Liucija	LUW-tsi-yah	Lithuanian
Henrich	-	Slovak
Narses	-	Ancient Persian (Hellenized)