Answer:
I have green hair a round red head and a long thin white beard.
I am commonly abbreviated to H
I can be red blue purple and green. No one can reach me not even the queen.
I am seen in the water. If seen in the sky I am in the rainbow a jay's feather and lapis lazuli.
Draw fire or fill me; I'm still empty.
A town has only two barbers. One of the barbers has a nice, tidy haircut, and the other has a shaggy, messy haircut. Which barber should you go to?