I love all of these boys and man do they all have amazing hair. These are my personal favorite colors on them.
Oldest to youngest:
JIN - PINK
I wish it lasted longer.
SUGA - BLOND
Easily my favorite color on my UB. Although black looks gorgeous on him too.
J-HOPE - RED
I f*cking loved this color on him.
RAP MONSTER - BLOND
Light brown is a really close second.
JIMIN - ORANGE
It looked so good with his skin tone.
V - PURPLE
JUNGKOOK - LIGHT BROWN
Though he hasn't had very much variation, light brown still tops it for me.