Maybe he could inflict "lunacy" on people, which would be like the berserk and confusion status afflictions combined?
Hair like the moonlight, hmm... Well, the moon has great influence on the tides of water due to its gravitational pull. So he can have the power to manipulate water.
There is also the more basic route where he can blind enemies with the use of that hair. Think about super saiyan hair on steroids.
On the other hand, there is also the flip side of logic. Just go full-anime and have him be "connected" to the moon and be able to harness "the power of the moon". Insert any crazy idea you feel fit to represent the words in the quotes.
These are some of my ideas. xD Fun discussion dude.
That sounds cool. Go for it.